Author Topic: ‘75 850T Newb Restoration Project  (Read 27143 times)

Offline shiskowd

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‘75 850T Newb Restoration Project
« on: August 20, 2019, 10:10:03 PM »
This thread is a continuation of https://wildguzzi.com/forum/index.php?topic=102337.0 where I was considering stepping into the water with a purchase of a ‘75 850T with questionable background.  Being new to Guzzi restoration I’ll need the wisdom of the forum members to guide me along!  To that end I’ll post sufficient details and pic’s to prompt feedback/suggestions.

Related photo album can be found here > https://www.flickr.com/photos/156837828@N02/albums/72157710433825932

20190819-DPS02779

Background

The bike has a questionable history as the previous owner who had done some work on the bike wasn’t in the picture.  I purchased from a bike performance bike shop owner who had stored the bike for some time (10+ years) and had little knowledge of the bikes history. The bike came with a few boxes of parts, manuals, Guzziology (1996 edition) and a series of parts invoices & work orders.  Odometer shows 44,000 miles.  Following is a summary of what I was able to knit together. 

1998_03   The previous owner acquires the bike.
1998_05   Parts invoice - clutch cable, tach cable, sump gasket
1998_05   Purchased used rear fender & tail light
1998_07   Metal Finishing shop work order to strip and polish 3 motorcycle parts (?)
1998_11   Parts invoice - exhaust valve (1), timing chain, fuel taps (2), footpeg rubber (all), front fork dampers, fork gaiters, splined hub (2mm splines)
2000_01   Work order to recover seat
2001_05   Work order - resleeve cylinders with iron liners, new rings and related gaskets
2001_06   Parts invoice - base gaskets

In addition to the above, the bike has a replacement 12mm Brembo master brake cylinder, replacement caliper (same as stock), steel braided hose and new clutch perch w/ lever, all installed.  All of these parts look brand new, no wear or road grime of any sort.  New right & left switch gear - the right side was installed and wired, left side (horn, turn signals) was in a box (original left switch gear removed).  Also new in a box is a Dyna III ignition kit (date code 0240?) w/ new coils and new ignition switch.  The tires look new, no wear with a date code that suggests 1997 (certainly pre 2000).  The oil in the sump is very clean.  There was a remnant of fuel in the tank - smells like turpentine.  No fuel lines exist, carbs must have been drained as the bowels/floats are very clean.

Given these bits of information, I theorize the bike hasn’t run since shortly after the cylinders were resleeved (2001).  There are some hand written notes about ignition timing tucked inside the manuals, perhaps owner experienced some trouble with the old points ignition system prompting the purchase of the electronic kit but never installed.  The switch gear was only ˝ completed, probably at the same time the front brake master cylinder & caliper was installed.  Bike wouldn’t be safely operated without the left switch gear completed.

Today I inspected the wiring for the right switch gear, installed a battery and traced voltage, confirming it was where it needed to be.  Turned on the ignition and thumbed the starter button - starter caught right away and spun the engine!

Quickly put on a compression tester - 120 psi on right side, 112 psi on left (this at 3,300 ft elevation).  Needs a leak down test, may wait until the engine is on the bench…

From what I learned from my first post, next to dealing with the original chrome cylinders, the rubber block timing chain tensioner needs to be upgraded.  No reference to a different or OEM tensioner in the parts that were purchased, even though there was a new timing chain purchased in 1998.  This bike is an early 850T, no oil filter.

Next Step??

Given all this… my newby formulated plan is to put the engine on a bench, look at the timing chain tensioner, ensure/clean out any rubber bits from oil hose/passages, adjust valves, perform leak down test.  Additionally, starter/alternator service with installation of the new ignition and related wiring clean up.  I can take the engine apart further - looking for your suggestions!
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Online Dave Swanson

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Re: ‘75 850T Newb Restoration Project
« Reply #1 on: August 25, 2019, 09:46:29 AM »
I agree with Les.  As long as you plan to have the engine on the bench for inspection, I would tear it down and have a look at the condition of the crank and journals.
Dave Swanson - Northern IL
1935 GTS
1968 V700
1973 V7 Sport
1974 Eldo
1974 Police Eldo
1976 Convert
1977 Lemans 1.2
1980 T3 California
1993 1000S - Sparklehorse
2004 V11S - Eraldo-ized
2016 Griso SE - Beetle-ized
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Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #2 on: August 25, 2019, 09:31:13 PM »
Beginning to slowly strip off bits, cataloging what needs to be repaired and what parts are needed. 



Today I drained the engine and transmission. Engine oil was moderately clean but THERE WAS NO OIL IN THE TRANSMISSION!  The transmission case threads for the drain plug are stripped and could barely hold the plug.  I'm really hoping the oil disappeared over the years this thing sat in storage...  Thinking a Timesert will be the answer to repair the case.  Judging by the depth of that plug there isn't too much material to work with.  Guzziology suggests this is a common problem and needs to be addressed for the level inspection plug threads as well.

« Last Edit: August 26, 2019, 07:31:49 AM by shiskowd »
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #3 on: September 01, 2019, 10:09:21 PM »
The disassembly has proceeded well enough and is complete.  Along the way learned a great deal about the bike through taking in apart and sifting through various WG forums and the plethora of resources on the web.





There are some obvious mounts for the coils and rectifier that were brazed on by a previous owner.  The brazing is awful, the rectifier brackets not even square to the frame.  I suspect the original brackets had failed requiring the brazing??  Plan is to grind these off prior to powder coating.  I have a set of Dyna coils and considering a modern rectifier/regulator that I need to figure out a mounting solution and weld on some tabs.



The pieces that mate the engine and transmission together look fine on initial inspection (odometer indicates 46,000 miles).





Before the weekend I was only able to pull the heads and cylinders.  Waiting for a few tools to disassemble further.

The rocker arm pin oil passages certainly had a far amount of what I believe has been described as small rubber bits from the suspected timing chain rubber tensioner.  Not enough bits to starve the oil entirely as the pin and related surfaces appear fine.  Do all the rings look like this under the rocker arm support??  I haven’t taken the front cover off the engine to see what remains of the timing chain tensioner or if it was retrofitted.



The bike had iron sleeves installed in the cylinders about 18 years ago but had run very little since that occurred (from what I could gather on the bikes history).  The cylinder bores are in very good shape, some cross hatching from a hone is still visible in the cylinders.  Pictures don’t capture this well but I included one below.  There are no visible vertical marks at all in both cylinders.  Similarly, both pistons are very clean with no signs of wear.  I’ll measure ring end gap at some point.





The cam tappers/lifters are in great shape as well.  I was fearing worse with an engine with this many miles with chrome cylinders for most of those miles (46K).  I’ll post more when I disassemble further.

Any comments or suggestions welcome!!
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Wildguzzi.com

Re: ‘75 850T Newb Restoration Project
« Reply #3 on: September 01, 2019, 10:09:21 PM »

Online Dave Swanson

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Re: ‘75 850T Newb Restoration Project
« Reply #4 on: September 02, 2019, 06:46:35 AM »

The rocker arm pin oil passages certainly had a far amount of what I believe has been described as small rubber bits from the suspected timing chain rubber tensioner.  Not enough bits to starve the oil entirely as the pin and related surfaces appear fine. Do all the rings look like this under the rocker arm support?? I haven’t taken the front cover off the engine to see what remains of the timing chain tensioner or if it was retrofitted.





Any comments or suggestions welcome!!

Good going so far!  Nothing alarming as of yet.   There should be o-rings under the rocker supports, not whatever that is! That is a bodge job of some sort, but if that is the worst of it things are going well.   
« Last Edit: September 02, 2019, 06:48:31 AM by Dave Swanson »
Dave Swanson - Northern IL
1935 GTS
1968 V700
1973 V7 Sport
1974 Eldo
1974 Police Eldo
1976 Convert
1977 Lemans 1.2
1980 T3 California
1993 1000S - Sparklehorse
2004 V11S - Eraldo-ized
2016 Griso SE - Beetle-ized
2021 V7-850 Stone Centenario
2022 V85TT Guardia d'Onore
2023 V100S

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Online Antietam Classic Cycle

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Re: ‘75 850T Newb Restoration Project
« Reply #5 on: September 02, 2019, 08:39:43 AM »
I would definitely not recommend reusing those Sureflex clutch plates. In my experience, they tend to be "grabby" and wear the clutch hub quickly.
Charlie

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #6 on: September 08, 2019, 12:30:03 AM »
My engine tools arrived this week from MG Cycle, spent a afternoon in the garage exploring...

I know little about the bikes history other than a few part/work order receipts I found tucked in a Guzziology manual (1st edition) that came with the bike.  Iron cylinder liners were installed in 2001, timing chain was purchased in 1998.  The tires on the bike have pre-2000 vintage date codes and show almost no wear suggesting the bike ran very little since the iron sleeves were installed.  However, I was concerned about the effects of chrome cylinder bits circulating in a non-oil filter engine in all the years previous to the cylinder work.

Fair amount of sludge settled on the sump.  The engine hasn't run for 12+ years so it had plenty of time to settle.


Timing cover off revealing the infamous rubber timing block chain tensioner. Obvious the the crankshaft sprocket nut was removed and installed with a chisel, likely for the timing chain replacement.


The little wear shown on the rubber block would suggest minimal running time since the new piece was installed.  Receipt suggests the timing chain was changed out in 1998, likely the tension block at the same time.


The bolt locking tabs for the tensioner were botched during the replacement.  The locking tabs for the front/small crank bearing look like they've never been moved.


Pistons show very little wear, certainly no scoring.


Need to measure the ring end gap and have someone with the right tools to measure the piston clearances.


The con rod half bearing shells look like this.  I'm new at this but I would say they're lightly scored.


The MG Cycle big bearing tool worked like a charm - bearing began to move with only light pressure.


The crankshaft journals are in great shape, no scoring at all (to my newbie eyes).


The big and small end bearing surfaces are fine, no visible scoring.  There are no grooves that you can feel running a finger nail across the surfaces.


The plug on the sludge trap was surprisingly easy to remove.  The aluminum plug had only very light punches that weren't at all as effective as Guzziology led me to believe - it's completely reusable. You can see the trap is maybe 1/3 full.  The stuff inside is a firm paste that readily sticks to a magnet.


The camshaft is also in fine condition.  The bearing surfaces are not scored and are smooth.  Lobe faces similar, the tappet/lifters were in nice shape as well.




The big end bearing surface doesn't have any obvious scoring - there are very fine grooves (scratches?) in places that are not deep at all.  Not sure if this is a concern.  I'll have my crankshaft guy measure the bearing clearances.  All of the measurements with my cheap micrometer suggest the big/small bearings and rod journals are standard size.




Oil pump looked good, no visible marks in the aluminum housing and the 'gears' have no chipping or other marks.


The clutch disks had a fair amount of oil on them - I would assume this is not a good thing.



 Looks like the main big seal or one of the gaskets in the bell housing was leaking.


I'm going to take the bits to Jim Carey's (canuck750) crank guy in Edmonton for a going over and to see if new bearings are in order and what size.  When Jim gets back from his trip to Europe he offered his vapor blasting services.

As always, comments and suggestions are welcome  :thumb:!!
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

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Re: ‘75 850T Newb Restoration Project
« Reply #7 on: September 08, 2019, 01:53:41 AM »
Looking good! Nice to have iron cylinders and the bored look good.

Online Dave Swanson

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Re: ‘75 850T Newb Restoration Project
« Reply #8 on: September 08, 2019, 09:05:27 AM »
Quite encouraging so far.  Nothing too far amiss.  I am going to guess that the crank and bearings are within spec.  The light scoring is normal especially without an oil filter. 

The clutch plates should be replaced.  Using brake cleaner will not be as effective as buying new plates, and not healthy to breathe.

Good going!
« Last Edit: September 08, 2019, 09:06:15 AM by Dave Swanson »
Dave Swanson - Northern IL
1935 GTS
1968 V700
1973 V7 Sport
1974 Eldo
1974 Police Eldo
1976 Convert
1977 Lemans 1.2
1980 T3 California
1993 1000S - Sparklehorse
2004 V11S - Eraldo-ized
2016 Griso SE - Beetle-ized
2021 V7-850 Stone Centenario
2022 V85TT Guardia d'Onore
2023 V100S

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Online Antietam Classic Cycle

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Re: ‘75 850T Newb Restoration Project
« Reply #9 on: September 08, 2019, 05:06:33 PM »
Like I wrote above, I wouldn't reuse those Sureflex clutch plates, even if they weren't oil soaked.
Charlie

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #10 on: September 08, 2019, 07:21:14 PM »
Like I wrote above, I wouldn't reuse those Sureflex clutch plates, even if they weren't oil soaked.

Which clutch plates would you suggest?  Is it a good idea to upgrade to the 4mm spline??
'14 KTM 500 EXC
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'75 Moto Guzzi 850T

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Re: ‘75 850T Newb Restoration Project
« Reply #11 on: September 08, 2019, 08:22:53 PM »
Which clutch plates would you suggest?  Is it a good idea to upgrade to the 4mm spline??

http://www.mgcycle.com/index.php?main_page=product_info&cPath=193&products_id=1165

Yes, it is a good idea.
Charlie

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #12 on: September 10, 2019, 10:16:50 PM »
I was cleaning off the old gasket from the oil screen pickup assembly and noticed a crack on the mounting flange.  Concern wouldn't be a leak but having the part fail, interrupting oil flow and fall into the spinning crank.  Seeking a used part of perhaps an oil pan with a filter and perform the required case mods with a new front crank bearing.



'14 KTM 500 EXC
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Online Dave Swanson

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Re: ‘75 850T Newb Restoration Project
« Reply #13 on: September 11, 2019, 05:59:05 PM »
I certainly would not install that.

Here is the whole 9 yards off of a 850T on eBay for $49 plus shipping.

https://www.ebay.com/itm/1975-MOTO-GUZZI-850-T-850T-Oil-Pump-With-Pick-Up-Screen/362421421029?hash=item54620003e5:g:up8AAOSwtE9bgJrw:sc:USPSPriority!61107!US!-1

Here is just the piece that you need.  I am not sure if it is exactly the same as 850T without some research.  Maybe Charlie will chime in.   Just $17

https://www.ebay.com/itm/1967-69-Moto-Guzzi-V7-700-V700-OEM-OIL-PUMP-PICK-UP-WITH-SCREEN/312432111435?hash=item48be67af4b:g:jLIAAOSwUWtcQLU3

Dave Swanson - Northern IL
1935 GTS
1968 V700
1973 V7 Sport
1974 Eldo
1974 Police Eldo
1976 Convert
1977 Lemans 1.2
1980 T3 California
1993 1000S - Sparklehorse
2004 V11S - Eraldo-ized
2016 Griso SE - Beetle-ized
2021 V7-850 Stone Centenario
2022 V85TT Guardia d'Onore
2023 V100S

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Online Dave Swanson

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Re: ‘75 850T Newb Restoration Project
« Reply #14 on: September 11, 2019, 08:24:44 PM »
Grab the 2nd one for $17 and free shipping.  I talked to Charlie, he says all non oil filter models use the same pick up housing. 

https://www.ebay.com/itm/1967-69-Moto-Guzzi-V7-700-V700-OEM-OIL-PUMP-PICK-UP-WITH-SCREEN/312432111435?hash=item48be67af4b:g:jLIAAOSwUWtcQLU3
Dave Swanson - Northern IL
1935 GTS
1968 V700
1973 V7 Sport
1974 Eldo
1974 Police Eldo
1976 Convert
1977 Lemans 1.2
1980 T3 California
1993 1000S - Sparklehorse
2004 V11S - Eraldo-ized
2016 Griso SE - Beetle-ized
2021 V7-850 Stone Centenario
2022 V85TT Guardia d'Onore
2023 V100S

MGNOC L-780

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #15 on: September 11, 2019, 09:50:33 PM »
2nd Ebay part ordered!

Thanks Dave & Charlie  :azn:
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Offline Chuck in Indiana

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Re: ‘75 850T Newb Restoration Project
« Reply #16 on: September 12, 2019, 09:36:04 AM »
Gotta love WG.. :smiley:
Chuck in (Elwood) Indiana/sometimes SoCal
 
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Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #17 on: September 16, 2019, 09:11:46 PM »
Another day, another part to source/purchase...

I posted here my concerns about the iron sleeves that were installed in the cylinders > https://wildguzzi.com/forum/index.php?topic=102720.0 and my decision to purchase a Gilardoni cylinder kit.  I didn't need the kit just yet but Rick at MG Cycle suggested that I pick up a kit somewhere (they were out of stock) as he felt those may be hard to come by as the manufacture seems not as interested to produce them any longer due to dwindling demand (how many chrome cylinders are out there?).  I have a kit on the way from Scrambler Cycle.

As I continue to clean up the engine pieces prior to vapor blasting I noticed the cracked oil pickup (see earlier post) and just this weekend I cleaned up the heads and noticed a bunch of fins missing off the left head.  Clearly something only a newb like me could have missed by now, having wrenched the part off earlier and taken a bunch of photo's....



While I'm sure the engine would be just fine without those few fins for cooling (this is Canada after all) my OCD kicked in and I found a cheap, clean looking head on Ebay ($100US + shipping to Canada $$$) here >  https://www.ebay.ca/itm/192975636353.

Engine ready for Jim's (canuck750) vapor blasting services when he returns from his excellent European riding adventure.  Crank inspection and head work (valves, springs, guides, etc.) will follow.

'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Online Dave Swanson

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Re: ‘75 850T Newb Restoration Project
« Reply #18 on: September 17, 2019, 05:35:43 AM »
Too bad about the cylinders, but glad you found a set.
Dave Swanson - Northern IL
1935 GTS
1968 V700
1973 V7 Sport
1974 Eldo
1974 Police Eldo
1976 Convert
1977 Lemans 1.2
1980 T3 California
1993 1000S - Sparklehorse
2004 V11S - Eraldo-ized
2016 Griso SE - Beetle-ized
2021 V7-850 Stone Centenario
2022 V85TT Guardia d'Onore
2023 V100S

MGNOC L-780

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #19 on: September 17, 2019, 11:13:59 PM »
Thanks LesP - learning something here. I'll check out that FB site once I get registered.

I haven't bought any valves, springs, guides yet - are the Kibblewhite bits worth the premium?
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

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Re: ‘75 850T Newb Restoration Project
« Reply #20 on: September 20, 2019, 04:36:20 PM »
Another day, another part to source/purchase...

I posted here my concerns about the iron sleeves that were installed in the cylinders > https://wildguzzi.com/forum/index.php?topic=102720.0 and my decision to purchase a Gilardoni cylinder kit.  I didn't need the kit just yet but Rick at MG Cycle suggested that I pick up a kit somewhere (they were out of stock) as he felt those may be hard to come by as the manufacture seems not as interested to produce them any longer due to dwindling demand (how many chrome cylinders are out there?).  I have a kit on the way from Scrambler Cycle.



Good thing you got the Gilardonis when you did.  Scrambler is now sold out. 
« Last Edit: September 21, 2019, 07:40:14 AM by Dave Swanson »
Dave Swanson - Northern IL
1935 GTS
1968 V700
1973 V7 Sport
1974 Eldo
1974 Police Eldo
1976 Convert
1977 Lemans 1.2
1980 T3 California
1993 1000S - Sparklehorse
2004 V11S - Eraldo-ized
2016 Griso SE - Beetle-ized
2021 V7-850 Stone Centenario
2022 V85TT Guardia d'Onore
2023 V100S

MGNOC L-780

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #21 on: September 20, 2019, 10:57:44 PM »
On to the transmission...

My only insight into the health of the transmission was it seemed to shift through all 5 gears on the center stand.  The drain plug is stripped and needs a time-sert or helicoil so at the minimum I need to pull it apart for that repair.  Also want the case vapor blasted to match the engine which require full disassembly.

John Nobles transmission guide is extremely useful for a newb > http://www.thisoldtractor.com/guzzitech.dk/pdf/gearbox-rebuilding-john-noble.pdf



Bearings all run smoothly.  No scoring on any of the race surfaces.



The output shaft took some pretty solid wacks with a rubber mallet to slip off the bearing.  The input shaft won't move at all with similar wacking.  I turned the case upside down, blocking it so shaft had room to drop.  Wouldn't move off the bearing and I didn't want to damage the bearing in the process.  Is it necessary to pull/replace the bearings in the case for a thorough vapor blasting on the outside of the case?  I really don't want to drive out and replace the bearings... :huh:



The forks and shift dogs show very little wear.









To my newby eyes things look pretty good, no noticeable wearing.  If it wasn't for vapor blasting I could install a new seal/gasket kit and tighten it all up (after repairing the drain hole threads).  Anything else I should look at/consider while I have it apart??
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Offline 1down5up

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Re: ‘75 850T Newb Restoration Project
« Reply #22 on: September 21, 2019, 02:00:11 AM »
You can blast it with the bearings left in, put the rear cover back on with a gasket, and make some round covers out of plywood for the input, output, neutral, and gear holes, stick some M10 bolts in the Breather, shift pawl and detant holes with washers and put the fill plug back in with a washer.

Then be studious with the cleaning, multiple times with hot soapy water and I like to flush out the bearings with brake cleaner a few times prior to putting oil back over them. If your good with the sealing there won't be any grit in there anyway, it will just help you sleep better....

That being said, some of the bearings are very cheep, I normally get the input and output bearings for under $15aud each, the needle roller and the 3 piece barrel bearing are somewhat more expensive......
« Last Edit: September 21, 2019, 02:04:03 AM by 1down5up »

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Re: ‘75 850T Newb Restoration Project
« Reply #23 on: September 21, 2019, 11:51:19 AM »
It's really not that hard to remove the bearings - heat the case and they usually fall out. Same with reinstalling - chill the bearing, heat the case, they drop right in.

Re: not being able to remove the input shaft: did you remove the two o-rings on the outside?

I'd definitely recommend replacing the shift return spring.

That being said, some of the bearings are very cheep, I normally get the input and output bearings for under $15aud each, the needle roller and the 3 piece barrel bearing are somewhat more expensive......

I wish we could find the (28 ball, metal cage) bearings here that inexpensively.
Charlie

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #24 on: September 21, 2019, 11:23:28 PM »
To Charlie's point I couldn't find an o-ring, only a sealant of some sort mixed in with what may have been an o-ring at one time. I dug as much of it out as I was able and with renewed confidence I took a slightly larger soft hammer and managed to drive the input shaft free of the bearing. There was one o-ring that was intact that I can see now that the shaft is off.



I'll start hunting around for the 6 bearings that are needed - best to take them out and thoroughly clean/blast as suggested.

With the 20 year old tires removed off the rims I've reaching the end of the disassembly process for the entire bike.  Only the wheels and rear drive remain intact - undecided if I should strip the rear drive.  The seals are good, pinion gear looks fine as does the bearings in the pinion housing.  I imagine you could vapor blast the rear drive with a cover where the pinion gear sits.



The hubs and rims need some cleaning.  There are some good suggestions in other posts I've found on cleaning these up - not adverse to stripping and re-lacing the wheels which looks like may be necessary.  Vapor blasting the hubs may in the end be the most efficient process.







'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #25 on: September 22, 2019, 10:24:43 AM »
Before I did anything to the fuel tank I wanted to test it's integrity.  The tank had some fuel in it when I purchased it, likely decades old.  I drained the old fuel (looked like kerosene) and poured in 5 liters of fresh premium.  For the next month I would give it a good swish every few days and position the tank so the fuel was resting in different parts of the tank.  No leaks or sweating that I could see.  The flaking paint around the fuel taps was likely due to the petcocks connections sweating over the years.

I think it's safe to strip the old paint and get it refinished.

How does one remove the tank emblems?  Do they snap in place?  They're in pretty good condition and I don't want to damage them - maybe it's unavoidable.



« Last Edit: October 06, 2019, 02:27:48 PM by shiskowd »
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Online Dave Swanson

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Re: ‘75 850T Newb Restoration Project
« Reply #26 on: September 22, 2019, 12:24:37 PM »
Dave Swanson - Northern IL
1935 GTS
1968 V700
1973 V7 Sport
1974 Eldo
1974 Police Eldo
1976 Convert
1977 Lemans 1.2
1980 T3 California
1993 1000S - Sparklehorse
2004 V11S - Eraldo-ized
2016 Griso SE - Beetle-ized
2021 V7-850 Stone Centenario
2022 V85TT Guardia d'Onore
2023 V100S

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Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #27 on: September 25, 2019, 11:26:50 PM »
'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Offline shiskowd

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Re: ‘75 850T Newb Restoration Project
« Reply #28 on: September 25, 2019, 11:35:34 PM »
Put the wheels on a truing stand tonight.  The back wheel runs pretty true, no radial run out at all.  Condition of the rim is decent and should clean up good enough with a complete disassembly.

The front wheel must have taken a hard pot hole or curb somewhere in the past.  There is a 3mm radial flat spot and a slight twist (one side isn't run out as much).  There are a few other spots where there is a lesser bump and wobble.  The rim itself isn't too scratched up and could be cleaned up to look good.  Not sure if I'd be able to straighten it out though.  Where does one find replacement Borrani wheels on this side of the pound?



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'14 KTM 500 EXC
'10 KTM 690R Rally
'75 Moto Guzzi 850T

Online Antietam Classic Cycle

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Re: ‘75 850T Newb Restoration Project
« Reply #29 on: September 26, 2019, 08:38:41 AM »
You could always have it straightened by Woody's: https://woodyswheelworks.com/pages/alloy-motorcycle-wheel-repair
Charlie

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