Author Topic: T3 -- fitting 10mm tappet lock nuts  (Read 599 times)

Offline Moto

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T3 -- fitting 10mm tappet lock nuts
« on: April 21, 2019, 08:15:28 AM »
Can I fit 10mm-hex nuts on my T3's tappet adjuster screws without creating a problem? I recall the nuts are 11mm.

With 10mm nuts I could use this Motion Pro tappet adjustment tool (they don't offer an 11mm version):



https://www.motionpro.com/product/08-0586

Using a different version for my Buccaneer 250 was a great help last night, and made me think one would be nice for the T3 (and also for my Griso 1100, which I recall has 10mm adjusters). That big knob -- along with the 12-point wrench that can easily be repositioned while the knob is held in place -- makes fine-tuning the gap a breeze.

Also, does anyone know the thread size of the T3's tappet screws?

Moto
« Last Edit: April 21, 2019, 08:41:55 AM by Moto »
1976 850-T3
2007 GRiSO 1100
2017 Italjet/SSR Buccaneer 250i

Offline canuck750

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #1 on: April 21, 2019, 08:52:47 AM »
Seems plausible.

I drop a box end wrench over the adjuster nut then clamp a tiny vice grip to the flats on the adjuster stud and with hand hold the vice grip while I turn the box end wrench. Not as elegant as the proper tool but it works for me.
1949 Guzzi Airone
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1973 Laverda SF1
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Offline Tom H

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #2 on: April 21, 2019, 10:39:54 AM »
Seems plausible.

I drop a box end wrench over the adjuster nut then clamp a tiny vice grip to the flats on the adjuster stud and with hand hold the vice grip while I turn the box end wrench. Not as elegant as the proper tool but it works for me.

This is how I have always done it as well.

Tom
2004 Cali EV Touring
1972 Eldo
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Offline guzzista

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #3 on: April 21, 2019, 10:41:30 AM »
 Size on tappet studs is 8x1mm. Guzzi went from a 13mm nut to  a lighter 11mm nut about T3 era. If that became a 10mm nut it would leave  only 1 mm of metal thickness. Unless it was made of some type of unobtanium ($$$/ Guzzi content) it would be weak IMHO.
1975 750S Tribute bike, 1994 Cali 1100, 2007 Ducati GT1000, 1983 SP1000

Offline Moto

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #4 on: April 21, 2019, 11:15:01 AM »
Size on tappet studs is 8x1mm. Guzzi went from a 13mm nut to  a lighter 11mm nut about T3 era. If that became a 10mm nut it would leave  only 1 mm of metal thickness. Unless it was made of some type of unobtanium ($$$/ Guzzi content) it would be weak IMHO.

Excellent points. I suppose then that the 10mm hex nuts on the Griso 1100 are mating with a smaller adjuster, maybe 6mm?

(That is, if I am right that those are 10mm nuts.)
1976 850-T3
2007 GRiSO 1100
2017 Italjet/SSR Buccaneer 250i

Offline Moto

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #5 on: April 21, 2019, 11:33:56 AM »
Never mind! I see from MG Cycle's listings that I am wrong, and that my Griso shares the same 11mm nuts as my T3.

Thanks, Guzzista.

Silly me.

Moto
1976 850-T3
2007 GRiSO 1100
2017 Italjet/SSR Buccaneer 250i

Offline Rich A

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #6 on: April 21, 2019, 12:48:52 PM »
I cut a groove in a 3/8" or so allen wrench (with a Dremel) to turn the adjuster. You can use it with a box end wrench on the nut.

Rich A

Online s1120

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #7 on: April 22, 2019, 07:17:09 AM »
I cut a groove in a 3/8" or so allen wrench (with a Dremel) to turn the adjuster. You can use it with a box end wrench on the nut.

Rich A

Even better is a round shank screwdriver, cut it shorter, and cut the grove in it... give you a nice handle to hold, turn.  I made one up years ago for a old car I had back in the day. Cant even remember why through the fog of time, but it worked well. its kinda like a slightly bigger tire valve core remover.
Paul B

Offline Moto

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #8 on: April 22, 2019, 11:43:57 AM »
Those are three excellent suggestions. I've used a needle-nose Vise Grip. But I'll either modify an Allen wrench or a round-shank screwdriver after I take another look at the actual motor.

Those Motion Pro tools are indispensable for the little Buccaneer, but Guzzis are a whole different story.

Thanks to all.

Moto

1976 850-T3
2007 GRiSO 1100
2017 Italjet/SSR Buccaneer 250i

Online n3303j

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #9 on: April 22, 2019, 07:31:35 PM »
I check the rocker clearance on my T3 once in a blue moon (maybe every 10K miles) just out of guilt. Has a bit over 90K miles so far (70K on Ghilardoni Cylinders and valve rebuild by Memphis Motor Works). Maybe every 20K miles I might have to touch up an exhaust valve by 0.001". For adjustmen's that infrequent ordinary wrenches prove quite sufficient.
'98 MG V11 EV
'96 URAL SPORTSMAN
'77 MG 850T3 FB

Offline John A

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #10 on: April 22, 2019, 07:41:06 PM »
I check the rocker clearance on my T3 once in a blue moon (maybe every 10K miles) just out of guilt.




That guilt motivates me to look after the poor things once every so often as well. :sad:
John
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Online n3303j

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #11 on: April 22, 2019, 08:39:38 PM »



That guilt motivates me to look after the poor things once every so often as well. :sad:
Most stable set of heads I have ever seen. So far the EV doesn't seem to be any less stable.
'98 MG V11 EV
'96 URAL SPORTSMAN
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Offline guzzista

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #12 on: April 30, 2019, 10:46:10 AM »
Found a tool similar to Motion Pro, but made for 11mm Guzzi tappet adjustment nuts. No affiliation

https://www.ebay.com/itm/Moto-Guzzi-Valve-Adjustment-Tool-850-1000-1100-Big-Blocks-NEW/142165705809?hash=item2119bc8451:g:9LMAAM
1975 750S Tribute bike, 1994 Cali 1100, 2007 Ducati GT1000, 1983 SP1000

Offline Moto

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #13 on: May 01, 2019, 01:43:56 PM »
Found a tool similar to Motion Pro, but made for 11mm Guzzi tappet adjustment nuts. No affiliation

https://www.ebay.com/itm/Moto-Guzzi-Valve-Adjustment-Tool-850-1000-1100-Big-Blocks-NEW/142165705809?hash=item2119bc8451:g:9LMAAM

Thanks for that! I found it too, on another web page that I decided looked fishy. But this one seems OK.

Moto
1976 850-T3
2007 GRiSO 1100
2017 Italjet/SSR Buccaneer 250i

Online larrys

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Re: T3 -- fitting 10mm tappet lock nuts
« Reply #14 on: May 01, 2019, 02:05:44 PM »
I use a baby (3" long) metric adjustable end wrench to hold the adjuster.
Larry
'95 Cal 1100
'68 Bonneville

 

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