Author Topic: Opening Rear Drive  (Read 373 times)

Online Scout63

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Opening Rear Drive
« on: October 26, 2021, 03:59:38 PM »
I need to open up my G5 rear drive to chase down an oil leak.  Iíve replaced the big outer oil seal (PN 45) and this didnít fix it. Iím guessing I need to replace the smaller inner oil seal (PN 25).  Iíve tried to remove the cover (PN 41) after removing the bolts and washers and using some heat and fearful prying. but it isnít budging.  Any tricks?

Thanks,  Ben



Ben Zehnder
Orleans, MA USA
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Online Antietam Classic Cycle

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Re: Opening Rear Drive
« Reply #1 on: October 26, 2021, 04:05:29 PM »
I use a medium sized three-legged puller, with the jaws reversed (hooks pointed outward) to catch the bottom of the splines.
Charlie

Online Scout63

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Re: Opening Rear Drive
« Reply #2 on: October 26, 2021, 04:41:27 PM »
Thanks Charlie.
Ben Zehnder
Orleans, MA USA
1971 BMW R75/5
1972 Norton Commando Combat Interstate
1977 BMW R100S - next up to unload
1978 Yamaha SR500
1979 Moto Guzzi V1000G5 - T3FB mild custom
1979 Moto Guzzi V1000SP
1980 Moto Guzzi v50ii

Offline guzziart

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Re: Opening Rear Drive
« Reply #3 on: October 28, 2021, 07:13:08 AM »
Hey Scout,

FWIW, if you're digging back into your rear drive, you may want to check the overall condition of the "shim" #43.  I had been chasing a seep/leak on my LMIV when I finally determined that rust of the steel shim could be my problem.  The corrosion had eroded enough material that had resulted in a pathway of sorts for drive oil to leak out.  As I recall, I got a new shim through Harpers (no connection to seller), it was lightly oiled in a sealed Moto Guzzi baggie....no rust.  That was about 10 years ago and it hasn't leaked since. 

Art

Wildgoose Chase Moto Guzzi

Re: Opening Rear Drive
« Reply #3 on: October 28, 2021, 07:13:08 AM »

Online Scout63

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Re: Opening Rear Drive
« Reply #4 on: October 28, 2021, 09:01:02 AM »
Thanks Art. Iíll check the shim carefully. I really donít want to go back in there more than once.
Ben Zehnder
Orleans, MA USA
1971 BMW R75/5
1972 Norton Commando Combat Interstate
1977 BMW R100S - next up to unload
1978 Yamaha SR500
1979 Moto Guzzi V1000G5 - T3FB mild custom
1979 Moto Guzzi V1000SP
1980 Moto Guzzi v50ii

Online John A

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Re: Opening Rear Drive
« Reply #5 on: October 28, 2021, 10:16:12 AM »
I try not to disturb that shim pack and put it back exactly the way it was. If you do separate it, just makes sure it is the same thickness, same thickness shims and gaskets
John
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It is easier to fool people than it is to convince them that they have been fooled-Mark Twain

Online Scout63

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Re: Opening Rear Drive
« Reply #6 on: October 28, 2021, 05:19:20 PM »
John - does this mean do not replace the paper gaskets on either side of the shim and to reuse them?  Ben
Ben Zehnder
Orleans, MA USA
1971 BMW R75/5
1972 Norton Commando Combat Interstate
1977 BMW R100S - next up to unload
1978 Yamaha SR500
1979 Moto Guzzi V1000G5 - T3FB mild custom
1979 Moto Guzzi V1000SP
1980 Moto Guzzi v50ii

Offline guzziart

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Re: Opening Rear Drive
« Reply #7 on: October 28, 2021, 06:31:11 PM »
Hey Scout,

FWIW, if you're digging back into your rear drive, you may want to check the overall condition of the "shim" #43.  I had been chasing a seep/leak on my LMIV when I finally determined that rust of the steel shim could be my problem.  The corrosion had eroded enough material that had resulted in a pathway of sorts for drive oil to leak out.  As I recall, I got a new shim through Harpers (no connection to seller), it was lightly oiled in a sealed Moto Guzzi baggie....no rust.  That was about 10 years ago and it hasn't leaked since. 

Art


When I replaced the shim (#43), I replaced it with one having the same exact thickness.  Also, even though the paper gaskets were "new" they had still been used once so I replaced them aswell because I didn't want to go in there again (plus, they're inexpensive) and there was no additional shipping charge for the gaskets being shipped to me with the shim.
« Last Edit: October 28, 2021, 06:32:49 PM by guzziart »

Online John A

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Re: Opening Rear Drive
« Reply #8 on: October 29, 2021, 01:35:18 PM »
John - does this mean do not replace the paper gaskets on either side of the shim and to reuse them?  Ben


Depends on how they come apart, some will stick together with no sign of leakage and just need to be degreased on both contact surfaces and on those I use Locktite 516 flange sealant or similar. Not silicone, preference personal . If they are not about perfect, you are committed to replacing them. Some are shimmed with more than two gaskets and those usually stay together so if they are in good shape, I leave them. It depends on what it looks like when you get it apart.
John
MGNOC L-471
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Online John A

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Re: Opening Rear Drive
« Reply #9 on: October 30, 2021, 06:07:56 AM »
http://www.thisoldtractor.com/moto_guzzi_loopframe_rear_drive___bevel_box_rebuilds.html
Here is a link to rear drive box page from Greg Benders site. Check especially Pete Ropers writings there
John
MGNOC L-471
It is easier to fool people than it is to convince them that they have been fooled-Mark Twain

Online Scout63

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Re: Opening Rear Drive
« Reply #10 on: October 30, 2021, 06:23:19 AM »
http://www.thisoldtractor.com/moto_guzzi_loopframe_rear_drive___bevel_box_rebuilds.html
Here is a link to rear drive box page from Greg Benders site. Check especially Pete Ropers writings there

Thanks John:

I think Iíll pull the wheel today and take a look.
Ben Zehnder
Orleans, MA USA
1971 BMW R75/5
1972 Norton Commando Combat Interstate
1977 BMW R100S - next up to unload
1978 Yamaha SR500
1979 Moto Guzzi V1000G5 - T3FB mild custom
1979 Moto Guzzi V1000SP
1980 Moto Guzzi v50ii

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