Author Topic: Free Rear Main Seal Installer  (Read 408 times)

Offline neetones

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Free Rear Main Seal Installer
« on: January 13, 2026, 01:56:14 PM »
Hi all.

I just designed a 3d-printed version of the Rear Main Seal Installer. Cost me about 2 hours and $1.50 in PETG.

Hope you find it useful. Sounds better than spending $60.





https://makerworld.com/en/models/2241622-moto-guzzi-rear-main-seal-installing-tool#profileId-2440099

Nitin
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Online johnwesley

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Re: Free Rear Main Seal Installer
« Reply #1 on: January 13, 2026, 02:38:02 PM »
I just bought the 60-dollar one last week; this would have been a blessing. I'm sure someone will need it. That's pretty cool of you to offer it for shipping  :thumb:
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Online Antietam Classic Cycle

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Re: Free Rear Main Seal Installer
« Reply #2 on: January 13, 2026, 02:53:37 PM »
Had one and sold it, never used it. Drive seals in with a big socket instead.
Charlie

Offline n3303j

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Re: Free Rear Main Seal Installer
« Reply #3 on: January 13, 2026, 03:37:18 PM »
I spun one up on my 100 year old lathe from a chunk of left over 6061 bar stock. Of course the lathe was only 94 years old then.
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Online DoubleGuzzi

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Re: Free Rear Main Seal Installer
« Reply #4 on: January 13, 2026, 04:12:30 PM »
Love it when people make their 3D printed creations available to others. It's far more accessible to create space for an albeit large printer, extracted from a basement/attic, than say a lathe. :wink:
Hopefully, I'll never need to use a main seal driver but low cost 3D printed Triumph throttle slop reducers are a godsend. Another bloke released a Speed 400 tail tidy produced from 3D printed sections. Looks better than the cheapo Ali one that I bought for the missus,that wasn't even designed/made properly.
Got plans to craft a clutch centering tool?  :laugh:

Well done on your creation and sharing.  :thumb:
Nearly natural progression..
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Offline blu guzz

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Re: Free Rear Main Seal Installer
« Reply #5 on: January 13, 2026, 05:14:00 PM »
Our library has a "maker space" with 3d printing.  Anyone thinking about something like this should check their library.
Blue Guzz

Offline red stripeguz

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Re: Free Rear Main Seal Installer
« Reply #6 on: January 14, 2026, 07:33:55 AM »
Love it when people make their 3D printed creations available to others. It's far more accessible to create space for an albeit large printer, extracted from a basement/attic, than say a lathe. :wink:
Hopefully, I'll never need to use a main seal driver but low cost 3D printed Triumph throttle slop reducers are a godsend. Another bloke released a Speed 400 tail tidy produced from 3D printed sections. Looks better than the cheapo Ali one that I bought for the missus,that wasn't even designed/made properly.
Got plans to craft a clutch centering tool?  :laugh:

Well done on your creation and sharing.  :thumb:

https://makerworld.com/en/models/787825-clutch-centering-moto-guzzi?from=search#profileId-779066

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Online DoubleGuzzi

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Re: Free Rear Main Seal Installer
« Reply #7 on: January 14, 2026, 08:08:45 AM »
says "vintage large series"
Any requirement for us small block fans?
Nearly natural progression..
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Offline Moparnut72

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Re: Free Rear Main Seal Installer
« Reply #8 on: January 14, 2026, 08:32:32 AM »
https://makerworld.com/en/models/787825-clutch-centering-moto-guzzi?from=search#profileId-779066

says "vintage large series"

I have one that I bought to install the clutch on my semi basket case T3. It is available for loan, just pay shipping and a guarantee it finds its way home. I didn't want to pull the one off the transmission.
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Offline guzzisteve

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Re: Free Rear Main Seal Installer
« Reply #9 on: January 14, 2026, 08:50:57 AM »
A machinist friend of mine borrowed one from Joe Eisch to do his and copied it for more & I got one.
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Offline neetones

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Re: Free Rear Main Seal Installer
« Reply #10 on: January 14, 2026, 09:08:47 AM »
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Online Tom H

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Re: Free Rear Main Seal Installer
« Reply #11 on: January 14, 2026, 12:05:46 PM »
The clutch centering tool, I can't tell in the picture if it's deep (SD Tech and the like) or shallow spline (original for Loops for instance)?

Tom
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Online Antietam Classic Cycle

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Re: Free Rear Main Seal Installer
« Reply #12 on: January 14, 2026, 12:29:51 PM »
The clutch centering tool, I can't tell in the picture if it's deep (SD Tech and the like) or shallow spline (original for Loops for instance)?

Tom

Looks like it's for shallow splines to me.
Charlie

Offline guzziart

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Re: Free Rear Main Seal Installer
« Reply #13 on: January 15, 2026, 07:20:10 AM »
A machinist friend of mine borrowed one from Joe Eisch to do his and copied it for more & I got one.
Same here, borrowed one from Eish and then mailed it back but didn't have the brains to have it duplicated in case I might ever need one again.  However, necessity is the mother of invention so if Charlie says he taps them in with a hammer, I'd be emboldened to do the same especially since I don't have a socket that big to use as a driver.
Art
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Offline TN Mark

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Re: Free Rear Main Seal Installer
« Reply #14 on: January 15, 2026, 07:48:05 AM »
Hi all.

I just designed a 3d-printed version of the Rear Main Seal Installer. Cost me about 2 hours and $1.50 in PETG.

Hope you find it useful. Sounds better than spending $60.





https://makerworld.com/en/models/2241622-moto-guzzi-rear-main-seal-installing-tool#profileId-2440099

Nitin

Love it, love it, love it!
I’ve never 3D printed anything but I’ve seen the process many times.
I followed your link and it looks like the Okan’s to make one are their.
If you would make them and sell them, count me in.

Online Antietam Classic Cycle

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Re: Free Rear Main Seal Installer
« Reply #15 on: January 15, 2026, 08:23:53 AM »
Same here, borrowed one from Eish and then mailed it back but didn't have the brains to have it duplicated in case I might ever need one again.  However, necessity is the mother of invention so if Charlie says he taps them in with a hammer, I'd be emboldened to do the same especially since I don't have a socket that big to use as a driver.
Art

I do not "tap them in with a hammer". As I wrote, I drive them in with a large (suitably sized) socket.
Charlie

 


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