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General Category => General Discussion => Topic started by: neetones on January 13, 2026, 01:56:14 PM

Title: Free Rear Main Seal Installer
Post by: neetones 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://i.ibb.co/Jwdxxq8t/PXL-20260113-194002720.jpg) (https://ibb.co/Jwdxxq8t)

(https://i.ibb.co/ZRnnCW9Z/PXL-20260113-193515545-MP.jpg) (https://ibb.co/ZRnnCW9Z)


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

Nitin
Title: Re: Free Rear Main Seal Installer
Post by: johnwesley 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:
Title: Re: Free Rear Main Seal Installer
Post by: Antietam Classic Cycle on January 13, 2026, 02:53:37 PM
Had one and sold it, never used it. Drive seals in with a big socket instead.
Title: Re: Free Rear Main Seal Installer
Post by: n3303j 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.
Title: Re: Free Rear Main Seal Installer
Post by: DoubleGuzzi 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:
Title: Re: Free Rear Main Seal Installer
Post by: blu guzz 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.
Title: Re: Free Rear Main Seal Installer
Post by: red stripeguz 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

says "vintage large series"
Title: Re: Free Rear Main Seal Installer
Post by: DoubleGuzzi on January 14, 2026, 08:08:45 AM
says "vintage large series"
Any requirement for us small block fans?
Title: Re: Free Rear Main Seal Installer
Post by: Moparnut72 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.
kk
Title: Re: Free Rear Main Seal Installer
Post by: guzzisteve 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.
Title: Re: Free Rear Main Seal Installer
Post by: neetones on January 14, 2026, 09:08:47 AM
https://makerworld.com/en/models/787825-clutch-centering-moto-guzzi?from=search#profileId-779066

says "vintage large series"

I printed that one for my Ambo. Fits perfectly.
Title: Re: Free Rear Main Seal Installer
Post by: Tom H 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
Title: Re: Free Rear Main Seal Installer
Post by: Antietam Classic Cycle 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.
Title: Re: Free Rear Main Seal Installer
Post by: guzziart 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
Title: Re: Free Rear Main Seal Installer
Post by: TN Mark 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://i.ibb.co/Jwdxxq8t/PXL-20260113-194002720.jpg) (https://ibb.co/Jwdxxq8t)

(https://i.ibb.co/ZRnnCW9Z/PXL-20260113-193515545-MP.jpg) (https://ibb.co/ZRnnCW9Z)


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.
Title: Re: Free Rear Main Seal Installer
Post by: Antietam Classic Cycle 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.