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"directional" oil seals

KnowFear

KnowFear

Cruisin' Guzzisti
Joined
Feb 2, 2011
Messages
103
Calling all oil seal experts!

The rear main seal is "directional" - i.e. there is an arrow in same direction as the crank rotation. I just noticed tonight that the transmission input oil seal also has an arrow in the same direction as the crank rotation.

My problem is that the oil seal kit I got from MG Cycle http://www.mgcycle.com/product_info.php ... ts_id=1910 does not include a "directional" oil seal for the transmission input, but it does include two oil seals of the correct size (one is blue, one is brown) but neither have the directional arrow.

Are these oil seals OK to use in this application (transmission input shaft)? Brown or blue?

thanks
Chris
 
They'll be fine. The brown one is a Viton seal more reistant to heat and goes at the front. The blue one is a flurocarbon seal, most likely a Guzzi 35mm fork seal, which are interchangeable with but actually better than, the standard 'Black' nitrile seals usually used in that application.

Just as important as the seals are the o-rings. Don' forget them!!!!

Pete
 
Hello Pete - you are a rockstar in the Guzzi world!

Are you referring to the o-rings used to replace the conical seals for the clutch actuating rod? I have those. I also have the larger o-ring to seal the throwout bearing assembly.

I might leave the output seal for the time being, as I can always replace it relatively easily without major fuss.

Thank you sir!
Chris
 
KnowFear said:
Hello Pete - you are a rockstar in the Guzzi world!

Are you referring to the o-rings used to replace the conical seals for the clutch actuating rod? I have those. I also have the larger o-ring to seal the throwout bearing assembly.

I might leave the output seal for the time being, as I can always replace it relatively easily without major fuss.

Thank you sir!
Chris
Click to expand...

I think Pete was referencing the two that go behind the clutch hub that is mounted on the transmission input shaft. If you have the transmission out, I'd go ahead and replace the output seal. It is much easier to do on the bench. Be careful not to loose the little steel ball. Also when removing the speedometer drive, do not grab the outer lip with pliers. If you can find Pete's detailed transmission instruction I believe he shows how to remove it by expanding needle nose pliers against the inner surface of the drive piece.
 
john zibell said:
KnowFear said:
Hello Pete - you are a rockstar in the Guzzi world!

Are you referring to the o-rings used to replace the conical seals for the clutch actuating rod? I have those. I also have the larger o-ring to seal the throwout bearing assembly.

I might leave the output seal for the time being, as I can always replace it relatively easily without major fuss.

Thank you sir!
Chris
Click to expand...

I think Pete was referencing the two that go behind the clutch hub that is mounted on the transmission input shaft. If you have the transmission out, I'd go ahead and replace the output seal. It is much easier to do on the bench. Be careful not to loose the little steel ball. Also when removing the speedometer drive, do not grab the outer lip with pliers. If you can find Pete's detailed transmission instruction I believe he shows how to remove it by expanding needle nose pliers against the inner surface of the drive piece.
Click to expand...

Hi John - I found the two o-rings that seal the clutch hub from behind. What is the "little steel ball" that you are referring to? Why would I need to remove the speed drive? Chris
 
OK - I see the ball that locks the speedo drive to the worm-drive gear.

What is the procedure for replacing that output seal?
 
KnowFear said:
OK - I see the ball that locks the speedo drive to the worm-drive gear.

What is the procedure for replacing that output seal?
Click to expand...

Pete's shimming procedure includes removing the speedo drive https://www.guzzitech.com/Files/Gearboxshim.pdf I find that using a 27mm deep impact socked on an impact wrench makes dissassembly easy. Just remove the round piece that the seal rides on. It is not necessary to remove the piece the speedometer cable connects to. With ring out, gently pry the old seal out and install the new. Set the speedo drive ring, set the steel ball (It goes on the long slot on the output shaft), and tighten the nut and peen the lip to lock it on the output shaft. Job done. Also a look at the parts manual for the order of parts may help you.
 
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