Rear main seal leak

dpilot · 11-02-2009, 10:06 PM

I bought a R1100R with a leaky main seal.
I havnt fixed it yet, but it would seem to me that excessive clearance in the rear main bearing would allow the crank to beat up on the seal.
I intend to check the fit!!!
JimV.

boxerr · 11-03-2009, 05:11 AM

Unless it has done a heap of miles, or hasnt been serviced all that well, I doubt the main bearings would be worn.

I maybe wrong

PGlaves · 11-03-2009, 10:07 AM

Quote:

Originally Posted by boxerr

Unless it has done a heap of miles, or hasnt been serviced all that well, I doubt the main bearings would be worn.

I maybe wrong

I agree. Voni's R1100RS is at almost 350K miles, my R1150R is at 130K miles, and a coiple of others have about 80K miles. And I have no concerns about the main bearings in any of them.

BMW Boxer mains seem to last forever. Seals - now that's a different story.

And checking the main bearings requires removing the engine and splitting the cases which is a project not undertaken lightly.

osbornk · 11-03-2009, 10:57 AM

I had a leaky rear seal with Synthetic oil and it stopped when I changed to Dino oil.

dpilot · 11-03-2009, 08:32 PM

I am expecting to put a dial indicator on the crank and see how far it moves up and down.
I have worked on a lot of german machines and I believe there could have been too much clearance in the git go.
Whatever if the crank moves too far, i will act accordingly

JimV.

11-02-2009, 10:06 PM	#1
dpilot Registered User Join Date: Oct 2009 Location: Souithern Ohio Posts: 23	Rear main seal leak I bought a R1100R with a leaky main seal. I havnt fixed it yet, but it would seem to me that excessive clearance in the rear main bearing would allow the crank to beat up on the seal. I intend to check the fit!!! JimV.

11-03-2009, 10:57 AM	#4
osbornk Hillbilly in the sticks Join Date: Feb 2006 Location: Marion VA Posts: 1,595	I had a leaky rear seal with Synthetic oil and it stopped when I changed to Dino oil. __________________ Black 86 R80RT Brown 03 R1200CLC

11-03-2009, 08:32 PM	#5
dpilot Registered User Join Date: Oct 2009 Location: Souithern Ohio Posts: 23	Rear main seal leak I am expecting to put a dial indicator on the crank and see how far it moves up and down. I have worked on a lot of german machines and I believe there could have been too much clearance in the git go. Whatever if the crank moves too far, i will act accordingly JimV.

11-03-2009, 05:11 AM	#2
boxerr Registered User Join Date: Dec 2006 Location: Australia Posts: 199	Unless it has done a heap of miles, or hasnt been serviced all that well, I doubt the main bearings would be worn. I maybe wrong