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"K13GT" Technical Q&A K1300GT- Technical Questions/Answers

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  #1  
Old 10-17-2017, 10:32 PM
frankr frankr is offline
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Thumbs down WHY DOES REAR SEAL LEAK AFTER REBUILD?

I had the rear drive rebuilt and after only 2 000 miles the seal started to leak. It was fine before the rebuild. I notice in the parts that there are a number of different adjusting washers Parts 10 33 11 7 690 608 to 619 available for the rebuild. Could I have the wrong one which may push out he seal and leak out the oil??? 2010 K1300gt with 88 000 miles
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  #2  
Old 10-18-2017, 01:41 PM
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Re: WHY DOES REAR SEAL LEAK AFTER REBUILD?

Are you talking the little one 60mm or the larger one?
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  #3  
Old 10-21-2017, 12:47 AM
OnthewrongPlanet OnthewrongPlanet is offline
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Re: WHY DOES REAR SEAL LEAK AFTER REBUILD?

There are many reasons a seal can leak and only a quality mechanic can diagnose during disassembly of the unit again. I will also say not all mechanics do the very same work in same way as theres a lot of "she'll be right" or they were not trained to a high standard and/or have pride in their work.
Having people throwing ideas at you (and many are obviously not mechanics by their replies provided) I dont think will help you determine the leak cause.
All Seals look simple but if not installed correctly can and do cause grief.
Most Lip seals have numbers on the rubber lip part allowing easy parts match to another quality brand available but occasionally Ive provided OD, ID and depth so you dont always have to purchase OEM if they are very expensive. If the rebuilder did not install correctly as I have seen they can also be damaged or not seated all the way causing premature wear. If a seal is leaking means you can also have ingress of dirt and/or moisture so sooner the better. Best of luck to you and I understand your frustration.
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Old 10-21-2017, 07:19 AM
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Re: WHY DOES REAR SEAL LEAK AFTER REBUILD?

So I will answer the question asked:

1) Wrong seal used.
2) Defective seal.
3) Seal damaged during installation.
4) Seal not properly installed.
5) Damaged or worn part seal is being installed in.

In most cases it really comes down to the individual doing the job - did he/she purchase the correct seal - did he inspect the seal before installing - did she install it correctly and not damage it - and did they look at the parts they were working on to make sure they were not worn or damaged.

So I change my mind two reasons for the seal leaking - person doing the job almost always the case - and on rare occasion a defective seal that could not be detected upon inspecting it.
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Old 10-21-2017, 08:18 AM
OnthewrongPlanet OnthewrongPlanet is offline
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Re: WHY DOES REAR SEAL LEAK AFTER REBUILD?

Any breather blocked will also push oil or its mist out wherever weakest point is as it heats up in use then suck back dirt or moisture as it cools when parked up.
I have not used my infra red thermometer to know how warm they get. Ive only been a BMW K12S owner a year and hasnt crossed my mind but for interests sake will measure one day soon.
Shouldn't get too warm unless blasting across the Aussie Nullabor all day on a 50C day, loaded up and full noise as can happen here.
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Old 10-21-2017, 06:15 PM
paulmogs paulmogs is offline
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Re: WHY DOES REAR SEAL LEAK AFTER REBUILD?

Quote:
Originally Posted by OnthewrongPlanet
Any breather blocked will also push oil or its mist out wherever weakest point is as it heats up in use then suck back dirt or moisture as it cools when parked up.

BMW engineers & designers failed to fit a breather on this model FD, one of the reasons why oil quantity was reduced from 230cc to 180.

May have been oil filled to old spec.
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Old 10-22-2017, 12:37 AM
frankr frankr is offline
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Re: WHY DOES REAR SEAL LEAK AFTER REBUILD?

Thanks for all of the possibilities. I will order a new one and have it replaced.
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