Water in rear drive - BMW Luxury Touring Community
 
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post #1 of 14 Old Oct 14th, 2010, 12:37 pm Thread Starter
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Water in rear drive

When I changed the rear drive oil it appeared milky and the oil analysis confirmed water in the oil (0.5%)
I've checked the breather cap and it looks OK and the small o ring under the cap also looks good.

Any ideas how water is getting in???

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post #2 of 14 Old Oct 14th, 2010, 12:54 pm
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Re: Water in rear drive

Quote:
Originally Posted by RealWing
When I changed the rear drive oil it appeared milky and the oil analysis confirmed water in the oil (0.5%)
I've checked the breather cap and it looks OK and the small o ring under the cap also looks good.

Any ideas how water is getting in???
Condensation....not running it long enough to get it warm so the water vaporizes out of the mixture.

Just an educated guess.
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post #3 of 14 Old Oct 14th, 2010, 1:10 pm Thread Starter
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Re: Water in rear drive

Quote:
Originally Posted by Scottly
Condensation....not running it long enough to get it warm so the water vaporizes out of the mixture.

Just an educated guess.

I dont think so. I've only driven on long trips. I changed it right after a 4 hr ride to dealer and back.

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post #4 of 14 Old Oct 14th, 2010, 1:17 pm
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Re: Water in rear drive

Ok, here's another educated guess.

Your rear drive unit gets warm under normal operating conditions. The fluid/air expands, and air goes out the vent. You run through a puddle. The water cools it, contracting and sucking in air...and some water with it.
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post #5 of 14 Old Oct 14th, 2010, 2:02 pm
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Re: Water in rear drive

Are you using a pressure washer?
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post #6 of 14 Old Oct 14th, 2010, 3:57 pm
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Re: Water in rear drive

Probably getting in thru the vent when you're washing or riding in the rain..

Good think we change it often

No pressure washing and check it again...in 3k miles.

John

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post #7 of 14 Old Oct 14th, 2010, 4:22 pm Thread Starter
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Re: Water in rear drive

Quote:
Originally Posted by fpmlt
Are you using a pressure washer?

I dont use a pressure washer. I'll check again in 1-2000 Km to see what it looks like.

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post #8 of 14 Old Oct 14th, 2010, 4:29 pm
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Re: Water in rear drive

Check the seal ring on the fill plug along with both mating surfaces. Try using a fiber ring. Readily available at the auto parts store.
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post #9 of 14 Old Oct 14th, 2010, 4:51 pm
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Re: Water in rear drive

Move to Arizona. We have dry heat here. :-)


Quote:
Originally Posted by RealWing
When I changed the rear drive oil it appeared milky and the oil analysis confirmed water in the oil (0.5%)
I've checked the breather cap and it looks OK and the small o ring under the cap also looks good.

Any ideas how water is getting in???

Matt Kas

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post #10 of 14 Old Oct 14th, 2010, 9:20 pm
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Re: Water in rear drive

Me thinks the Rear Drive Water Fairies have have moved north for the winter.


Pull the vent cap off and see if the foam insert is still in there. This is akin to the burpout of oil that occurs some times. Maybe the same mechanism is responsible for the suckin of water.

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post #11 of 14 Old Oct 14th, 2010, 9:29 pm Thread Starter
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Re: Water in rear drive

Thanks John

It can't be the fairies - Canada Customs & Immigration Control will stop all of them at the border !!

I didnt realise there is a foam filter in there. It was not visible when I removed the cap - so I assume it is stuffed down inside the tube (sleeve) that the cap fits on?

Jim

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post #12 of 14 Old Oct 14th, 2010, 9:34 pm
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Re: Water in rear drive

Yup, or it is gone (not sure where they go though...). My spare had it and it is listed as a filter on the parts list. Jeff's failed drive did not have one.

Almost looks like one of those E.A.R. ear plugs that are cylindrical. Never checked the one in my bike.
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John
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2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
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2004 330 Ci Convertable
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post #13 of 14 Old Oct 16th, 2010, 3:54 pm Thread Starter
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Re: Water in rear drive

Quote:
Originally Posted by jzeiler
Yup, or it is gone (not sure where they go though...). My spare had it and it is listed as a filter on the parts list. Jeff's failed drive did not have one.

Almost looks like one of those E.A.R. ear plugs that are cylindrical. Never checked the one in my bike.
John

The foam insert was in the vent tube. I fished it out and it was totally saturated with water when I squeezed it. No doubt that is how the water was getting in.
The vent cap has a small hole in the side and I wondered if water might be forced in the hole depending on which way it was facing??
I also put a little silicone grease on the o ring and bottom of the cap which might help keep water from being forced in??

Still seems strange that water suddenly got in.

Jim
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post #14 of 14 Old Oct 16th, 2010, 8:39 pm
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Re: Water in rear drive

Quote:
Originally Posted by RealWing
John

Still seems strange that water suddenly got in.

Jim
It is even stranger when a little oil comes out the same place. Not sure just how the water gets in there.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
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Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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