Oil/Water pump oil leak - BMW Luxury Touring Community
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post #1 of 7 Old Jun 29th, 2019, 9:26 am Thread Starter
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Oil/Water pump oil leak

Oil under bike and after cleaning underside of front end, drips appearing on bottom two left hand bolts of pump cover.
Removed connectors for oil pressure and water temperature, oil in cover for water temperature switch. Noticed open hole where cables from switches disappear. Is this supposed to be open? Manual mentions a cable hole but not plug or seal for it...
I'm not good mechanically and my pet tech is away for three weeks, any advice?

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post #2 of 7 Old Jun 29th, 2019, 10:13 pm
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Re: Oil/Water pump oil leak

The hole is OK, normal. I would first clean up the area very good and then watch it for leaks. It looks like the source of your leak may be higher up on the front cover. Those bolts you circled are on the water side of the oil/water pump so no oil should be there.
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post #3 of 7 Old Jun 30th, 2019, 6:56 am
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Re: Oil/Water pump oil leak

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Originally Posted by jzeiler View Post
The hole is OK, normal. I would first clean up the area very good and then watch it for leaks. It looks like the source of your leak may be higher up on the front cover. Those bolts you circled are on the water side of the oil/water pump so no oil should be there.
I would check for the most common source of oil on an LT engine ... failed breather tube. That will let oil run all over the engine and it looks like yours has a lot of light oily/dirt residue on the front of it. That is consistent with a breather tube letting oily mist waft around the engine.
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post #4 of 7 Old Jun 30th, 2019, 10:23 am Thread Starter
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Re: Oil/Water pump oil leak

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Originally Posted by Voyager View Post
I would check for the most common source of oil on an LT engine ... failed breather tube. That will let oil run all over the engine and it looks like yours has a lot of light oily/dirt residue on the front of it. That is consistent with a breather tube letting oily mist waft around the engine.
Numpty here! Where do I find the breather tube?

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post #5 of 7 Old Jun 30th, 2019, 10:57 am
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Re: Oil/Water pump oil leak

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Numpty here! Where do I find the breather tube?

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On the left side of the engine above the block and inside of the throttle bodies. If you have a Clymer manual, you should be able to locate it easily. If not, you should buy one.

Another place to look is the microfiche diagrams at MaxBMW or Bob’s BMW.
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post #6 of 7 Old Jun 30th, 2019, 8:21 pm
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Re: Oil/Water pump oil leak

Breather tube here.
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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
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #7 of 7 Old Jun 30th, 2019, 9:04 pm
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Re: Oil/Water pump oil leak

With a good LED flashlight, you can look in over the front fender between the radiators and see the top of the engine without taking off any Tupperware. If it is covered with oil, then the breather tube is probably in the process of cracking and disintegrating.

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