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Yes, it is the weep hole for the water pump and they have been known to leak. In 15K on my '13 GSW I've now found small indications of fluid loss twice; the last time was last week. I'll clean it off again. If more indications show up it will be off for repair. A mechanic at a local dealer says it is not common, but not unusual, either. He's changed 3 water pumps.
On my GS both times I found indications of leaking was after a trip that included high ambient temps and sections of slow speed dirt or other technical roads that had the cooling fan on often. Might be coincidence, might not. I have not lost enough coolant from the overflow reservoir to bring the level below the min mark.
Yes, it is the weep hole for the water pump and they have been known to leak. In 15K on my '13 GSW I've now found small indications of fluid loss twice; the last time was last week. I'll clean it off again. If more indications show up it will be off for repair. A mechanic at a local dealer says it is not common, but not unusual, either. He's changed 3 water pumps.
On my GS both times I found indications of leaking was after a trip that included high ambient temps and sections of slow speed dirt or other technical roads that had the cooling fan on often. Might be coincidence, might not. I have not lost enough coolant from the overflow reservoir to bring the level below the min mark.
I wonder if BMW knows how to make water pumps. The K1600 and now this.
Maybe they order them from the same folks who supplied Yamaha pumps for their FJR bikes.
I wonder if BMW knows how to make water pumps. The K1600 and now this.
I recall that my 85 K100RT had a water pump a "couple" of years earlier.
I saw a thread on another web site in which some posters have pointed out that some of these water pump seals leaked for a while, and then stopped. If this sounds hard to believe, I had a seal on a rebuilt transmission for my old '86 K75 leak for a week or so and then stop, and never leaked after that.
Thread here: http://www.ukgser.com/forums/showth...e-a-hole-in-their-2014-GS-Crankcase-like-this
Harry