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"KRS/GT" Technical Q&A K1200RS/GT Technical Questions/Answers

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  #1  
Old 04-02-2018, 03:02 PM
sabredude sabredude is offline
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03 k1200GT, Oil in Coolant Reservoir!?

I have a '03 k1200GT (109,000 miles). I noticed oil on my back shock after a ride a few weeks ago and my first thought was rear main seal/clutch (had both replaced at 85,000 miles). When I investigated, took off the seat and the oil was overflowing from the coolant reservoir! Pulled off the rubber cap and removed the oil with a turkey baster and put it into a 100ml graduated cylinder. There was about 10 - 15 ml of oil on top of the coolant, and the reservoir looked like only coolant (green!) was still in it. Thought this was strange, went for another ride later (50- 60 miles) and noticed the oil again, once again removed prolly 10 - 20 ml of oil from the reservoir. The oil level (Amsoil - synthetic 20W50) in the sight glass might have been down a teeny bit, oil does not appear cloudy or frothy and no apparent steam in the exhaust. Talked to some local K1200 riders and they believe it is the water pump/oil pump seals, so I purchased the seals and o-rings. Took the bike for a short ride (15 - 20 miles) yesterday to warm it up and then drain coolant and oil to change the pump seals. After about 10- 15 minutes the fans came on, but temp gauge was normal (a little less than 1/2 way). Fans stayed on, when I got home and was backing the bike into my garage (engine and fans still running) the red overheat light came on (first time ever) and I immediately shut off the engine, which to me did not seem to be abnormally hot, and parked the bike on center stand. Checked oil level 2hrs later (after a 75 mile ride on my 85 K100), and it was at the bottom of the sight glass, and oil was again in the reservoir.
So could this be the water/oil pump seals failing and letting oil into the coolant? Looking at the pump diagram I think it is improbable, but anything is possible. Could it be a head gasket? Although I was always told the coolant would get into the oil, not oil into the coolant with a head gasket. This week I will most likely remove the oil/water pump and check/change the seals since I have them. How else can I check if the head gasket is bad, and if it is bad, is that a job I should have a shop handle? Are there special tools required? Or is it time to get a new bike?!?! Thanks to all who read this!!
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Old 04-02-2018, 04:01 PM
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pbegin@burton pbegin@burton is offline
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Re: 03 k1200GT, Oil in Coolant Reservoir!?

Same thing happened on my K100RS.But not to the extent that you see.It was the oil/water pump seal shaft.

Pitted for sure the shaft.At the time that was a rather common occurence with the Ks.

Apparently fixed by BMW in the early 90s.At about the same time when they changed their coolant recommendations from the "green" to a "no phosphates/ nitrites" formulation.

Related to the "fix" that change in coolant specs? Just maybe.....dates match.What I do know is that nitrites in coolant may turn into Nitric Acid over time.Corrosive....!
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Old 04-04-2018, 03:50 PM
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Sea Gull Sea Gull is offline
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Re: 03 k1200GT, Oil in Coolant Reservoir!?

I think many of us have had to renew the seals. Though, I believe there is still the weep hole on the underside of the pump housing that begins dripping when the seals go bad. But, maybe not if it is the shaft at PB notes? At any rate, it is a quick and easy fix to do first before you go to the head gasket. I had a head gasket R&R on my K1100RS and it was because the coolant was leaking out there at the top back of the head, dripping on my toe and exhaust and eventually the tire (similar to the oil dripping from the breather hose failure....).
For the seals on the water/oil pump, I was not a good enough mechanic. Even Paul Glaves notes it is a tricky seal install and best left to very competent mechanics. After I messed up a set, I simply took the pump in to the dealer and paid them to install it and I did all the other R&R work saving a LOT for what the job is. Good Luck.
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Old 04-05-2018, 10:05 AM
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Re: 03 k1200GT, Oil in Coolant Reservoir!?

That one should have been stickied:

http://www.i-bmw.com/showthread.php?t=61454

We didn't have much for instructions in the late 80s.Haynes manual with a "critical to installation" pic reverse printed.
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Honda CB750F at 18
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2003 K1200 RS at 53 (Oh Yeah......over 6000RPM)
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