Author Topic: K75 s engine oil leak  (Read 484 times)

Offline Rcgreaves

  • ^ SuperNatural Motobricker
  • Posts: 742
K75 s engine oil leak
« on: December 13, 2019, 09:31:28 PM »
Removed lower case fairing to find this oil leak, small enough it doesn’t appear on ground... yet.  Maybe that sender? Oil pump?  Most likely culprit?
  • Livingston, SW WI. USA-"With the good earth all around."
  • Newest Resto: 96 Honda Interceptor VFR750F, Also Restoring: 1995 K1100RS, 1994 K75S ,1985 Goldwing Aspencade
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Offline The Mighty Gryphon

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Re: K75 s engine oil leak
« Reply #1 on: December 13, 2019, 11:10:26 PM »
I'm gonna guess timing chain cover.  Where it contacts the valve cover.  That seam is sealed with goop, and it can leak if it's not sealed properly.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue, '89 K100RS Special edition White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS "Moby Brick Too
'89 K100RS SE

Online Martin

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Re: K75 s engine oil leak
« Reply #2 on: December 14, 2019, 12:00:57 AM »
Thoroughly clean and dry it, then run or ride it. If it's hard find, after cleaning and drying spray with spray on talcum powder in your preferred fragrance,  it will show up easier.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.
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Offline Chaos

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  • Mars needs women!
Re: K75 s engine oil leak
« Reply #3 on: December 14, 2019, 09:27:31 AM »
Put the lower fairing back on.
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Offline billday

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  • Posts: 1336
Re: K75 s engine oil leak
« Reply #4 on: December 14, 2019, 10:28:44 AM »
Put the lower fairing back on.

That's what I was going to say. All the spotless bikes I see on here are making me feel like an oddball. It's nice to see a picture of a bike that looks like mine.
  • New York State, USA 10977
  • 1985 K100

Offline Past-my-Prime

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  • Posts: 198
Re: K75 s engine oil leak
« Reply #5 on: December 15, 2019, 11:01:42 AM »
I have three identified current oil leaks, each of which requires a different fix.
1: last oil change I didn't have a new crush washer so reused mine and there is a drip there. I've since bought a dozen so am set for the next go around.
2: the O-ring for the oil filter cover needs to be very clean and crack free. I think I've maybe got a crack because I get a small amount of seepage around that. Next oil change I'd like to replace that.
3: the oil/water pump is letting a bit of oil ooze onto the front of the motor. I've not had the courage yet to disassemble and potentially replace that.
All in all, I lose hardly any oil and that would be my main concern. The garage floor where I park isn't as pretty as it could be but I don't need to top up between oil changes so that's good.
  • North Shore of Lake Superior
  • BRICK: 1989 K75 RT - Rocinante; NONBRICK: 2007 F650 GS Dakar - not yet named

Offline Chaos

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Re: K75 s engine oil leak
« Reply #6 on: December 15, 2019, 11:12:26 AM »
Check the o ring for flattening also
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Offline volador

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  • Posts: 622
  • NEEDS MORE CHROME
Re: K75 s engine oil leak
« Reply #7 on: December 15, 2019, 11:43:08 AM »
I have three identified current oil leaks, each of which requires a different fix....
3: the oil/water pump is letting a bit of oil ooze onto the front of the motor. I've not had the courage yet to disassemble and potentially replace that.
... so that's good.
https://www.euromotoelectrics.com/product-p/pumpkit870.htm

https://www.euromotoelectrics.com/product-p/pumpkittool628.htm

https://www.euromotoelectrics.com/product-p/3bsealant376.htm

Service Bulletin 11 046 91 (2458) & 11 001 02 (002)

Water Pump
pre-1986-87? original design old style impeller 11411461177

Superseded by 11412325850 design change the shaft with gear Z=32 teeth, shaft- 11411461183

Superseded by 11417676366 same shaft with gear Z=32 teeth

latest design 11517676371 design change shaft with gear Z=19 teeth, shaft- 11411461793
  • NYC NY
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Offline Nine80seven

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Re: K75 s engine oil leak
« Reply #8 on: December 17, 2019, 12:44:51 PM »
Leave lower fairing off, next rain ride will clean it up.
  • MN
  • 85 K100RS

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