Coolant Leak


Information and questions on GL1100 Goldwings (1980-1983)
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sw3dl1
Posts: 102
Joined: Mon Jul 23, 2012 4:28 pm
Location: Scottsdale, AZ
Motorcycle: 1982 GL1100 Standard
1981 GL1100 Interstate
1980 GL1100 Standard
1988 NX 650
1992 BMW R100gspd
2011 Yamaha WR250r

Coolant Leak

Postby sw3dl1 » Fri Apr 01, 2016 6:09 pm



I have a GL1100 motor from a parts bike I bought several years ago. The motor was from an '82 Interstate that was being parted out because of a title issue. I bought the bike after several parts and pieces had been removed, fairing, bags, seat, exhaust pipes, etc. I was interested in the bike because it only had 7700 miles on it, most of the parts that were on the bike were almost new. Since then I have used most everything on other projects.
I'm presently building a 1980 Standard that has a sour motor so I thought this would be a great time to place my '82 motor into service.
While getting it ready to install, I fired it up on a test stand and let it run for a short time. It needed some freshing up, but fired and ran well enough. I was getting ready to change the timing belts when I noticed a coolant leak coming from the second bolt hole from the left side of the motor where the timing belt cover is attached to the front of the motor. To be a bit more descriptive, it was leaking from the bolt hole just to the right and below of the idler pulley where the second shouldered timing belt cover bolt goes in.
I've worked on a few of these but never had a leak from any of these bolt holes.
Anyone out there ever experirence this?
My first impression was that someone has run a cam case bolt in too far and peirced the water jacket, but those bolts are shouldered and I would think but design would no be able to reach in that far.
The bolt that came out of the hole was not stripped or cross threaded and came out easily without issue.
ANY THOUGHTS?



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WingAdmin
Site Admin
Posts: 17045
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Coolant Leak

Postby WingAdmin » Wed Apr 06, 2016 4:15 pm

Entirely possible that the leak is coming from somewhere else (the crossover on top of the engine is a common place) and it is dripping down to that bolt and appearing to emerge there. Clean it all up, dust with talcum powder, and run it again - the talcum powder will identify leaks instantly, showing their true source.

sw3dl1
Posts: 102
Joined: Mon Jul 23, 2012 4:28 pm
Location: Scottsdale, AZ
Motorcycle: 1982 GL1100 Standard
1981 GL1100 Interstate
1980 GL1100 Standard
1988 NX 650
1992 BMW R100gspd
2011 Yamaha WR250r

Re: Coolant Leak

Postby sw3dl1 » Thu Apr 07, 2016 6:52 am

Thanks for the reply.
I'm pretty certain the leak is from where I described. I have the motor on a work stand that allows me to run the motor with the cam timing covers off the bike. I can see the source of the leak clearly.
After checking the timing cover bolts carefully, I realized that the one longer bolt also has a longer shouldered area as well, somrone in the past has run this longer bolt in to this bolt hole and apparently pierced the water jacket,
I believe I'm going to use some type of gasket sealer in the bolt hole then run the bolt in behind it to see if I can stop the leak.

User avatar
WingAdmin
Site Admin
Posts: 17045
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Coolant Leak

Postby WingAdmin » Thu Apr 07, 2016 3:26 pm

sw3dl1 wrote:Thanks for the reply.
I'm pretty certain the leak is from where I described. I have the motor on a work stand that allows me to run the motor with the cam timing covers off the bike. I can see the source of the leak clearly.
After checking the timing cover bolts carefully, I realized that the one longer bolt also has a longer shouldered area as well, somrone in the past has run this longer bolt in to this bolt hole and apparently pierced the water jacket,
I believe I'm going to use some type of gasket sealer in the bolt hole then run the bolt in behind it to see if I can stop the leak.


Ouch. I might be tempted to try to get a bit of J-B Weld into the base of that bolt hole to seal things up (clean with solvent first) rather than RTV or something that could one day leak again.

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Aussie81Interstate
Posts: 679
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: Coolant Leak

Postby Aussie81Interstate » Thu Apr 07, 2016 4:35 pm

If it has gone through the water jacket - then it is under pressure - so you need something solid in the hole - however you could get it in.. JB weld down the hole - then some silicon sealant as well maybe around the thread - and definitely use a shorter bolt.

sw3dl1
Posts: 102
Joined: Mon Jul 23, 2012 4:28 pm
Location: Scottsdale, AZ
Motorcycle: 1982 GL1100 Standard
1981 GL1100 Interstate
1980 GL1100 Standard
1988 NX 650
1992 BMW R100gspd
2011 Yamaha WR250r

Re: Coolant Leak

Postby sw3dl1 » Thu Apr 07, 2016 5:18 pm

I agree with the JB Weld solution. It seems that this motor was the victim of an inexperienced mechanic. When I got it, it had a bent #2 intake valve, carbs that were missing internal parts and several wiring miscues. Most probabally why it was sold as a parts bike.
When I finally got the motor sorted, it was showing 170 to 175 lbs of compression. Seem a shame to tear it apart for parts because of this coolant leak.
I'll do the JB Weld and sealant fix, I believe it will do the trick.




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