87 over heating


Information and questions on GL1200 Goldwings (1984-1987)
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1programer
Posts: 5
Joined: Wed Nov 24, 2010 10:12 pm
Location: Farmington NM
Motorcycle: 93 gold wing GL1500

87 over heating

Postby 1programer » Mon Sep 02, 2013 10:15 am



I have been trying to solve a over heating problem for to long. This is what I have done so far.
replaced the thermostat twice.
had the radiator flushed.
replaced the cooling fan.
removed the thermostat . ( this helped as long as I keep moving)
the water pump has steel impellers.
new cap.
Is there anything that I am missing? If not....anyone want to buy a parts bike?



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virgilmobile
Posts: 7659
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 87 over heating

Postby virgilmobile » Tue Sep 03, 2013 11:25 am

One thing you overlooked.A overheating engine can be caused by a blown head gasket.
Usually noticed by bubbles in the radiator.
And yes the bike will still run.The bubbles are noticed when the engine gets up to temp.
Remove the radiator cap,watch it when cold and during the warm up.
The antifreeze will expand and spill out.Just keep it topped off till warm.
Normally you should only see circulating fluid,no bubbles.

pointpounder
Posts: 18
Joined: Tue Aug 14, 2012 3:23 pm
Location: Farmington, NM
Motorcycle: 87 interstate

Re: 87 over heating

Postby pointpounder » Tue Sep 03, 2013 2:08 pm

Thats one thing I thought it could be. Took in to the honda shop they checked the head gasket was fine. I would let them trouble shoot but I do not need a 1500. bill.

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virgilmobile
Posts: 7659
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 87 over heating

Postby virgilmobile » Tue Sep 03, 2013 2:52 pm

Been there done that with a "Dealer testing"
While working on a car mind you( 4 cylinder),it ran just fine,good power,idled great etc etc.
10 miles from home the temp would always creep to the red.
I didn't find the problem till one time I happen to notice the little bubbles.Only when the engine was up to temp.Everything else was spot on.just those bubbles when it reached operating temp.
At least look.It won't cost anything to either confirm or dismiss the 'blown head gasket' theory.
There dosen't seem to be much else you haven't done.

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nightair
Posts: 23
Joined: Wed Jun 06, 2012 11:37 pm
Location: Medicine Hat, Alberta, Canada
Motorcycle: 1985 Aspencade Special Edition

Re: 87 over heating

Postby nightair » Wed Sep 04, 2013 10:17 pm

Hello.
As Virgil said it is possibly a blown head gasket. Just had the same scenario with 85 Ltd, bike ran fine but heated up and stayed there, tested thermostat, fan, and fan sensor all OK, however since mine has the option to switch to see the oil temp and press I began to notice the oil temp sky high and the press low. Cooled the bike , removed the cap and filled it to the top, started the motor and a geyser shot out (it took a lot to fill by the way!!), put the cap back on and in 5 minutes white smoke appeared in plumes. Only on a hot day and a hard run did the rad temp go crazy, I could not shut it down and re start if longer than 15 minutes, heat soaked.
Vac press was lower than usual before the incident occurred.
It has been in the shop for weeks having head gaskets replaced and valve work.
After the white smoke I drained the rad fluid when it cooled, cleaned the plugs and it fired up and ran like a kitten!! Head gasket was blown just enough to cause all this.

pointpounder
Posts: 18
Joined: Tue Aug 14, 2012 3:23 pm
Location: Farmington, NM
Motorcycle: 87 interstate

Re: 87 over heating

Postby pointpounder » Thu Sep 05, 2013 7:06 am

This is what I thought( the head gaskets). I brought it to the Honda shop to have them replace. They called me and said they check the bike out head gaskets were fine and did not need to be replaced. These guys are money hungry, hard to beleive they would pass up the job. But I will go to them again.

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virgilmobile
Posts: 7659
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 87 over heating

Postby virgilmobile » Thu Sep 05, 2013 8:56 am

This is only a theory.Its easy to verify yourself.Not really necessary to rely on a dealer to test it.

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nightair
Posts: 23
Joined: Wed Jun 06, 2012 11:37 pm
Location: Medicine Hat, Alberta, Canada
Motorcycle: 1985 Aspencade Special Edition

Re: 87 over heating

Postby nightair » Thu Sep 05, 2013 11:53 am

I should also state my troubleshooting as "my opinion".
The leak can be so small as to be negligable on a compression test. What I would recommend is the same test we do on aircraft piston engines, it's referred to as a differential compression test or Leak down test. Remove the plugs and bring each cylinder to TDC, hold either the cam pulley or crank in place, put 80 PSI into cyl and see what the difference is between the gauges. It's the best indicator for engine condition as you can determine if its a valve, rings or head gasket. Remove the rad cap and look for bubbles, ensure the engine has been warmed up before doing it or you can do one cold and one hot/warm test. The tear down of the heads is not really intense and should take you half a day. Good luck




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