overheating gl1200


Information and questions on GL1200 Goldwings (1984-1987)
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stackermartin
Posts: 5
Joined: Tue Oct 26, 2010 2:45 pm
Location: manchester united kingdom
Motorcycle: 1986 gl1200 aspencade

overheating gl1200

Postby stackermartin » Tue Oct 26, 2010 3:44 pm



can anybody out there help me.i stripped the heads of my gl1200 to fit new valve stem seals,rebuilt it with all new gaskets did 14 miles & overheated badly,stipped it again,had heads pressure tested & skimmed rebuilt agian its still overheating,there were no probs before i had heads of. :(



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virgilmobile
Posts: 7660
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: overheating gl1200

Postby virgilmobile » Tue Oct 26, 2010 4:24 pm

OK, I run a 83gl1100i,but the cooling flow is the same design.Coolant is circulated from the pump through the block,then to the heads,across the return tubes,to the thermostat,to the top of the radiator ,then back to the pump.If you only only only had the heads of I suspect the flow is restricted to the head(head gasket sealing off the water flow).Wrong gasket?Are the gaskets reversable where the coolant path is closed off?You should be able to pull the radiator,and thermostat(if it's in backward it will overheat) and flush water from the bottom through the block back to the upper hose.

stackermartin
Posts: 5
Joined: Tue Oct 26, 2010 2:45 pm
Location: manchester united kingdom
Motorcycle: 1986 gl1200 aspencade

Re: overheating gl1200

Postby stackermartin » Wed Oct 27, 2010 1:38 pm

thanks for advice mate, just looked at old gakets & there identical & can only go on one way. thermostat will only go in one way & i've tried running it without it,still same.one other thing ,when engine is hot turns over sluggish but if i open the throttle it turns over normal & starts ok. just done a compression test all reading ok. had the hose pipe through engine & rad flowing ok. am at my wits end :x

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virgilmobile
Posts: 7660
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: overheating gl1200

Postby virgilmobile » Wed Oct 27, 2010 3:13 pm

OK.back to basics.Confirm coolant flow by removing radiator cap.as the motor runs and warms up you should see coolant flow in the radiator.this will confirm thermostat operation,water pump operation,good water flow,no air bubbles.if all is OK then the overheating may be valve timing off,too lean fuel mixture,wrong ignition timing.You have to have coolant flow,stagnate coolant in the block will overheat in about 10 minutes. remember this is just like any car motor,spark,fuel,compression,cooling all at the right time and in the proper order.It still bothers me tho,It ran fine before the head job and now it doesn't.I would surmise that the resulting problem would be directly related to the work,but what is not to factory specs or overlooked?
ps.if the thermostat is out you should see coolant flow right away.

stackermartin
Posts: 5
Joined: Tue Oct 26, 2010 2:45 pm
Location: manchester united kingdom
Motorcycle: 1986 gl1200 aspencade

Re: overheating gl1200

Postby stackermartin » Thu Oct 28, 2010 12:05 pm

hiya mate,just to let you no job stopped at moment,told you i did a compression test,well putting plugs back in number one cyl has stripped so head will have to come of agian. getting about 130 psi on each cyl but manual says should be about 185 psi,going to drill out & helicoil plug hole,so will be couple of days before back together agian,will let you no of progress. :x

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virgilmobile
Posts: 7660
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: overheating gl1200

Postby virgilmobile » Thu Oct 28, 2010 1:22 pm

I also striped a head bolt,bought the heli-coil kit.I experimented and found blowing in compressed air while taping the hole helped keep it clear of shavings and galling the new threads.I installed the first coil to the bottom and broke off the tab then installed a second one and removed the tab .this gave me a lot of threads to hold onto.130 psi.is still good enough to run with.I started having idle problems when mine dropped to 85 psi.If you have to pull the head,have a look at the gasket and where the coolant goes.look for any restriction in the head or a mis-aligned punched hole.match the new gasket against the old one.Something is different from when it was running cool.

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Ed Z
Posts: 132
Joined: Tue Jun 08, 2010 8:19 am
Location: Baltimore, Md
Motorcycle: 2006 gl1800
1987 gl1200 Aspen
1983 gl650 Intersta

Re: overheating gl1200

Postby Ed Z » Mon Nov 01, 2010 9:43 am

A few things come to mind.... First is the valve clearance being to tight... The other being the cam timing not correct... If the above are good, then I'd move on to checking the radiator to insure it has good flow... Can you see the coolant flowing via the radiator cap while it is getting to hot.??? Are you using the cheap head gaskets from eBay (the ones that claim to fit 1000's, 1100's, and 1200's).??? Have the heads been checked for being warped.???

stackermartin
Posts: 5
Joined: Tue Oct 26, 2010 2:45 pm
Location: manchester united kingdom
Motorcycle: 1986 gl1200 aspencade

Re: overheating gl1200

Postby stackermartin » Mon Nov 01, 2010 1:35 pm

thanks for all the info lads,hopefully i think i've sussed it,refitted head after helicoilling spark plug hole & put a **** load of block cleaner in it,run it up to temp dropped water & fired a hose pipe up the drain hole,i've run it a few times now in in garage & its been behaving itself,not had it out on the road yet coz the weather over here is not good at the moment but will let you no if its been a success.thanks again. :|

stackermartin
Posts: 5
Joined: Tue Oct 26, 2010 2:45 pm
Location: manchester united kingdom
Motorcycle: 1986 gl1200 aspencade

Re: overheating gl1200

Postby stackermartin » Fri Nov 12, 2010 12:23 pm

hi fella's,just to let you know had the wing out this week & its worked spot on,temp guage showing just under half way,fan only had to kick in once when i got stuck in a huge traffic jam, so all in all it seems my problem was an air lock somewhere in the system,thanks agian for all the help,this is the site to visit for top notch people & solutions.

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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
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Re: overheating gl1200

Postby WingAdmin » Fri Nov 12, 2010 12:56 pm

Good job, glad to hear you got it fixed.




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