GL1100 overheating


Information and questions on GL1100 Goldwings (1980-1983)
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poguywantstoride
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Motorcycle: 1981 GL1100 I
1981 GL500

GL1100 overheating

Postby poguywantstoride » Thu Jun 16, 2016 9:53 pm



Hi all, new to the site and am very thankful for any help.

My 81 is overheating, I flushed the radiator and replaced 50/50 coolant and removed the thermostat but it is still overheating. No coolant or oil coming from weep hole under pump housing. The bike has 17000 miles and I plan to replace the belts, but could it be the ignition timing with such low miles?



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702scottc
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Motorcycle: 1980 GL1100 Interstate (sold)
1990 GL1500 Aspencade (sold)
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Re: GL1100 overheating

Postby 702scottc » Thu Jun 16, 2016 10:33 pm

You should never run an engine without a thermostat, the engine will not warm up evenly and the coolant in the radiator will never be able to transfer heat without one. Drain the coolant, install a new thermostat and o-ring, oem is best. im assuming you checked for proper fan operation?

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dingdong
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Re: GL1100 overheating

Postby dingdong » Fri Jun 17, 2016 5:42 am

Yeah, next step is to determine if the fan (thermo switch) is working properly. It should come on at approximately the 3/4 mark on the gauge. Probably pretty warm where you are located so the engine should easily reach fan temps while riding or idling. Engine timing on the 1100 is fixed and non adjustable.
Tom

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Old Fogey
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Re: GL1100 overheating

Postby Old Fogey » Sat Jun 18, 2016 10:06 am

Are you sure that it is actually overheating? Is the temp gauge pegging out in the red? Is the fuel gauge playing up too? If so, your 7v regulator is at fault.
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poguywantstoride
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Motorcycle: 1981 GL1100 I
1981 GL500

Re: GL1100 overheating

Postby poguywantstoride » Mon Jun 20, 2016 10:30 am

It's losing coolant through the overflow when the coolant gauge gets in the red and the fuel gauge is accurate. I'm going to replace the belts, thermos switch and thermostat when I have the money to and see what happens. Thx for the quick responses everyone.

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Slowride84
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Motorcycle: 1981 gold wing 1100

Re: GL1100 overheating

Postby Slowride84 » Mon Jun 20, 2016 9:36 pm

My bike does something similar. I've been told these bikes (1100) run hot and that its normal. had the radiator out and had it flushed out and tested dumped in tank acid etc. so it's better than new. Pre mix Honda coolant installed and fan works. Hwy riding it gets hot sometimes pending on outside temp, but not enough to kick fan on most the time. However stop and go in town riding will raise temp up quick usually regardless of outside temp. Recently rode in San Francisco. it got hot a lot up and down hills stop and go etc. as soon as we hit the highway it cools down. So maybe dump all the money you want but it may be just fine. Let me know if you find a way to keep her cool. As for me when it's 110 I know she's gonna be hot. I'm just done dumping money into this old thing she runs just fine.

f1xrupr
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Re: GL1100 overheating

Postby f1xrupr » Tue Jun 21, 2016 6:33 am

Over heating is not normal. I have experience in this area. Gl 1100 cooling systems are sensitive, even down to the air scoops on the sides of the radiator. Excess pressure in coolant resivor almost has to be coming from a leaking head gasket (high pressure combustion gasses forced into cooling system). I'm sure that's not what you wanted to hear. Unfortunately, at this stage, a compression test may not reveal a problem, nor a spark plug inspection, as the coolant system may not generate enough pressure to push coolant into the cylinder (while not running), but only the combustion chamber....
My exercise bike is a goldwing.

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poguywantstoride
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1981 GL500

Re: GL1100 overheating

Postby poguywantstoride » Wed Jul 06, 2016 12:19 pm

Ok I replaced the thermostat, rad cap, thermos switch and belts, but it still seems to get hot when riding on the interstate only. I replaced the 7 volt regulator with one from an 81 silverwing and the fuel seems to be accurate. Coolant begins to come from the radiator cap overflow port, but I realized the line going to the overflow is leaking, so I'm not sure just yet if its overheating. Could the 7 volt regulator from the silverwing be the wrong choice or a short somewhere be causing the temp gauge to read wrong because the temp gauge goes up at 4500 or more RPM? The fuel gauge seems to be accurate but I noticed it does go up a little when at higher RPM. I am enjoying the ride, so much smoother than the silverwing.

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poguywantstoride
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1981 GL500

Re: GL1100 overheating

Postby poguywantstoride » Wed Jul 06, 2016 12:24 pm

Ohh and the fan does start on it's own now. Could it be the valves need adjustment, and if I do the head gaskets how hard is it, and where could I get a good set at?

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Re: GL1100 overheating

Postby Old Fogey » Wed Jul 06, 2016 1:30 pm

poguywantstoride wrote:Ok I replaced the thermostat, rad cap, thermos switch and belts, but it still seems to get hot when riding on the interstate only.
How hot? like -right off the gauge or just towards the red or what?

Coolant begins to come from the radiator cap overflow port, but I realized the line going to the overflow is leaking, so I'm not sure just yet if its overheating.
The coolant shouldn't be near the overflow pipe under normal running. How full are you filling it? The expansion bottle has a fill mark on it.

Could the 7 volt regulator from the silverwing be the wrong choice or a short somewhere be causing the temp gauge to read wrong because the temp gauge goes up at 4500 or more RPM?
The temperature will always rise some when you are riding harder, but you don't say if this rise with revs is still evident with the engine cool.
I replaced the 7 volt regulator with one from an 81 silverwing and the fuel seems to be accurate.
The fuel gauge seems to be accurate but I noticed it does go up a little when at higher RPM.
The whole point of the 7v reg is to stop that happening. The variation on two gauges makes me think that that reg is not doing the job either.
I am enjoying the ride, so much smoother than the silverwing.



poguywantstoride wrote:Ohh and the fan does start on it's own now. Could it be the valves need adjustment, and if I do the head gaskets how hard is it, and where could I get a good set at?

Most unlikely that valve adjustment is causing any of this. Are you getting white(ish) smoke from the exhaust? If so, does it smell sweet? That would indicate a blown head gasket. If so, do both heads. The forums are full of post from guys that have done the blown one only and then had the other go shortly afterwards.

Head job not difficult, if you have the tools and the knowledge. Without either of those you may be struggling. You WILL need manuals if you are going to do your own work on these old bikes.

Gaskets: http://www.ebay.com/itm/Honda-GL-1000-K ... fA&vxp=mtr
Yeah, now we'll get "only use Honda OEM" messages. Trust me, I use these gaskets all the time and never have a problem.
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poguywantstoride
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Motorcycle: 1981 GL1100 I
1981 GL500

Re: GL1100 overheating

Postby poguywantstoride » Thu Jul 07, 2016 9:12 am

When going 55-65 mph the gauge is about 1/8 inch from the red. When on the interstate it goes into the red. I'm filling the radiator to the top and then run the bike and let it cool and fill again. I'm filling the expansion bottle to the fill mark. The temperature guage does not rise if It's in neutral and I rev the engine to 4500. no smoke at all from the exhaust and with such low miles(17000) I don't think its the head gasket. Compression on all 4 cylinders is 115-121. Any ideas?

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Johnyy Smoke
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Re: GL1100 overheating

Postby Johnyy Smoke » Thu Jul 07, 2016 3:51 pm

Could be a clogged radiator. I never had much luck flushing one out-doesn't seem to work.
My bike had the same symptoms, water pump was fine, thermostat is new, valves were set perfect, timing was on the money, idle jets were fine, no air in the system. Still it ran hot. Found a used radiator for $40, put it on and it fixed the problem. Some times the idle jets running lean can cause overheating, but in this case my money would be on the radiator.
It doesn't take much for these beasties to start running hot. Regards, Johnny

f1xrupr
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Re: GL1100 overheating

Postby f1xrupr » Thu Jul 07, 2016 3:59 pm

Kinda running out of things ti try...might I strongly recommend a cooling system flush! I used automatic dish washer soap powder (they say cascade works best)...I used elcheapo. Rinse out first-put soap in-add clean water-run a few heat cycles-leave it in a few days-rinse out vary good-install THURMOSTAT(!)-add 50-50 prestone. If that don't work..."OFF WITH THE HEADS"!!! ;-)
My exercise bike is a goldwing.

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poguywantstoride
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Motorcycle: 1981 GL1100 I
1981 GL500

Re: GL1100 overheating

Postby poguywantstoride » Mon Jul 11, 2016 9:54 pm

Guys I think I fixed it! I found out the new rad cap I got from napa wasn't making a good seal so I put the original back on. I still have high temp readings on the interstate but I drove it 50 miles don't believe it's overheating. There's no coolant coming from the overflow tank and no signs of overheating. Is it safe to say if it's the coolant is not overfilling the tank and none is pouring out the bike it's not overheating? I also had to rewire the 3 yellow wires coming from the stator as it wasn't charging but it's putting out 12 volts at idle now and higher volts when at higher RPM. The ride was such a stress relief and I'm thankful for all the advice.

Old Fogey
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Re: GL1100 overheating

Postby Old Fogey » Tue Jul 12, 2016 9:07 am

Sounds like you're sorted!
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f1xrupr
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Re: GL1100 overheating

Postby f1xrupr » Tue Jul 12, 2016 9:35 am

If your cooling fan is coming on while you are at interstate speeds, you absolutely have a overheating problem....... Circulation problem, or, combustion gasses.


My exercise bike is a goldwing.


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