Gl1000 overheating


Information and questions on GL1000 Goldwings (1975-1979)
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Wingless bob
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Joined: Tue Mar 26, 2019 12:56 am
Location: Las vegas NV
Motorcycle: 1983-84 gl1200, 1975 gl1000

Gl1000 overheating

Post by Wingless bob » Wed Sep 18, 2019 7:04 pm





Hello all, been a minute since on (career change) just started getting back on the bike since spring. Since I purchased the bike I have found that the po liked looks more than mechanical functionality so have been undoing alot of what has been done. I have now ran into an overheating problem that I'm stumped on. It ran like crap when I first got it but didnt overheat. I checked timing, valves. I changed fuel filter, belts, thermostat, radiator cap, hoses, sparkplugs and fluids. No mixing of fluids found when drained but oil looked overdue, used honda recommended oil. let coolant burp by giving 3 heat cycles and checking again. Synced the carbs and checked compression. Compression is down but evenly around 140psi. Runs great now, go to ride and starts to heat up. Go to stop, cools down. Thought it was the shrouds so ordered some since didn't have any. Sill heats up. Now at idle it sits at 3/4 temp, and heat gun is confirming temperature around 210f at the thermostat. Fan kicks on at appropriate temperature, so I now figured must be the water pump per forums talking about 3/4 temp is signs of failing water pump. Popped cover off and inspected, looked good with no play, kicked kick starter and turned freely. I only took the little cover off that the hose connects to. Should I take the second cover off that covers the water pump for further inspection? Was concerned with doing that with hurting the full front cover gasket. Any suggestions before I throw another $130 at the water pump or does this sound like a water pump problem. Thanks in advance for any help.



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Maz
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Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200
1993 Suzuki GS500E

Re: Gl1000 overheating

Post by Maz » Sun Sep 22, 2019 3:34 am

Why do you think it's overheating? It all sounds perfectly normal to me.
Maz
Ironically, Common Sense is the LEAST common of all senses!

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DenverWinger
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Re: Gl1000 overheating

Post by DenverWinger » Sun Sep 22, 2019 8:23 am

Ya - 210f is perfectly normal.

A couple things to check - Take radiator cap to auto parts store, it is a standard automotive size, they can pressure test it. Or just get another - it is 40 yrs old. I like the lever vent caps.

Since you have an IR Heat gun, get engine warmed up good and measure around the front of the radiator with the engine idling right after the fan has cycled off. You are looking for radiator tubes that are colder than others, the radiator might have some plugged tubes. That could allow it to maintain normal temperatures at idle, but get too hot at road speeds due to the additional heat generation by the engine under load. A competent automotive radiator repair shop should be able to clean the radiator.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

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Wingless bob
Posts: 8
Joined: Tue Mar 26, 2019 12:56 am
Location: Las vegas NV
Motorcycle: 1983-84 gl1200, 1975 gl1000

Re: Gl1000 overheating

Post by Wingless bob » Sun Sep 22, 2019 11:04 am

Thanks guys for the responses, I did forget to say the radiator cap was replaced as well, was the easiest to do so did that one first. My concern on the 210f wasnt that the temperature was going to hurt anything but that is where it wants to stay, so if I do any sort of riding it just it fluctuates above that level. I could be wrong on these models of motors but 220f for water cooled motors is time to shut it down and let cool off, and 260f is catastrophic failure. I will test the radiator vents and get back with results, thanks again.

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DenverWinger
Posts: 1098
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Gl1000 overheating

Post by DenverWinger » Sun Sep 22, 2019 11:09 am

210f is just fine temperature, many thermostats don't even open until 195f.

Pressurized cooling system can get up to 240f without boiling, If you are running down the road without boiling over I'd say things are OK.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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Maz
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Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200
1993 Suzuki GS500E

Re: Gl1000 overheating

Post by Maz » Sun Sep 22, 2019 11:44 am

210f is just below water boiling point (100c) at atmospheric pressure. Pressurised systems in cars and bikes raise the boiling point, so you are perfectly good at the temperature you've got.
Maz
Ironically, Common Sense is the LEAST common of all senses!

Wingless bob
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Joined: Tue Mar 26, 2019 12:56 am
Location: Las vegas NV
Motorcycle: 1983-84 gl1200, 1975 gl1000

Re: Gl1000 overheating

Post by Wingless bob » Sun Sep 22, 2019 12:54 pm

Thanks for the confirmation of that, I will fill it back up and check the radiator for cool and hot spots. I guess last question would be does the bike temp gauge at 3/4 coincide with 210f or should the gauge be reading lower. And if so is that acceptable for the bike to be running at 3/4 on gauge all the time, still in the white but runs to the high side of white on gauge.

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Maz
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Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200
1993 Suzuki GS500E

Re: Gl1000 overheating

Post by Maz » Sun Sep 22, 2019 1:03 pm

The gauges are not accurate and different bikes (even the same model) may read differently. Yours sounds right. Obviously the needle will fluctuate as the fan cuts in and out and this shows that things are working as they should. Also, on a steady run, the fan may not cut in at all and the gauge may well indicate slightly lower, as the air moving across the radiator is sufficient to keep the engine cool, without needing the fan.
Maz
Ironically, Common Sense is the LEAST common of all senses!

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flyday58
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Re: Gl1000 overheating

Post by flyday58 » Sun Sep 22, 2019 5:53 pm

Just read a post on another GL forum about high temps, that one turned out to be the 7V regulator. In that case, along with the high temp the fuel gauge was reading high. Guy ran out of gas twice because of it and finally figured out it was the regulator when it burned out. Just a thought.
"Who left the fridge open?" Tug Speedman

Wingless bob
Posts: 8
Joined: Tue Mar 26, 2019 12:56 am
Location: Las vegas NV
Motorcycle: 1983-84 gl1200, 1975 gl1000

Re: Gl1000 overheating

Post by Wingless bob » Sun Sep 22, 2019 8:59 pm

Here's an update of the over heating issue, I put fluid back In and then burped it by letting it heat up with cap off until thermostat opened, the fluid went down quite a bit and when giving it a little throttle there was movement sucking the fluid down so I'm pretty sure the water pump and thermostat are doing they're job, the fan also kicked on. Checking the radiator, there was no pockets of cool spots just seemed like an even cool down from top to bottom, bottom being the coolest. So decided to go for a ride, the bike stayed at about 3/4 most the ride mostly freeway, so I pulled over to check and was about 210f on the thermostat. Went another 15 miles where I turned around and checked again,




This is the results, I checked the heads, they were comfortably at 200f and so was the rest of the motor. Top of radiator was at 208f bottom was at 195f, So unless there is just a hot spot or bubble by the thermostat I think I'm fine, I just don't like the amount of heat that is around the sensors as that wasn't there before.

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dingdong
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Re: Gl1000 overheating

Post by dingdong » Mon Sep 23, 2019 6:54 am

I just noticed you are in LV. What was the air temp while testing? If air temps are near 100 your engine temp is exactly where mine runs in those temps.
Tom

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Wingless bob
Posts: 8
Joined: Tue Mar 26, 2019 12:56 am
Location: Las vegas NV
Motorcycle: 1983-84 gl1200, 1975 gl1000

Re: Gl1000 overheating

Post by Wingless bob » Mon Sep 23, 2019 7:03 am

Yesterday was a cold day, it only got up to 85f I almost had to put my liner in my jacket :lol: . That was about the time I was riding it, I gave up checking anything during mid summer due to it being so hot outside.



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