Overheating


Information and questions on GL1100 Goldwings (1980-1983)
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mmode9
Posts: 12
Joined: Sat Dec 12, 2009 12:42 pm
Location: PNW, USA
Motorcycle: 1981 GL1100I
1985 GL1200 Aspencade

Overheating

Postby mmode9 » Tue Jul 01, 2014 12:46 pm



80 GL1100I overheating while riding and worse at idle.
Cooling fan operation is normal. Thermostat replaced. Coolant level and condition is correct.
Visually inspected water pump (metal impellar) not loose and turns while cranking engine over.
No coolant in oil nor vice versa.
Any help ideas or suggestions will be greatly appreciated.
I have searched the forums for an answer nothing seems to apply.



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virgilmobile
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Re: Overheating

Postby virgilmobile » Tue Jul 01, 2014 2:19 pm

Possible bad head gasket.Confirm.
From a cold engine,Pop the radiator cap off.Top it off.
Start the bike and watch the radiator fluid.Some will overflow onto the floor as it warms up.
If a head gasket is blown,you will start to see bubbles in the coolant coming out.Getting more as it warms up.
There should not be bubbles in the coolant.If there is,hot compression is leaking into the water jacket overheating the coolant.

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virgilmobile
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Re: Overheating

Postby virgilmobile » Tue Jul 01, 2014 2:24 pm

By the way.not on a wing but I confirmed the blown gasket on 2 different cars I've owned.Each one had bubbling in the radiator.A good system flows coolant smoothly.
At least its a easy test.
There is also the possibility of a restricted radiator.Harder to prove.

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virgilmobile
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Re: Overheating

Postby virgilmobile » Tue Jul 01, 2014 2:28 pm

Also if it is bubbling,I've adapted a air line to the spark plug hole and compressed at 100psi then watched the radiator to confirm which cylinder is leaking.It may be just one side.
Or just do a complete head job.

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WingAdmin
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Re: Overheating

Postby WingAdmin » Tue Jul 01, 2014 3:02 pm

If you have an infrared thermometer - a cheap one like this one will do - you can point it at various spots on the radiator and identify if there is a blockage.

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mmode9
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1985 GL1200 Aspencade

Re: Overheating

Postby mmode9 » Wed Jul 02, 2014 10:21 pm

Update: removed thermostat guage still creeping up after fifteen minute ride

Used infared thermometer. Upper tank of radiator at 110 the lower tank at 170.

Totally confused. Not head gasket, compression good no fluids intermixing. No loss of power.
.

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WingAdmin
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Re: Overheating

Postby WingAdmin » Wed Jul 02, 2014 10:29 pm

Just to confirm, do you have any other indication of overheating than the temperature gauge?

If you're going solely by the temperature gauge, is the fuel gauge also reading high by any chance? You might want to read this: http://goldwingdocs.com/Store/Goldwing- ... ulator.asp

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mmode9
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1985 GL1200 Aspencade

Re: Overheating

Postby mmode9 » Thu Jul 03, 2014 3:17 am

Thanks admin. Yes I've read that. Fuel guage appears to work correctly and not affected.

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SteveB123
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Re: Overheating

Postby SteveB123 » Thu Jul 03, 2014 6:11 am

mmode9 wrote:Used infared thermometer. Upper tank of radiator at 110 the lower tank at 170.


To me, that indicates a perfectly functioning cooling system.

Test the gauge sender.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

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WingAdmin
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Re: Overheating

Postby WingAdmin » Thu Jul 03, 2014 10:06 am

SteveB123 wrote:
mmode9 wrote:Used infared thermometer. Upper tank of radiator at 110 the lower tank at 170.


To me, that indicates a perfectly functioning cooling system.

Test the gauge sender.


I agree, to me it sounds like everything is right except the gauge reading.

Remove the wire from the temperature sender, and using an ohmmeter measure the resistance between the sender terminal and the engine case. You should see various values for different coolant temperatures:

60C/140F: 104 ohms - Lowest mark on temperature gauge
85C/185F: 43.9 ohms
110C/230F: 20.3 ohms - High end of normal zone on gauge
120C/248F: 16.1 ohms - Beginning of hot zone on gauge

If the temperature sender resistance reads correctly and the meter is still reading hot, then either the meter is faulty, or more likely, the wire between the meter and the sender is being pinched somewhere, and has a partial short to ground.

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mmode9
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1985 GL1200 Aspencade

Re: Overheating

Postby mmode9 » Fri Jul 04, 2014 3:45 pm

My thinkings exactly. Thanks guys!

@ Admin, you rock. You answered my next question before I could even ask it. I was pessimisticly thinking no one would know the answer, but you did and volunteered it.

Now to find the sensor and get it figured out.

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mmode9
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Location: PNW, USA
Motorcycle: 1981 GL1100I
1985 GL1200 Aspencade

Re: Overheating

Postby mmode9 » Sat Jul 12, 2014 3:47 pm

Still no idea what the problem is. Using infared thermometer shows temps in excess of 200 before I get nervous and shut it down, it will get hotter if I let it. I made a jumper wire to short the fan switch and make it run continuously. This is not right, but it keeps the motor cool (too cool really), but at least there won't be any damage.

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1fastgl1100
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Re: Overheating

Postby 1fastgl1100 » Mon Jul 14, 2014 2:29 pm

Locate the water in take (on top of engine behind radiator). this is where the thermostat is housed and where temperature sending unit and fan switch are located. Looking from the right hand side of bike you will see two wires going into the fan switch. directly behind this is the temperature sending unit (it has one wire) and is usually behind the bulkhead).

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HawkeyeGL1200
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1981 GL1100 Interstate

Re: Overheating

Postby HawkeyeGL1200 » Wed Jul 16, 2014 4:23 pm

If it were mine, I'd flush the cooling system (as long as you've already pulled the T-stat). I would refill with 50/50 coolant and I'd consider a new pressure cap for the radiator. Then, I'd get some coil cleaner for AC unit coils, and hose off the outside of the radiator cooling fins with coil cleaner, and wash off according to instructions with the cleaner. Then I'd run it again to see if the temperature gun indicates higher than normal temperatures. If temps have returned to normal, I'd put a new thermmostat in it and go for a ride... the initial temperatures you posted seemed very low to me... but now I see you're seeing temps in excess of 200 degrees...

Just a side note: If memory is accurate, the fan sensor will not cause the fan to turn on until the coolant temperature reached about 210 degrees... so 200 isn't anything to be alarmed about, really... also, if memory serves me correctly then fan cuts OFF at 195 or so....

P.S. Is your oil level and grade correct for your engine? I run 15-40 HD Diesel Oil (Delo 400 LE) in all my bikes.... oil can make a difference too, in my opinion, since it primarily removed heat from the surfaces it lubricates...
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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WingAdmin
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Re: Overheating

Postby WingAdmin » Fri Jul 18, 2014 11:54 am

HawkeyeGL1200 wrote:Just a side note: If memory is accurate, the fan sensor will not cause the fan to turn on until the coolant temperature reached about 210 degrees... so 200 isn't anything to be alarmed about, really... also, if memory serves me correctly then fan cuts OFF at 195 or so....


Fan should come on at between 208-216F, and turn off when it has reduced the temperature to 199-207F.




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