temp gauge pegs out


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Optimurphprime
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temp gauge pegs out

Postby Optimurphprime » Thu Jul 07, 2011 9:46 pm



Been reading through most of the posts on cooling systems (yes i read the DIY). I have flushed the coolant system once already, it does not have a thermostat and I have the fan switched bypassed so it will run (switch is bad). My gauge pegs out when on the interstate or after riding on the highway for a while. I don't appear to have any fluid over flowing out of the reservoir. The engine runs fine and does not act like it is over heating. I have read where folks say they run hot naturally, but I am a little concerned. I have a new thermostat to install. I have looked at the impeller while the wife turned the bike over and it turns fine. Some help please.


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Re: temp gauge pegs out

Postby virgilmobile » Fri Jul 08, 2011 8:32 am

The purpose of the thermostat is 2 fold.
1st.it restricts coolant flow to a minimum to allow the engine to reach operating temperature quickly.
2nd and more importantly,It regulates the flow of coolant to the radiator to allow proper cooling.If the thermostat is missing,it not only can take a long time to warm up,but it won't slow the coolant down in the radiator enough to allow it to cool off.
The coolant has to spend a little time in the radiator to give up it's heat.
If it just whips through it will actually slowly get hotter and hotter.My 1000 had no thermostat,around town it was low temp,interstate it would steady climb to the red region.

Now my 1100 and 1200 (new thermostat)will run mid range in town and about 3/4 interstate,just under,but not in the red.

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Re: temp gauge pegs out

Postby dingdong » Fri Jul 08, 2011 8:51 am

+1 to above and they don't run hot naturally. Whatever the reason you have a problem.
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Re: temp gauge pegs out

Postby virgilmobile » Fri Jul 08, 2011 9:13 am

One last point.A hot engine is not normal,but what is HOT?
I suspect a hot engine is exceeding 200 degrees.The thermostat should regulate it,with air flow obviously,at or near 185 degrees.
A accurate measurement can be taken.Don't assume the gauge is 100% accurate.But it also has a test for it.

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Optimurphprime
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Re: temp gauge pegs out

Postby Optimurphprime » Sun Jul 10, 2011 7:07 am

Well I put the new thermostat in (oh what fun). Took it down the road and the temp gauge was all over the place. I let it sit for a while and on the way back it still went past the H. I wonder if the gauge is bad? I did notice that now that I have pressure on the system, I have leaks in the radiator (small ones). Is there an analog replacement available or do I have to rig something else?
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Fred Camper
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Re: temp gauge pegs out

Postby Fred Camper » Sun Jul 10, 2011 7:51 am

Could be the 7 volt regulator, you should check its output. The temp sensor is easy to replace if required.

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Optimurphprime
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Re: temp gauge pegs out

Postby Optimurphprime » Sun Jul 10, 2011 7:59 am

Fred Camper wrote:Could be the 7 volt regulator, you should check its output. The temp sensor is easy to replace if required.

Ok, where is that? I don't have a multimeter if that is needed.
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Fred Camper
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Re: temp gauge pegs out

Postby Fred Camper » Sun Jul 10, 2011 9:29 pm

Seven volt regulator is under the left faux tank cover. The Sensor itself is down on top of the engine just rearward of the fan switch. It is visable from the right side of the engine, under the carbs.

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Re: temp gauge pegs out

Postby WingAdmin » Mon Jul 11, 2011 5:16 pm

You could also have air bubbles in the cooling system.

If the fuel gauge isn't also acting erratically, then it's not the 7 volt regulator, as that regulator runs both the fuel and temp gauges.

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Re: temp gauge pegs out

Postby Optimurphprime » Sat Jul 16, 2011 12:46 pm

Yeah, my fuel gauge is erratic. It only seems to work when the tank is full. So the volt regulator is now on my list. will check rad for air
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Re: temp gauge pegs out

Postby Fred Camper » Sun Jul 31, 2011 8:13 am

Woah, a fuel gauge takes more than that to be erratic. A good one reads full at full, about half way on the gauge when a gallon down, and near empty when 2 gallons down. They are for entertainment mostly. So do not jump to the conclusion that your fuel gauge is erratic.

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Re: temp gauge pegs out

Postby Optimurphprime » Sun Jul 31, 2011 8:42 am

Well, I put in the thermostat and found out that I have some leaks in the radiator. Gauge still shows hot and pegs out. I would really like to replace it with an analog gauge so I can see some real numbers.
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Re: temp gauge pegs out

Postby Fred Camper » Sun Jul 31, 2011 8:46 pm

Any air in the system, which is certain with a small pinhole or larger leak, will result in air in the block and this air will not provide the proper coolant to the coolant sensor. So that certainly will provide an erratic gauge reading until the leak is fixed and several warm up and cool down cycles happen. Each warm up cycle pushes a bit of air out of the coolant circuit and each cooldown pulls just a bit more coolant into the circuit. So it takes about three of these cycles to "pack" the coolant circuit and rid the air.

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Re: temp gauge pegs out

Postby 78AzWing » Thu Aug 04, 2011 8:37 am

Your gauges are analog gauges. You may mean you want digital gauges for numbers to show up.

Although I do agree that the temp gauge could use some numbers on it, to go along with the markers.
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sfruechte
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Re: temp gauge pegs out

Postby sfruechte » Thu Aug 04, 2011 8:21 pm

My temp guage pegged many years ago and it was that 7v regulator under the left tank cover.

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Re: temp gauge pegs out

Postby Fred Camper » Thu Aug 04, 2011 8:40 pm

Optimurphprime must fix his pin hole leaks first or this issue will not be solved. I am pretty sure it is due to air in the system. Either way, that needs to be fixed anyway so the regulator can be studies later.

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Re: temp gauge pegs out

Postby youcantoo » Tue Nov 22, 2011 8:57 pm

Fred Camper wrote:Could be the 7 volt regulator, you should check its output. The temp sensor is easy to replace if required.


If it were the 7v regulator his other gauges would also be totally screwed up.

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Re: temp gauge pegs out

Postby youcantoo » Tue Nov 22, 2011 9:00 pm

Optimurphprime wrote:Well, I put in the thermostat and found out that I have some leaks in the radiator. Gauge still shows hot and pegs out. I would really like to replace it with an analog gauge so I can see some real numbers.



The gauges are all ANALOG! Do you mean with a digital readout?

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Re: temp gauge pegs out

Postby Old Fogey » Sat Dec 03, 2011 1:37 pm

youcantoo wrote:
Fred Camper wrote:Could be the 7 volt regulator, you should check its output. The temp sensor is easy to replace if required.


If it were the 7v regulator his other gauges would also be totally screwed up.


Not so. Only the fuel and the temp gauge powered from the 7v reg.

He needs to get the cooling system leaks sorted, but the problem is the reg.
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Re: temp gauge pegs out

Postby sfruechte » Sun Dec 18, 2011 1:53 pm

Definitely the 7v regulator. My 77 temp guage and fuel guage both pegged when mine went.

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Re: temp gauge pegs out

Postby Bikecentennial » Tue May 12, 2015 9:57 am

I have the same problem on my 76 Gl1000. Sporadically, the temperature gauge and gas gauge both redline together. So I ordered a replacement 7v regulator and while awaiting its arrival took the bike on a two and a half hour trip for the weekend. My fan is also bypassed with a toggle switch (previous owner). On the way to my destination I had the same redline problem with both gauges. However, after the weekend on the way back home, the weather was cool so I rode the whole way with the fan off, it did not redline once. Is it possible that the fan wiring is somehow causing the seven volt regulator to short out?

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Re: temp gauge pegs out

Postby WingAdmin » Tue May 12, 2015 9:58 am

Bikecentennial wrote:I have the same problem on my 76 Gl1000. Sporadically, the temperature gauge and gas gauge both redline together. So I ordered a replacement 7v regulator and while awaiting its arrival took the bike on a two and a half hour trip for the weekend. My fan is also bypassed with a toggle switch (previous owner). On the way to my destination I had the same redline problem with both gauges. However, after the weekend on the way back home, the weather was cool so I rode the whole way with the fan off, it did not redline once. Is it possible that the fan wiring is somehow causing the seven volt regulator to short out?


No, the circuits are completely different and separate. More likely it is heat that is the culprit. Solid state electronic devices (like the 7 volt regulator) will often, when failing, begin to do so only at higher temperatures.

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Re: temp gauge pegs out

Postby Bikecentennial » Tue May 12, 2015 10:15 pm

WingAdmin wrote:
Bikecentennial wrote:I have the same problem on my 76 Gl1000. Sporadically, the temperature gauge and gas gauge both redline together. So I ordered a replacement 7v regulator and while awaiting its arrival took the bike on a two and a half hour trip for the weekend. My fan is also bypassed with a toggle switch (previous owner). On the way to my destination I had the same redline problem with both gauges. However, after the weekend on the way back home, the weather was cool so I rode the whole way with the fan off, it did not redline once. Is it possible that the fan wiring is somehow causing the seven volt regulator to short out?


No, the circuits are completely different and separate. More likely it is heat that is the culprit. Solid state electronic devices (like the 7 volt regulator) will often, when failing, begin to do so only at higher temperatures.



Thank you, that would make sense, I'll be sure to replace the regulator when the part arrives.

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Re: temp gauge pegs out

Postby bjarne1959 » Mon Apr 18, 2016 7:13 am

Following up the former discussion .... :D

I have replaced my 7v regulator on my GL1000-76 (Ltd). With great success ! everything is OK now :D
But what is the technical idea of having a regulator from 12 to 7 volt for theese two instruments ? Why not 12v all the way ??
With my best Regards :D
Bjarne H C, Norway

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Re: temp gauge pegs out

Postby sfruechte » Mon Apr 18, 2016 9:31 am

To obtain a consistent 7 volts instead of a variable 12.5 to 14.5.




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