1997 Ski doo Formula III 600 over heating - Snowmobile Forum: Your #1 Snowmobile Forum
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Old 12-29-2009, 09:07 PM   #1 (permalink)
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1997 Ski doo Formula III 600 over heating

Help....Here is the story took sled for ride road good for about 1 hour or so then shut down over heated - let it cool made it home. This is a triple the 2nd piston was damaged not to bad but a few chuncks missing.

I replace piston and replace rings on the other 2 pistons, Cleaned Carbs - put back together started on 3 pulls! was running for about 4 minutes idle and less than 5 minutes on a quick test ride over heated it shut down. I waited a few minutes made it home. I did compression test all is well still reading 120 ish however still over heating.

Checked heat exchangers getting hot - no coolant leaking anywhere motor is full - checked all hoses.

check plugs the are grayish white so its getting hot could it be Oil Pump? I was thinking about running a mix through to test this theory...

Thoughts anyone
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Old 12-29-2009, 10:28 PM   #2 (permalink)
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Thermostat not working properly.
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Old 12-29-2009, 11:27 PM   #3 (permalink)
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I pulled the Thermostat did quick run machine stayed cool - what will happen If I run it with out Thermostat?
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Old 12-30-2009, 05:35 AM   #4 (permalink)
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Nothing will happen, but the engine is designed to put out the most power at a certain temp. Replace the thermostat.
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Old 01-14-2010, 03:20 PM   #5 (permalink)
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having the same problem 96 fIII

Quote:
Originally Posted by Wheels_17 View Post
I pulled the Thermostat did quick run machine stayed cool - what will happen If I run it with out Thermostat?
Can anyone give a quick rundown on removing an testing the t-stat? Sounds like the best place to start on this sled...
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Old 01-16-2010, 04:45 PM   #6 (permalink)
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Originally Posted by mr2malv View Post
Can anyone give a quick rundown on removing an testing the t-stat? Sounds like the best place to start on this sled...
First drain some of your coolant otherwise you will have a little mess. Next locate the hose on top of your motor right by the spark plugs remove 2 bolts and pull thermostat.

To test boil water on stove get water to 108 degrees thats the factory spec for this thermostat to open drop it in and see if it opens. Good Luck my stat failure blew my sled up
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Old 01-17-2010, 04:06 PM   #7 (permalink)
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Quote:
Originally Posted by Wheels_17 View Post
First drain some of your coolant otherwise you will have a little mess. Next locate the hose on top of your motor right by the spark plugs remove 2 bolts and pull thermostat.

To test boil water on stove get water to 108 degrees thats the factory spec for this thermostat to open drop it in and see if it opens. Good Luck my stat failure blew my sled up

Will try that tomorrow, thanks...pulled the stat, ran without to see if it made a difference or not...didn't seem too...also, the exchangers in the tunnel seem to melt snow well so they're definately warming up, so coolant appears to be moving...tried to make sure there was no air in there, but having trouble with the bleed screw...can this system be bled at the reservoir?
Anything else I should be checking that could be causing this heat? My guage reads right below redline most of the time after it warms up...my other sled runs really low in comparision (670)

Help! (and thanks to all)...
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Old 01-17-2010, 04:42 PM   #8 (permalink)
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burping

I burped my sled by pulling it up on a snow bank and removing the rad cap and let it run for a maybe 5 mins.

Stopped my overheating problem.
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Old 01-19-2010, 03:47 PM   #9 (permalink)
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making some progress...

Tried burping the system, but seemed ok...SO, I drained the coolant and replaced it...double check the thermostat, and refilled the sled....same problem...burped it again...same problem, no air.
NEXT, swapped the guage with one from my 95 670 (twin)...interesting thing happened...my heating problem changed sleds...looks like the problem is the guage, does anyone know if these are different on the 95 mach and the 96 FIII? or will the same p/n work? Looks like that's my next purchase...


Quote:
Originally Posted by mr2malv View Post
Will try that tomorrow, thanks...pulled the stat, ran without to see if it made a difference or not...didn't seem too...also, the exchangers in the tunnel seem to melt snow well so they're definately warming up, so coolant appears to be moving...tried to make sure there was no air in there, but having trouble with the bleed screw...can this system be bled at the reservoir?
Anything else I should be checking that could be causing this heat? My guage reads right below redline most of the time after it warms up...my other sled runs really low in comparision (670)

Help! (and thanks to all)...
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