overheat causes?
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overheat causes?
Hello all. First post here. I own a 7.3L '94 IDI that's overheating, or at least, running hot. Hasn't gone red yet & don't want it to! A friend checked it out & said there was a crack in the radiator & pressure in the radiator. The pressure could be from cracked core or blown head gasket he says. But there's no water in the oil & there is no loss of power. Still runs strong, just heats up extremely quick (up hills & on the freeway it went to the "L" on the temp gauge) Then when I shut it off, the water in the overflow is boiling. Trying to start small. Any help is appriciated.
Thanks,
Dan
Thanks,
Dan
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Joined: Sep 2002
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From: Northeastern Pa - USA
did you increase the fuel delivery at any time ? Is it turbocharged ? Did you replace the thermostat with original type from international ? Is the radiator fins plugged with crap ? Does the fan clutch work properly ? There are the cheapest places to start. Hope it helps you out.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
dsfleye,
Welcome to FTE and the IDI diesel forum.
The only thermostat you can use in the Navistar diesel has to come from either Ford or International. The rest of them will cause problems.
Welcome to FTE and the IDI diesel forum.
The only thermostat you can use in the Navistar diesel has to come from either Ford or International. The rest of them will cause problems.
Posting Guru
Joined: Sep 2002
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From: Northeastern Pa - USA
if it did run hot at any time, you may have a crack in one of the heaads that will only show up when hot. Watch the coolant level and also check the oil fill cap for any sign of coolant in the oil or compression in the radiator. I do beleive the radiator cap is set for 10-12 lbs which is normal. You might also have a goofy guage, they only worth about $1.50. Good luck.
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Thanks all for the replies. The radiator was toast, so I put a new one in. Doesn't run hot anymore. Compression test showed 3 lbs of pressure in the radiator & the radiator cap is 13lbs. The thermostat is a Motorcraft 195 degree which I understand is acceptable. When I come home & do take the oil fill cap off, it seems to steam a bit. That doesn't look good to me! Any suggestions appreciated. Thank you
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
The steam in the crankcase is probably oil vapor.
If it were water or steam you would see white looking sludge on the high part of the dip stick and under the oil fill cap.
Are you running DCA 4 or another SCA in the coolant to prevent cavitation?
If it were water or steam you would see white looking sludge on the high part of the dip stick and under the oil fill cap.
Are you running DCA 4 or another SCA in the coolant to prevent cavitation?
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Clean oil cap & yes running with Fleetguard. If there's something better I'll gladly run it. I wanna keep this in the best condition I can. Just took it for a spin & feels like power, freeway to hill climb. Thanks all for the knowledge. Brand new to this diesel thing, hoping to learn alot (already have in the last few days here). Seems this is the place, eh? See you all soon...but hopefully not too soon. Lol!
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