new issue?
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new issue?
85 f150 6 pickle with the holley 4160 hooker headers, dsII all the goodies. problem, dam thing will start up idle for about 20 mins then slowly work its way up to the H on the temp gauge and stay there. when this happened first i discover i had the wrong water pump (have a 89 motor and put a 89 pump on it thats meant to be used with a serp belt but i had v belts which spun it backwards) corrected that and put a 85 pump on it. new parts are..
new rad, new pump, new thermostat, new temp sensor, new upper, lower, and heater hoses, new heater core, rebuilt head with new gasket, flushed twice, burped all air out of system. and YET IT STILL OVERHEATS. the timing if anything is a little on the advanced side. iv heard retarded timing increases heat.
truck idles smooth, no milky oil, no bubbling of coolant in overflow tank. so what the hell is going on. im way out in left field here. any idears on what it could possibly be. anybody have this problem before
new rad, new pump, new thermostat, new temp sensor, new upper, lower, and heater hoses, new heater core, rebuilt head with new gasket, flushed twice, burped all air out of system. and YET IT STILL OVERHEATS. the timing if anything is a little on the advanced side. iv heard retarded timing increases heat.
truck idles smooth, no milky oil, no bubbling of coolant in overflow tank. so what the hell is going on. im way out in left field here. any idears on what it could possibly be. anybody have this problem before
Posting Guru
Joined: Jan 2005
Posts: 1,299
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From: The Vieux Ford, Kansas
Is it bored out? You can get the cylinder wall too thin and it will cause over heating. Are the timing marks on you balancer right, the outer ring can slip making the timing marks incorrect. If it has a cat they can get plugged up causing excessive heat. Or it could be running lean. Well there is some more things to look into hope it helps.
-John
-John
Posting Guru
Joined: May 2007
Posts: 1,208
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From: North Reading Mass
X2 On not trusting the original temp gauge. If it is over heating check the fan clutch, it might not be engaging. Ive had two fail but both had over 150k. Replaced them with electrics.
regards
rikard
regards
rikard
Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
I have a similar build, with a mechanical gauge. I notice than upon initial start up, and first start of a morning, the temp goes to 210 before the 180 thermostat opens the first time. I guess the fluid at the rear of the engine, where the sending unit is, gets hotter than the front where the thermo is. If you have a 195 thermostat, the temp in the rear of the block, sending unit, is probably reaching 220 before that thermo opens. Just a thought. After initial start it is fine.
Most mechanics who work on classic vehicles all the time will regularly put a vacuum guage on them after timing with a light, just to check the timing. The v. dampener timing marks are held to the center metal bit with rubber. Sometimes the timing marks have slipped.
Good luck.
Most mechanics who work on classic vehicles all the time will regularly put a vacuum guage on them after timing with a light, just to check the timing. The v. dampener timing marks are held to the center metal bit with rubber. Sometimes the timing marks have slipped.
Good luck.
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well i changed the head gasket today. that was easy enough, i had a funnel on the rad before prior to the head gasket trying to bleed the system and the coolant was just bubbleing constantly, and when i would rev it up white smoke would come out the tailpipe. not heavy smoke. but i changed it and am gonna fire it up tomorrow and check it out. timing is advanced. the truck was running really rich before and it was overheating so i dont think its running lean. plugs before all black exhaust all sooty. changed the jet to a smaller one and seems to be fine. but i'll check into the lean issue if replacing the head gasket didnt fix it
Posting Guru
Joined: May 2007
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From: North Reading Mass
If coolant was getting into the combustion chambers it could have gotten into the oil too. There are special additives that can be added to the oil to clean up any left over coolant that can wipe out the bearings. Try a set of the EFI 300 spec Autolites or Motorcraft plugs if your changing them out.
regards
rikard
regards
rikard
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