P S Robbo
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Overheating after cylinder head repairs.
Hi Guys, Advice required.
Have just rebuilt V6 capri heads / gaskets etc due to oil leaks etc. After putting all back together and running. The car now overheats after 5 minutes at idle. Never overheated before the pull down. Any suggestions on why?
Also, the car manual says to re-torque the cylinder head bolts again after reaching normal operating temperature. Is this done whilst engine is still warm/hot or when cold again or doesn't matter? Thanks for the advice. PSR
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NQRS
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Re: Overheating after cylinder head repairs.
2018/10/19 22:08:48
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What sort of head gasket did you use ? Depending on the type some don't need to be re-torqued. What did the installation instruction for the head gasket say was required? I thought heads were re-done cold . Len
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Wiggy333
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Re: Overheating after cylinder head repairs.
2018/10/20 08:46:49
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Is fuel lean? Did you oil the head bolts before you installed them to get proper torque readings? Sounds like exhaust gas getting into water jackets. Does the temp gauge show it’s overheating or just water coming out the overflow from extra pressure.
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P S Robbo
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Re: Overheating after cylinder head repairs.
2018/10/20 09:06:11
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I just used standard composite type gasket with sealant, oiled bolts before install. Torqued it up as specified no probs, its just that the manual stated to re-torque after reaching operating temp. Temp gauge not working at this stage. Just water coming out of overflow and heating up and boiling out on cap removal. I did remove all water and heater hoses during rebuild. I wonder if some of the water jackets have been blocked or sealant got in during install. I did do all this and then left it for a month whilst overseas before trying to start it.
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Wiggy333
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Re: Overheating after cylinder head repairs.
2018/10/20 09:13:33
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Head bolt torque was changed at some point to be tighter can’t remember the new figure. Also did you cut out the inlet manifold gasket to suit Oval port heads as they are set for D Port heads. 5 minutes is rather quick for over heating so check that radiator hose is squishy top and bottom when you get the problem. If top hose is hard as a rock then water jacket or thermostat problems. Also is it timed correctly?
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P S Robbo
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Re: Overheating after cylinder head repairs.
2018/10/20 15:24:45
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Did not cut out oval port heads on gasket. just put it on and sealed it up. That could be the problem, so that has to be done? Car is tuned properly. Thanks all.
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Paul Dunstan
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Re: Overheating after cylinder head repairs.
2018/10/21 14:01:03
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Not being familiar with the V6 but I know on V8 Clevelands if you put the head gasket on upside down or back to front it closes off water passages and will boil in 5 mins. Heads are identical but I didn’t reverse the head gasket when I reassembled the engine - novice mistake many years ago.
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Wiggy333
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Re: Overheating after cylinder head repairs.
2018/10/21 14:17:16
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Yes must house out inlet ports on gasket as most suit the Dport motor. Creates a restriction on the oval port. Should not need to do anything else though.
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P S Robbo
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Re: Overheating after cylinder head repairs.
2018/10/22 19:02:06
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I am no expert just learning as I go. Forgive my ignorance. I believe I have D port heads. So if I understand. The Inlet Manifold is D port, the gasket is D port, the heads normally O Port. But if my heads are D port does that mean it all should link up. Sorry if its a stupid question. cheers PSR
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Wiggy333
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Re: Overheating after cylinder head repairs.
2018/10/22 19:24:56
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How do you know you have D port heads. Most Capris here(and every car except 11specials) had oval port heads. Can you post some pics to be sure. I would say power would be slightly down because of it but should not cause overheating in five minutes.
The oval port has what looks like a 10 cent piece in front of the carb on the manifold. The Dport does not. The oval port has an offset fan the D port has it centered ( this could be changed though).
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P S Robbo
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Re: Overheating after cylinder head repairs.
2018/10/22 22:41:48
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You are correct Wiggy it is oval port as per your description. As I said learning as I go. Think I'll retake the inlet manifold off, house out ports and see what happens. cheers all. PSR
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GTV6
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Re: Overheating after cylinder head repairs.
2018/10/22 23:32:49
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I doubt any restriction caused by D port vs Oval gasket shape would make it overheat so fast. You should do a compression test. If it fails you probably have a head gasket problem or cracked head and it will tell you which side is the problem. If it passes then its probably the inlet manifold side of things. A compression test will take a lot of the guess work out.
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P S Robbo
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Re: Overheating after cylinder head repairs.
2018/10/30 21:09:29
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I have a new problem now and require suggestions please. Thanks for the advice so far. The car is running kind of lumpy at idle and have timed it and it overheats at 20mins not 5mins. Temp gauge still no go.
The oil pressure gauge line has been blocked off at side of engine with a screw and at last couple of runnings the screw has shot out of end of line and spewed oil every where under excessive pressure I assume. Is this all related to the head and manifold problems. Any suggestions? Cheers Paul
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Noono
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Re: Overheating after cylinder head repairs.
2018/11/02 09:16:33
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P S Robbo
I just used standard composite type gasket with sealant ?? I wouldn't have thought you would use sealant on a head gasket, but I've only built Pinto engines. What sealant did you use?
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P S Robbo
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Re: Overheating after cylinder head repairs.
2018/11/04 09:35:59
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Hi , I used Copper Gasket Spray Cement on the head gasket and Permatex Anaerobic red gasket maker on the Inlet Manifold. Is that OK?
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