replacement engine has overheated
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jamesmartin
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id use another source to measure temp,presume youve cured issue of original problem,like faulty rad etc
Datatek
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Petrol or diesel? About 95C max for the diesel.
Datatek
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What about the viscous fan?
stjohnsmythe
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Did the garage that fitted it supply the engine? If so, take it back! Or is it a second hand engine off fleabay or similar?
NikTheGeek
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I'm obviously not disputing that as I don't know any better and you know FAR more than me about all things mechanical. But... if it's 95'c max, how come when my RAD split, steam poured out of the bonnet, yet very little coolant was lost, as I caught it in seconds (very little coolant loss would indicate that water was still in the rad and the block and therefore the engine hadn't overheated - yet lots of steam would indicate water over 100'c). Also, why bother having a pressurised system as I thought that was to increase the boiling point of the coolant so it could run over 100'c.
Just asking for my own knowledge
Nik
StuckAgainSteve
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It is my belief hat most V8 engine problems are caused by cooling issues - it's not an engine fault that causes the over-heating it's the lack off cooling that did for the engine! All you've done is put another engine into a car with a cooling issue and the new engine will go the same way as the old one. HGF is a symptom of overheating - not a cause. Slipped liners are a symptom of overheating - not a cause etc. etc.
Datatek
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A sudden drop in pressure will cause localised boiling in the head particularly around the exhaust ports.I'm obviously not disputing that as I don't know any better and you know FAR more than me about all things mechanical. But... if it's 95'c max, how come when my RAD split, steam poured out of the bonnet, yet very little coolant was lost, as I caught it in seconds (very little coolant loss would indicate that water was still in the rad and the block and therefore the engine hadn't overheated - yet lots of steam would indicate water over 100'c). Also, why bother having a pressurised system as I thought that was to increase the boiling point of the coolant so it could run over 100'c.
Just asking for my own knowledge
Nik
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I'm obviously not disputing that as I don't know any better and you know FAR more than me about all things mechanical. But... if it's 95'c max, how come when my RAD split, steam poured out of the bonnet, yet very little coolant was lost, as I caught it in seconds (very little coolant loss would indicate that water was still in the rad and the block and therefore the engine hadn't overheated - yet lots of steam would indicate water over 100'c). Also, why bother having a pressurised system as I thought that was to increase the boiling point of the coolant so it could run over 100'c.
Just asking for my own knowledge
Nik
The cooling system is pressurised at up to 15 PSI by the cap. Each pound of pressure increases the boiling point of the coolant by 2 degrees F. So instead of the coolant boiling at 220 degrees F it will only boil at or over 250 degrees F. If any parts of the coolant are at or above boiling point and the pressure suddenly drops flash steam will be released.
kevwill
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Is the viscous fan coupling new? If so, take it back to the garage. Get a sniff test done. Sounds like HG failure.
