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post #1 of 7 (permalink) Old 26-02-2009, 12:43 Thread Starter
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Thermal Shock

Is this really a cause of HGF???

I had a Rover 400 a few years ago, and I was told it was then.

I took the thermostat out, and drilled a 3/16 hole through the fixed part.

This allows some water to bypass the thermostat, meaning that it will heat up evenly, and there wont be a sudden rush of cool water when the thermostat opens.

Only drawback is that ir takes slightly longer for the engine to warm up.
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post #2 of 7 (permalink) Old 26-02-2009, 12:46
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you still get a 'rush' of cool water when the stat opens, even with the little hole drilled.

Do a search for PRT...
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post #3 of 7 (permalink) Old 26-02-2009, 13:00 Thread Starter
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you still get a 'rush' of cool water when the stat opens, even with the little hole drilled.

Do a search for PRT...

Do I take it that this is common practice? I hadn't seen it mentioned before.

There may be a rush of "cooler" water when the thermostat opens, but the difference isn't as great, the radiator feels much warmer before the thermostat opens.

I am more used to drilling several 1/4 or 5/16 holes in the fixed plate to get extra cooling in a hotter climate (can't remove the thermostat as it often causes the water pump to cavitate, ending up with less cooling)
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post #4 of 7 (permalink) Old 26-02-2009, 13:07
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I have heard good and bad things about the PRT, i think its down to what you think will be best...
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post #5 of 7 (permalink) Old 26-02-2009, 13:12
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I have heard good and bad things about the PRT, i think its down to what you think will be best...
That's interesting, I don't think I've come across anything negative about PRT.
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post #6 of 7 (permalink) Old 26-02-2009, 13:17
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That's interesting, I don't think I've come across anything negative about PRT.
I been told that because there 'bigger' than the normal pipe that runs there it can rub and then break, my xpart have said they have had to replace many recently.... I havent got one as they persuaded me but then it might be worth asking about; maybe even Russel and see what he says...
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post #7 of 7 (permalink) Old 26-02-2009, 14:35
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Thermal shock is just one small part of the head gasket failure mechanism. Fitting a PRT to Freelander and the later MGs did not stop the failures, but it does ease one of the causes. Drilling a hole through the stat is not the solution to gasket failure.
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