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Hi all, new to this site and I require some tech advise. Firstly the engine I speak of is a 186 red engine from a HK in my HR. I have given the engine a compression test and all cylinders are at 150psi, which to me is slightly on the high side. I know before I purchased the car there has been work done to the engine.
As the head does need removing can anyone tell me what the specific thickness of the cylinder head is. I just hope it hasn't been machined to much due to a slightly high compression pressure.
Many thanks
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In my experience 150 psi is a good figure for a stock 186, I wouldn't call it high.
Dr Terry |
If at first you don't succeed, just call it Version 1.0 |
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Thanks heaps for your reply Doc, appreciate it. I can now remove the head and see what happening. I'm losing water, plugs 5 and 6 are almost sooty black and cylinders 1, 2, 3 and 4 are burning clean.
Thanks heaps
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Rank: Veteran
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Are you 100% certain that the head needs removing ?
The compression test has shown that the valves are OK, the sooty plugs could be an electrical or carby issue & your water loss could be from any number of areas.
The only reason that you would need to remove the head, is if the head gasket is blown or the head is cracked. Red heads don't usually have cracking dramas & a simple TK test will see if your water problem is indeed a gasket problem.
A TK test is a chemical test that can tell if the radiator coolant has any combustion gases in it. Most good mechanics would be familiar with it.
Another way to test for a failed head gasket is to remove the spark plugs & get a radiator pressure tester & pump it up to maximum pressure & leave it sit for say 1/2 hour. Then get someone to crank the motor over & see if any water sprays out of the plug holes.
The reason I mention this, is in my 40+ years in the motor trade, more than 50% of the heads I've seen removed, were removed un-necessarily.
Dr Terry |
If at first you don't succeed, just call it Version 1.0 |
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Hi Doc, thanks for the reply and you are very correct with what you say. I will do a TK test and go from there although I do like the pressure test as well. I will let you know the progress.
Thanks
David
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