Thread: Loss of compression post head refurbishment.
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Old 10-26-2020, 12:21 AM
volvo-express volvo-express is offline
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Join Date: Aug 2010
Location: Foxford, Co Mayo, Ireland.
Vehicle: 1991 940 TDic saloon, 1989 740 TD saloon.
Posts: 34
Default Compression test
After seeing the reply I went out to the car last night and did the oil / wet method just out of interest on no.1 and 2 pistons. Can imagen I'm feeling a bit hacked off at this as it's my daily driver.

Anyways the car as not been layed up for prolonged period...maybe 1 week without the head on it. When preparing the deck I used quite a bit of penetrating oil so maybe that washed the rings?

Is the best to soak the pistons.. ie drop oild down the bore and hopefully it will lube the rings again?

Later this morning it will be interesting to see if pistons 1 and 2 will return the same compression without putting oild down the bore.
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