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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Cylinder head

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Old Nov 8th, 2019, 08:45   #1
Thowdfella
Thowdfella
 

Last Online: Jul 23rd, 2022 10:04
Join Date: Feb 2019
Location: Chorley
Default Cylinder head

I did a compression test on my 1966 122s and this showed 125 lbs on each cylinder so decided to take the head off and have the unleaded conversion done.
first question is - should there be washers on the cylinder head bolts? there was one washer on one bolt. I looked through Brookhouse and there is no mention of washers for the bolts.
Second question is about the compression. I was expecting around 175 for compression but only got 125, but the same on all cylinders. borrowed another compression tester and the same results. however, when I took the head in for conversion they whipped a couple of valves out and they looked quite good and the springs look ok although the exhaust guides were a bit worn.
Where has my compression gone? All the pistons feel tight.
I was advised to put the pistons so they were all half way down the cylinder and fill to the top with diesel fuel and watch the results to check the pistons which I will try.
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