Re: Re: Compression Number

[Anonymous]

Right, I warmed the engine up and took the rocker cover off.

I unscrewed each head bolt (in order) a tiny bit and then re-torqued them a little tighter in turn. Before I did this I saw some leakage from the rear of Cylinder 4. I have heard the modern head gaskets require more torque than the original spec. So with a warm head I torqued them about 15Nm more.

I also checked the valve clearances again, with a warm engine. found two to be slightly out including valve 2 (cylinder 1) and valve 7 (Cylinder 4).

Retested the compression.

Cylinder 1 – 9.2 bar (previous 8.8)
Cylinder 2 – 9.3 bar (previous 9.2)
Cylinder 3 – 9.1 bar (previous 9.0)
Cylinder 4 – 9.0 bar (previous 8.0)

So the head may not have been fully tightened.

I also checked for water in the oil (before any adjustments) using the splatter test (yes I have been up all night study You Tube videos 😆 ) and with heating the oil in a jam jar lid, if the oil just smokes it is fine but if it splatters i.e. the water boiling off, then it has water in it. I have some water in the oil. So I will run it again and drive for another 50km or so and then replace the oil. By that time my CO2 tester will have arrived and I will be able to check again for any leakages (in this case combustable gases in the coolant).