Ok Im trying to work out if my Headgasket has gone. Ive done a combustion test, of which the liquid stayed blue. All good!
Then did a pressure test. The Front 3 cylinders all had a pressure of between 160 - 165 psi. However the back three were all down to about 136 - 146 psi. Now my question is, is this usual for the back ones to be slightly differant to the front ones. I could say a defo yes if 1 or 2 cylinders were down, but the whole bank?
Ive been having problems with the temp and stuff and notived that the flow round the engine aint the best with one water pipe been really hot and the bottom stone cold.

Can anyone shed some light before i take the head off.
Cheers

 

Not sure I understand what the question is here...but the pressures would be significantly low if the head gasket was blown. 20 psi, maybe, but I wouldn't sweat over it personally. I would look more for something else, other symptoms.

 

Cheers for the reply............. someone mentioned that the back cylinders maybe boring out coz of the angle of the V. Is this likely to to be case? we are gonna change the water pump and thermostat and see if that does anything.

 

Look inside the water pump you get and make sure they aren't plastic impellars, if they are don't use it!! Anyways, keep me informed I'll try to help you along whatever way I can.