LPG Discussion Forum

Hi I have recently suffered a head gasket failure on my V6 Frontera the heads have been pressure tested both heads were good, heads skimmed and replaced.

the heads have been replaced with all new gaskets etc but I still seem to have a problem of the cooling system over pressurizing I have checked all I have checked compression's all good have done a cylinder leakage test and all cylinders are well within accepted range. engine runs lovely on petrol bit of a miss on lpg at idle.

My question is if the fault is in the lpg reducer, with the lpg switched off on switch on dash could the lpg still allow gas to get into cooling system resulting in over pressue.

LPG system is AC Stag Zavoli S reducer and Valtek 34injectors

Many thanks

Dai

The reducer can go porous and leak gas to the coolant chamber. It's not very common though. Two pairs of long nose pliers and a couple of cable ties round the handles will quickly diagnose it on petrol. Or two hose clamps if you have them. Just clamp off the reducer coolant pipes.
Have you bled it up properly ? In the back of my mind there is something odd about the water pump on the v6 ?

Thanks Tubbs yes bled it out ok after I posted my question I temp re plumbed the reducer out of the loop and the short time I had to run it after it seems to have stopped the bubbles, will have more time to give it a good check in the morning

Many thanks again mate

Dai