Vehicle & Technical > Discovery
300 TDi HEAD INFO PLEASE
BeJay:
right, Disco started overheating at 55-60 mph, (system was overpressurising) I've pulled the head and although the head gasket wasn't obviously knackered, there were rust witness marks in the bores (2 & 3 just a few spots as it had stood a week before I got round to taking the head off), so obviously water was seeping into bores 2 & 3 from the water gallery that's in the centre (hence the overpressurising when running) now I don't want to just put a new head gasket on and then find I've got to do it all over again, so the question is how much 'bow' is acceptable across the head e.g. I've got 0.003"-0.004" between 2 and 3 in the centre using a straight edge and feelers (I haven't got a D.T.I.) and if this is unacceptable (or unadvisable) how much can safely be skimmed off the head before there's a danger that the valves start getting overfriendly with the pistons :lol:
cheers, Jack.
Range Rover Blues:
According to the LR manual you can't skim a 300 TDi head, you need a new head. If it's overprssured then it probably is warped.
Dozens of us have skimmed them with no ill effects, though the newer heads are cast differently to help cooling.
Anyhoo, I think ours lost about half a mm with no ill effects, a good engine shop will be able to advise. If anywhere near to you there is a really good one on Roman ridge in Sheffield and they charged me
BeJay:
thanks RRB :thumbup:, Landrover probably like to sell as many new 300TDi heads as possible so that would explain the no skimming :lol: I think I'll go with your experience of skimming with no ill effects first, I reckon a 0.010" (0.25mm) skim should sort it so hopefully I'll get away with that OK if you had 0.020" taken off yours without any problems.
cheers, Jack.
lurch_917:
hi one reason landrover say no skimming is due to the amount of piston protrusion you have several thicknes head gaskets 1 hole going to 0 holes cant remember wich way round it goes but its to do with thickness
Saffy:
There is an acceptable level of wrap and that figure is stated in the manual that is often forgotten about and people skim needlessly. Also the manual states how to calculate which thickness gasket is required (there is a thicker save ur ass gasket available too which is not mentioned in manual) . Your old gasket will have a tab on the side with a number of indicator holes in (or blank) which is the thickness indicator.
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