Vehicle & Technical > Discovery
300 TDi HEAD INFO PLEASE
Saffy:
--- Quote from: BeJay on October 03, 2010, 12:06:27 ---
--- Quote from: ChrisW70 on October 03, 2010, 11:55:34 ---
Chris, is 0 holes the thickest gasket? there's no mention of a 0 hole gasket in the haynes, if it is then I'll get one of them for rebuild, or is the 0 hole the same as the 'save your arse' one Saffy mentioned.
cheers, Jack.
--- End quote ---
That's the one, it's not mentioned in haynes.
--- End quote ---
burgerman:
As quoted above, A good engine shop will advise correctly, Every cylinder head has a minimum thickness, So heads can be skimmed and the valve heights should be checked and adjusted ( by cutting the seats and refacing the valves) also tip the top of the valves so you dont loose valve clearence adjustment, If all this is in spec and done correctly you should be able to use the same thickness of gasket as you removed ( presuming it was correct? ) I worked in a engine shop for 14 years and done work for most manafacturers whose heads "cant be skimmed"
BeJay:
cheers Burgerman, thanks for the info, I'll see what the engine shop says.
Range Rover Blues:
Skimming has no effect whatsoever on piston projection.
Don't fit a thicker gasket than you need, it is important.
Head warping accross the diagonal is acceptable, a concave head is not and this is oftne what happens with an overheat.
LR did not design the head to be skimmed unlike the 200 TDi but it's an acceptable risk. If you go too mad you need to worry about the valves but 0.010, just make sure you set the tappets.
You need to skim it 'till it's flat BTW, I'm sure they won't take off more than is needed.
BeJay:
thanks RRB, I realise skimming the head has no effect on piston protrusion, but it will obviously 'drop' the valves by an amount equal to the skimming which is why I was going for the thicker gasket, as I have no idea how much clearance there is theoretically between a fully open valve and a TDC piston, the head is concave by about 0.004" using straight edge and feelers, so allowing for another couple of thou because obviously this isn't the most accurate method, I'm hoping 0.010" will clean it up, you reckon I'll still be OK with the same gasket as original then? (vave clearances being set properly)
cheer's Jack.
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