Vehicle & Technical > Discovery
300tdi Head gasket ??
Range Rover Blues:
Nope I syphoned some water out to make sure I didn't flood the engine with it but I left a lot in, as long as you are careful scraping the gasket off I couldn't see it doing any harm. Antifreeze is expensive.
minty:
--- Quote from: Range Rover Blues on December 27, 2008, 03:29:21 ---Check it's flat with a steel rule and feelers, if it's warped you are wasting your time putting it back on.
Minty, why fit a thicker gasket if their head has been skimmed? the head it utterly flat, the thickness of the gasket is purely to take account of the variance of piston projection (above the top of the block at TDC).
--- End quote ---
when we changed our one the man gave us the wrong one then told us that there are three different thickness why? i dunno may be it has some thing to do with the bolts going back in and reaching the bottom of the holes ? when the head is skimmed may be its to make up for wot come off ?????? do you no !
Les Henson:
Head gasket thickness is determined by how far the piston protrudes from the block (deck). I don't know that putting a thinner gasket on will cause any damage, but I wouldn't attempt it.
You need a torque wrench and an angle guage to tighten the head bolts.
Stage 1 - 40nm (this is to make sure all bolts have a starting point and are the same initial tightness)
Stage 2 - 60-deg
Stage 3 - 60-deg
Stage 4 - Bolts 1, 2, 7, 8, 9, 10, 15, 16, 17, and 18, a further 20-deg.
A good quality head gasket (Elring, Payen, for example), will come with a slip of paper with the bolt numbers and tightening sequence/figures.
Les.
burgerman:
ALL manafacturers have a minimun thickness for all engine parts. So as long as you do not exceed this there is no problem BUT
You must check the valve protrusion heights above the head face ( also valve tip lenghs) And to skim a head properly the precombustion chambers should be removed first, the head skimmed, then machine the chamber seats to leave the chambers one and a half thou proud of the head face, It dont sound much but it DOES make a difference causing the chambers to come loose and try to find an exit from the engine :shock: Yes it does happen :(
Most PROPER engine shops will be able to carry it out for you
Not done a 300 but a few 200 gaskets not a bad job really
Range Rover Blues:
300 TDi doesn't have precombustion chambers, it's a direct injection engine with the chamber in the piston, which saves you all the work Burgerman is refering to.
The valves will move slightley closer to the piston if you skim the head and IIRC there is a measurement for this in the factory manual. You can adjust this by cutting the valve seats if needs be but I found I didn't.
Unlike a petrol engine the volume of air above the piston at TDC is quite important because the C:R is much higher for one thing and also because the engine runs because the fuel auto-ignites. If you lower the C:R then it won't run as well and you may loose economy, if you go the other way then a piston will hit the head at high speed.
Annoyingly you'll often find that 3/4 pistons will be well away and one will be higher necessitating a thicker gasket. You can then hear that one cylinder is doing all the work at idle hence the clatter.
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