loonylandy Posted December 26, 2008 Share Posted December 26, 2008 My head gasket has gone on my 300tdi disco and i want to know what thickness do i replace it with ?? i see there are 3 sizes each defined by a hole catogory. Which one will mine be cheers tony Quote Link to comment Share on other sites More sharing options...
BogMonster Posted December 26, 2008 Share Posted December 26, 2008 You replace it with one the same as what is on there, you can see the number of holes without taking the head off, they are punched into the gasket somewhere where it sticks out from the casting (RH rear corner somewhere I think) Quote Link to comment Share on other sites More sharing options...
Les Henson Posted December 26, 2008 Share Posted December 26, 2008 There's a tab sticking out between No's 3 + 4 injector pipes, which may well have 3-holes in it. This is what identifies your gasket thickness. Les. Quote Link to comment Share on other sites More sharing options...
loonylandy Posted December 27, 2008 Author Share Posted December 27, 2008 There's a tab sticking out between No's 3 + 4 injector pipes, which may well have 3-holes in it. This is what identifies your gasket thickness.Les. thankyou , ill be following your guide anyway . Do you have to have the head skimmed if there is no damage or warping or can i put it back together with a new gasket ?? cheers tony Quote Link to comment Share on other sites More sharing options...
BogMonster Posted December 27, 2008 Share Posted December 27, 2008 No you don't, if the head is OK just change the gasket Quote Link to comment Share on other sites More sharing options...
loonylandy Posted December 27, 2008 Author Share Posted December 27, 2008 No you don't, if the head is OK just change the gasket What about a pressure test ?? Been told to do that now Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted December 27, 2008 Share Posted December 27, 2008 What about a pressure test ?? Been told to do that now If it was using a lot of coolant, check the gasket when you remove it. If the leak is obviously the gasket, just change it. If the gasket looks fine you may have a cracked head so get it pressure tested. If the gasket was blowing between two cylinders then you don't need to get it pressure tested. Remember head bolts can be used 5 times so you can most likely re-use them. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted December 27, 2008 Share Posted December 27, 2008 300TDi's are well known for cracking, so I always get them checked - regardless of the postion of the gasket faling, but then I don't want to take someone else's engine apart again. It's a matter of choice really, but I would get it checked on my own engine. Les. Quote Link to comment Share on other sites More sharing options...
loonylandy Posted December 29, 2008 Author Share Posted December 29, 2008 Well i took it to pieces and found that it had been done before but i think not to a high standard the head bolts under the rocker cover and centre line were hand tight !!! This was cusing the exhaust pressure to go into the water chambers etc so was causing the fountain in the cooling bottle. We cleaned the head and replaved the gasket then refitted the rest of it, topped the water and oil up and i have been out for a drive. Done 60 miles with no ill effects at all so looking good. Will check the head bolts after 200 miles just to be sure. Cheers to Les as the guide was spot on and even a personl with limited knowledge could do it Quote Link to comment Share on other sites More sharing options...
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