Thread: This is starting to drive me nuts

Originally Posted by dullbird

this is not that relevant as ours was a 200tdi but when we had ours skimmed we had to get a ever so slightly thicker gasket I believe to accomidate the fact that the head had been skimmed....

Not usually with a Direct injection diesel DB, as the combustion chamber is in the top of the piston, not the head. BUT, the exceptions are when there is enough removed from the head surface to cause the valves to come too close to a piston when opening or closing, therefore a thicker gasket may be necessary. The Tdi has 4 thicknesses available, a 1 hole, a 2 hole, a 3 hole and a no hole one. I can't remember the actual measurements ATM but they are originally designed that way for a clearance issue regarding deck height and piston crown protrudence, not as a compression increaser/ decreaser.

JC

Originally Posted by justinc

Not usually with a Direct injection diesel DB, as the combustion chamber is in the top of the piston, not the head. BUT, the exceptions are when there is enough removed from the head surface to cause the valves to come too close to a piston when opening or closing, therefore a thicker gasket may be necessary. The Tdi has 4 thicknesses available, a 1 hole, a 2 hole, a 3 hole and a no hole one. I can't remember the actual measurements ATM but they are originally designed that way for a clearance issue regarding deck height and piston crown protrudence, not as a compression increaser/ decreaser.

JC

yeh this is was I was talking about...think the 90 had to get a 3 hole from memory......Sorry I said it probably wasn't relevant I just saw the whole head skimming and someone else suggesting that the gasket could be getting by passed or something and someone else suggesting that the heads although were torqued correctly might not be tight enough due to bolt stretch.

I was trying to put a couple of things together....I.e head skimmed, normal gasket in heads torqued down but not enough to accomidate the thou gap possibly left by the skim and allowing coolant to escape....Sorry bit of girl logic there I will keep my mouth shut

Originally Posted by dullbird

yeh this is was I was talking about...think the 90 had to get a 3 hole from memory......Sorry I said it probably wasn't relevant I just saw the whole head skimming and someone else suggesting that the gasket could be getting by passed or something and someone else suggesting that the heads although were torqued correctly might not be tight enough due to bolt stretch.

I was trying to put a couple of things together....I.e head skimmed, normal gasket in heads torqued down but not enough to accomidate the thou gap possibly left by the skim and allowing coolant to escape....Sorry bit of girl logic there I will keep my mouth shut

No need to do THAT Lou, I was just using your post as an example, if you like, to bring up some info about the reasons why different thickness ones are available. Besides, My wife says 'girly logic' is more logical than mine anyday. I'm reminded of this constantly too, everytime I do something illogical, which is often



JC

Originally Posted by dullbird

I was trying to put a couple of things together....I.e head skimmed, normal gasket in heads torqued down but not enough to accomidate the thou gap possibly left by the skim and allowing coolant to escape....Sorry bit of girl logic there I will keep my mouth shut

Say nothing? .... What for??

I thought that it was a VERY important comment

Nothing worse than finding out the hard way about ... Head gasket? there's a difference?

Mike