If you can get what Citroen call a 'repair gasket' , they are multi layer steel and are thicker than standard, or at least my XM one was, they are also very tough. As long as the gasket is thicker than the protusion of the pistons above the top of the block you shouldn't need to worry, if it improves the compression that can't be bad.

I have in the past rebuilt one of these engines, and have to say that to the best of my knowledge thicker head gaskets are not available. With such an extensive skim required, my advice would be to find another head.

You 'may' be able to work with the head you have by cutting the valve seats deeper, but I really do recommend another head. PSA diesel heads typically have a piece to the edge of the mounting face which is raised from the face to indicate when the skiming limit is passed (when it becomes flush) and the head should be sc***ped. M and M at Holmfirth would be a good bet for a s/h head.

The TUD3 is prone to head gasket failure, due to small radiators, weak water pumps and a design of cooling system which restricts coolant circulation until the thermostat opens to the point at which localised overheating occurs, and eventually blown HG. I suggest you check the condition of the radiator, and fit a new one if it is at all deteriorated, and also modify the thermostat by drilling a 2mm hole in its flange, which will permit some circulation with closed thermostat, and considerably improve reliability. It will also make the system easier to bleed (which must be done with an extension, such as inverted 2 litre pop bottle with the bottom cut off wedged into the radiator filler, with engine run until thermostat opens).

Edited by Dyaneman on 21/06/2010 at 16:48