Follow the instructions and your top end job should be completely successful.Īlso be aware there are differences between the upper and lower push rod tube seals. Here is the head bolt torque and tightening diagram. The “Turbo” bolts are higher strength and can be used in naturally aspirated engines, but be aware a set of Turbo bolts currently runs over $400 if you want to make this upgrade. There are head bolts for all non-turbo engines and there are head bolts for Turbo charged engines. There are also two types of head bolts in these engines. Obviously head bolts with excessive corrosion or other visible defects should not be reused. We have reused head bolts in our shop in many engines with no head gasket issues. The factory manual does recommend replacing the bolts but the head bolts are reusable as they are not torque to yield bolts. There are also discussions around the reuse of head bolts on these engines. So to make sure all engines would pass emission certification and they would not have to scrap parts if the tolerances were off slightly multiple head gaskets developed and were installed as needed at the factory in new engines. Slightly lower compression in diesels can result in increased unburned hydrocarbon emissions and soot. Best guess is there were multiple thickness to make sure the engines would pass emissions within the manufacturing tolerances. Obviously, they were made to adjust for manufacturing tolerances. There has been significant speculation why there were multiple head gaskets. Again the replacement head gasket will work in all engines. We have had a number of customers become very concerned they are not replacing the exact gasket that was originally in their engine. Lister Petter has discontinued all but one of the head gaskets and there is only one thickness head gasket available as service parts. The thickness of the head gasket is identified by small holes punched in the external corner of the gasket. The Lister Petter LPW series parts manual lists three different thicknesses for head gaskets.
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