B7100 Head Gasket Shim

[ttfo]

I am rebuilding the engine in my B7100 HST D (old).
The rebuilding gasket set and parts diagrams in the shop manual show a shim for the head gasket. I cannot find anywhere that explains if or when you should use the shim. Anybody have any definite info on this shim, when or if you need it?

Thanks...

 

[lsmurphy]

A shim gasket is not a separate item to the gasket but a thicker gasket.

Used to compensate for 'over-milled' head or block.

Unless your head has been decked several times..........ignore the shim gasket.

 

[Retlaw66]

Used to compensate for 'over-milled' head or block.

I agree. The shim is to compensate for milled head or deck.

 

[North Idaho Wolfman]

The shim is to compensate for piston to head clearance when you have sleeved the motor, there are notes in rebuilding manuals to show when you need it.