What is a liner protrusion?

What is a liner protrusion?

Liner protrusion refers to how far the cylinder liner protrudes above the spacer plate on the top of the block. If the liner does not protrude enough, the head gasket can, and will, fail.

What happens if you don’t have the correct liner protrusion?

Not having the correct protrusion can result in catastrophic engine failure. I have seen everything from a leaky head gasket to a cracked liner flange, to damaged pistons & cylinder head decks. All because someone neglected to measure the protrusion.

Why do you need a liner on a gasket?

Liner protrusion is the distance the cylinder liner sticks above the deck surface of the block. The main purpose of cylinder liner or sleeve protrusion is to give you the proper amount of “crush” on your cylinder head gasket.

What causes a crack in a cylinder liner?

When installing the cylinder liners, they had trapped media under the flange. This resulted in improper liner protrusion and a cracked liner flange. This is an extreme case, but can happen with any foreign debris from steel shot to sand to dirt.

Why do you need a liner on a cylinder head?

The main purpose of cylinder liner or sleeve protrusion is to give you the proper amount of “crush” on your cylinder head gasket. This ensures that once torqued, your cylinder head crushes the gasket evenly and to the correct specification.

What are the problems with incorrect liner protrusion?

The most common problems from incorrect liner protrusion are leaky head gaskets, damaged pistons, pitted cylinder head decks and cracked liner flanges. Take a look at the photos, under magnification, of correct and incorrect liner protrusion.

What happens if cylinder liner is not installed?

Not having the proper seal between the head and block can result in catastrophic engine failure. The most common problems from incorrect liner protrusion are leaky head gaskets, damaged pistons, pitted cylinder head decks and cracked liner flanges.

What is the purpose of cylinder liner protrusion?

What is the purpose of liner protrusion? Liner protrusion is the distance the cylinder liner sticks above the deck surface of the block. The main purpose of cylinder liner or sleeve protrusion is to give you the proper amount of “crush” on your cylinder head gasket.

Liner protrusion is the distance the cylinder liner sticks above the deck surface of the block. The main purpose of cylinder liner or sleeve protrusion is to give you the proper amount of “crush” on your cylinder head gasket.