What is cylinder 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.
How is protrusion measured?
A dial gauge with a measurement bridge is used for measurement of the piston protrusion. This can be recognised by the change in direction of the dial gauge needle. Once top dead centre has been determined, the pretensioned dial gauge is placed on the surface of the engine block and the needle is set to 0.
What is valve protrusion?
In order to properly cut the seats, my friendly machinist is asking what should be the protrusion of the valves, i.e. the distance from the bottom of the valve spring well into the cylinder head to the tip of the valve stem, when the valve is fully seated.
How to check a cylinder block liner protrusion?
Fire the first three of the serial number in and go to systems and components. Then go to basic engine, then cylinder block gp. Testing and adjusting contains information on checking the liner protrusion. If you go to reuse and salvage guidelines, halfway down it will have Procedure for reconditioning cylinder blocks.
How does the liner protrusion work on a Mack E-7?
Three things to consider when looking at the cylinder liner sleeve installation process for the Mack E-7 reman: Liner protrusion is the measurement the cylinder liner extends above the surface of the engine block. It is supposed to stick above the surface of the block and act essentially as a cushion on the cylinder head gasket.
How do you measure the liner projection of a cylinder?
Use the 8T-0455 Liner Projection Tool Group to measure the liner projection at “A”, “B”, “C” and “D”. 4. Record measurements for each cylinder. 5. Add the four readings for each cylinder. Divide the sum by four in order to find the average. Note: If the liner projection changes around the liner, turn the liner to a new position within the bore.
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.