Cylinder Head

Cylinder Head Warp

• Clean the cylinder head (see Cylinder Head Cleaning).

• Lay a straightedge [A] across the lower surface of the head at several different points, and measure warp by inserting a thickness gauge [B] between the straightedge and the head.

• If warp exceeds the service limit, repair the mating sur­face. Replace the cylinder head if the mating surface is badly damaged.

Cylinder Head Warp Service Limit: 0.05 mm (0.002 in.)

Cylinder Head Cleaning

• Remove the cylinder head (see Cylinder Head Removal).

• Remove the valves (see Valve Removal).

• Wash the head with a high-flash point solvent.

• Scrape [A] the carbon out of the combustion chamber and exhaust port with a suitable tool.

• Using compressed air, blow out any particles which may obstruct the oil passage [A] in the cylinder head. Install the valves (see Valve Installation).