CYLINDER HEAD GASKET CYLINDER LINERS The cylinder head gasket is made of one piece of sheet steel with vulcanized elastomer seals on oil and coolant conduits. The design of the engine and head gasket requires a unique procedure for installation of the cylinder head. The cylinder block uses replaceable wet cylinder liners. The lower end of each liner is sealed against the block with three elastomer rings. The upper end is sealed with a ring of EPDM elastomer situated directly under the liner collar. This design cools the upper section of the liner better because the area of coolant circulation is larger.
The screws and washers at the side guide the head into side-to-side alignment as it is laid on the gasket and block. Screws passed through the timing gear mounting plate into the head pull the head into alignment fore and aft. Small, stamped bosses on the gasket hold the head clear of the seals and allow it to glide accurately into position against the mounting plate during installation. Tightening the head bolts flattens the bosses on the gasket. For this reason, a new head gasket must be installed whenever the head is removed. 10 The lower seals are fitted in grooves in the cylinder block.
The bottom seal is of a different material and fluorescent violet in color to distinguish it from the intermediate seals. 11 Figure 10 — Cylinder Head Gasket Figure 11 — Cylinder Liner and Seals Page 19 DESCRIPTION AND OPERATION 1. Upper O-Ring — EPDM (Black) 2. Middle Sealing Rings — EPDM (Black) 3. Lower Sealing Ring — Viton (Purple)