DESCRIPTION AND OPERATION
Page 25
CYLINDER HEAD GASKET
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.
When the cylinder head rests on the gasket and
cylinder block, screws passed through the timing
gear mounting plate pull it tight against the plate.
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.
12
Figure 12 — Cylinder Head Gasket
CYLINDER LINERS
The cylinder block uses replaceable wet cylinder
liners. The lower end of each liner is sealed
against the cylinder block with two elastomer
rings. The upper end is sealed with a ring of
EDPM elastomer situated directly under the liner
flange. This design cools the upper section of the
liner better because the area of coolant
circulation is larger.
The lower seals are fitted in grooves in the
cylinder liner. The bottom seal is of a different
material and fluorescent violet in color to
distinguish it from the intermediate seal.
13
Figure 13 — Cylinder Liner and Seals
1. Upper O-Ring — EPDM
(Black)
2. Middle Sealing Ring —
EPDM (Black)
3. Lower Sealing Ring —
Viton (Purple)
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