VALVES
DESCRIPTION
The valves are made of heat resistant steel and
have chrome plated stems to prevent scuffing. All
valves use three bead locks to promote valve rotation
(Fig. 9).
VALVE SPRING
DESCRIPTION
The valve springs are made of high strength silicon
chrome spring steel. The springs are common for
both intake and exhaust valves. (Fig. 9).
CYLINDER HEAD COVER
DESCRIPTION
The cylinder head cover (Fig. 10) is made of
stamped steel and incorporates the Crankcase Venti-
lation (CCV) Hoses and the oil fill opening.
HYDRAULIC TAPPET
DESCRIPTION
Valve lash is controlled by hydraulic tappets
located inside the cylinder block, in tappet bores
above the camshaft.
VALVE GUIDE
DESCRIPTION
The valve guides are integral to the cylinder head,
They are not replaceable. However, they are service-
able.
OIL PAN
DESCRIPTION
The oil pan is made of stamped steel. The oil pan
gasket is a one piece steel backbone silicone coated
gasket.
VALVE STEM SEAL
DESCRIPTION
The valve stem seals are made of rubber and incor-
porate a garter spring to maintain consistent lubrica-
tion control (Fig. 9).
INTAKE MANIFOLD
DESCRIPTION
The intake manifold is made of cast aluminum and
uses eleven bolts to mount to the cylinder head. This
mounting style improves sealing and reduces the
chance of leaks.
Fig. 9 Valve and Keeper Configuration 4.0L Engine
1 – VALVE LOCKS (3–BEAD)
2 – RETAINER
3 – VALVE STEM OIL SEAL
4 – INTAKE VALVE
5 – EXHAUST VALVE
6 – VALVE SPRING
Fig. 10 Cylinder Head Cover
XJ 4.0L ENGINE 9 - 67
DESCRIPTION AND OPERATION (Continued)
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