Valves; Valve Spring; Cylinder Head Cover; Hydraulic Tappet - Jeep cherokee 2000 Service Manual

XJ
DESCRIPTION AND OPERATION (Continued)

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).
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

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.
Fig. 10 Cylinder Head Cover

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.
4.0L ENGINE 9 - 67