REPAIR INSTRUCTIONS
Page 203
INLET AND EXHAUST VALVE
IDENTIFICATION
To permit positive identification, exhaust valve
has two stem grooves and inlet valve has one
stem groove in addition to the valve spring keeper
groove.
The valves are also identified by the letter “J”
(20-degree inlet), and letters “EX” (exhaust), on
the bottom face of the valve head. Refer to
Figure 210 for an illustration of the inlet valve
identification.
210
Figure 210 — 20-Degree Intake Valve Identification
VALVE INSTALLATION
The inlet and exhaust valve head diameters are
nearly the same size. It is important, therefore,
that extra care be taken when installing these
valves.
With the new, more effective valve stem seals
(P/N 446GC328), pre-lubing the seals and valve
stems during installation is extremely important.
Perform the following:
r
Valve Stem-to-Guide — If valves are
removed, lubricate the inside diameter of the
valve guides by using a “bottle brush” coated
with Dow Corning
®
BR2 Plus multipurpose
grease. This is particularly important when
both the valves and the valve guides are
new. With an on-engine seal replacement,
pre-lube the valve stems with clean engine
oil while moving the valve up and down,
prior to installation of the valve spring.
r
Valve Stem-to-Seal Lip — The inside
diameter of the seal lip and outside diameter
of the valve stem should be well-lubricated
with clean engine oil when installing the seal
over the valve stem.
It is essential that the J 42453 Valve Stem Seal
Installation tool be used to install the seals. This
tool bottoms on the cylinder head rocker arm
mounting bracket surface when the seal is
installed to the proper depth on the valve guide.
Using any non-bottoming type seal driver (such
as a socket) may result in distorting the top
surface of the seal casing which permanently
distorts the seal lip and prevents proper sealing. It
can also result in the top rubber portion of the
seal being cut off.
1. Lubricate the valve guides and valve stems
with clean engine oil prior to installation.
2. Install the valve spring lower washer
(Roto-Coil) over the valve guide.
5_106_00.bk Page 203 Friday, August 4, 2000 11:17 AM
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