Page 172
REPAIR INSTRUCTIONS, PART 1
INSPECTION
Worn valve guides may result in poor valve to
seat contact, valve damage or excessive oil
consumption.
1. Inspect the valve guides for wear, damage,
cracks and looseness.
2. Using a suitable gauge, measure the inside
diameter of each guide.
3. Using a suitable gauge, measure the valve
guide extension.
When reconditioning the cylinder head, it is
recommended that all valve guides be replaced.
VALVE GUIDE INSTALLATION
1. Cool valve guide to minus 60–200°C
(76–328°F) using dry ice or equivalent.
Lubricate cylinder head valve guide bore
before installation.
2. Using protective gloves, place a new valve
guide in position on the cylinder head.
3. Assemble the hydraulic ram, 9809729, press
tool, 9990176, pump 99996222, and the
appropriate valve guide installer (88800062
for inlet and exhaust) on top of the cylinder
head.
4. Oil the outside of the guide before
installation.
5. Using the press tool setup, press the valve
guide into its bore from the top of the
cylinder head.
It is essential that the correct valve guide
installation tool (88800062 for inlet and exhaust)
be used to install the current valve guide. If the
incorrect tool is used, the valve guide and seal
installed height will be incorrect and may result in
premature failure of the components.
6. Thoroughly clean all debris from the valve
guides and surrounding area.
7. Install the valves in the cylinder head and
check for binding, looseness and other
conditions that may result in premature valve
or valve guide failure.
Valve Spring Inspection
[213 MB]
If the inside surface of a spring coil is rough or
grooved, it must be replaced.
If spring strength is not within specifications, it
must be replaced.
For indications of grooving or roughness:
1. Inspect the inside surfaces of each spring
coil visually.
2. Feel the inside surfaces of each spring coil
with a finger.
To Next Page
Loading...
