REPAIR INSTRUCTIONS, PART 2
Page 283
Preliminary Steps
Remove the following components to gain
access to the valve stem seals (see ENGINE
DISASSEMBLY for procedures):
앫 Cylinder Head Cover
앫 Rocker Arm Shaft Assembly
앫 Unit Injectors
Seal Removal
When replacing the valve stem seals, the pistons
must be at TDC when the valves are released so
that the valves do not drop into the cylinder.
1. Using the flywheel turning tool, 9996956,
rotate the crankshaft so that the pistons are
at TDC for the appropriate pair of cylinders
where stem seals are being replaced.
418
Figure 418 — Flywheel Turning Tool, Installed
2. Using the valve spring compressor tool,
9990210, press down on the springs (one at
a time) and remove the valve retainers and
springs for the cylinder.
419
Figure 419 — Compressing Valve Springs
3. Remove and discard the valve stem seals.
4. Using a clean cloth, thoroughly clean all
engine oil off the valve stem and valve guide.
Seal Installation
1. Place the seal protection tool, 88800011, in
position on the valve stem.
2. Place a new valve stem seal in position over
the protection tool and onto the valve stem.
The valve stem seal must be dry when installed.
3. Using the seal installation tool, 85112460,
seat the valve stem seal on the valve guide.
Ensure that the seal is pressed all the way
down so that the bottom of the seal is in full
contact with the valve guide.
420
Figure 420 — Seating the Valve Stem Seal
1. Valve Spring Compressor 9990210
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