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Page 290
REPAIR INSTRUCTIONS
5. Taking care not to damage camshaft or
bushings, pull the camshaft out of the front
of the engine. Carefully guide rear of the
shaft through the journals. If the shaft does
not come out freely, ensure that all valve
lifters are clear of the camshaft cams and
journals.
6. Remove and inspect the valve lifters.
Valve lifters have established wear patterns and
should be reinstalled in same locations. Label
each valve lifter upon removal and place on a
clean work surface.
CAMSHAFT INSTALLATION
General Instructions
Before installing a camshaft in any engine,
ensure that cam is clean. Parts that are free of
dirt/contamination and are well-lubricated with
clean engine oil are essential for initial start-up
and run-in. If necessary, wash and brush the
camshaft in solvent and blow-dry with
compressed air. Also, check the camshaft for
possible handling burrs on the edges of journals
and lobes. Any minor burrs can be removed with
a fine stone.
Use camshaft guide tool J 41682 to ease
installation of the camshaft and avoid damage to
the camshaft bushings.
Procedure
Install the camshaft as follows:
In order to use the valve lifter tool to hold the
valve lifters in position, the cylinder heads must
be installed on the engine.
Arrange valve lifters in order identified so that
they can be reinstalled back into the same hole.
1. Apply a generous coating of clean engine oil
to the valve lifters.
2. Install a lifter into the lifter bore by aligning
the lifter flats with the H-ring flats. As the
lifter is seated, it should be possible to rotate
it slightly from left to right.
With the engine in the chassis, the valve lifters
must be held in the UP position, using tappet
holders J 37720-C in combination with J 42425.
3. As the lifter is installed, it must be held in
position by inserting a tappet holder into the
opening through the top of the cylinder head
and block. The tappet holder must be
positioned so that the magnetic head of the
tool holds the lifter in position. Check to see
if the tool has captured the valve lifter by
drawing upward on the tool. A resistance will
be felt that cannot be felt if the magnet has
contacted something other than a valve
lifter.
4. Secure the lifter in the UP position with
grommets provided with the tappet holders.
The holding tool shafts of two adjacent valve
lifters can be prevented from dropping by
wrapping a rubber band around the two
shafts. This draws the shafts together and
holds them in position. Refer to Figure 315.
5. Repeat steps 2 through 4 to install each of
the remaining valve lifters.
6. Apply a generous coating of clean engine oil
to camshaft bushings.
7. Clean camshaft with a suitable solvent.
Make sure the captured thrust washer and
camshaft gear are properly installed on the
camshaft.
8. Install the camshaft installation guide tool
over the large flat of the injector lobe,
between the last two cam journals (journals
at back of shaft).
9. Apply clean engine oil to the installation
guide.
5_106_00.bk Page 290 Friday, August 4, 2000 11:17 AM
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