TROUBLESHOOTING
Page 123
5. If the control valves and springs are OK and
the master and slave pistons were observed
not to be operating, remove the housings for
inspection.
Visually inspect the following:
Master piston springs — If broken or worn,
replace the springs.
Master pistons — Pistons must move freely
in the bore. Check the hard facing on the
master piston for damage; this is the area
that contacts the spherical nut.
Spherical nut rocker adjusting screw —
Check the spherical nut for excessive wear.
If a depression of 0.005 inch or deeper is
found in the top of the spherical nut or if the
pattern of wipe extends beyond the edge of
the nut, replace the spherical nut. Also,
replace the companion master piston. The
spherical end of the rocker adjusting screw
should be checked for proper contour and
smooth appearance. Replace if necessary.
Internal check valve components — If the
housing contains internal check valve
components and a hollow oil supply screw,
remove the check valve components (ball,
spring, retaining ring and washer) from the
housing and replace the hollow oil supply
screw with the current-production screw
containing an integral check valve.
Oil supply screws — Check for damage and
replace if necessary.
6. Check the screw and pin assembly to
ensure that the pin is not bent or damaged.
The pin should not stick in the screw at any
point in its travel. There should be no signs
of mushrooming or other damage where the
slave piston contacts the screw. Check to
ensure that the retainer is in place on the top
of the pin, making the pin captive in the
screw. Replace the screw and pin assembly
as a unit if necessary.
7. Remove and inspect the reset screw. A
spring-loaded plunger located at the bottom
of the screw seals the hole in the slave
piston to provide proper master/slave
operation. A stuck plunger or any debris will
cause the hole in the slave piston to be
uncovered prematurely, dumping oil
pressure and shutting down the circuit. The
reset screw prevents overtravel of the slave
piston and exhaust valve to engine piston
contact.
Reset screw assemblies are not field serviceable.
8. Remove the slave pistons, using the
following procedure.
Wear safety glasses.
The slave piston is retained by springs that
are under heavy compression. If the following
instructions are not followed and proper tools
not used, the springs will be discharged with
enough force to cause personal injury.
J-TECH™ SLAVE PISTON REMOVAL
1. Remove the locknut on the slave piston
adjusting screw. Back out the adjusting
screw until the slave piston is fully retracted
(screw is loose).
2. Place the hole in the slave piston clamp
fixture over the slave piston adjusting screw.
Replace locknut. Finger-tighten to hold
fixture securely.
3. While holding the fixture in position, screw
the holder down over the slave piston until
the spring retainer is contacted.
4. Turn the handle slowly until the retainer is
depressed to about 1/32 inch (1 mm),
relieving pressure against the retaining ring.
5. Remove the retaining ring using retaining
ring pliers. Back out the holder until the
springs are loose, and remove the fixture.
Remove all components, ensuring that there
is no binding or burrs. Clean in an approved
cleaning solvent. Inspect parts and replace
as necessary.
6. A shiny, smooth contact surface on the reset
screw plunger and slave piston is normal. If
a rough surface exists on the plunger and/or
slave piston, replace the parts. There should
be a light spring force on the plunger and it
should move freely. If not, replace the reset
screw assembly.
7. Use the clamp fixture to reinstall the piston
and springs. Be sure the retaining rings are
placed on the retainer before screwing the
clamp holder down.
5-111.bk Page 123 Monday, July 10, 2006 2:26 PM
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