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REPAIR INSTRUCTIONS
EXHAUST VALVE ADJUSTMENT
Refer to Figure 330.
Exhaust valve clearance is 0.024 inch
(0.610 mm).
When checking the exhaust valve adjustment as
part of a troubleshooting routine, the acceptable
range is 0.020–0.028 inch (0.508–0.711 mm). Do
NOT readjust the lash clearance unless it is
outside of this range.
1. Place a 0.024-inch (0.610-mm) thickness
gauge between the rocker arm and yoke on
the No. 1 cylinder.
2. Turn the adjusting screw until a light drag is
felt on the thickness gauge.
3. After adjustment is complete, tighten jam nut
to specification, 40 lb-ft (54 N•m), using
torque wrench J 24407, or equivalent.
Do not allow the adjustment screw to turn.
The J-Tech™
exhaust rocker arm adjusting screw
spherical jam nut is a through-hardened nut.
When tightening these nuts, be aware of the
following:
r
Always use the proper 20-mm size wrench.
Using an improper size wrench to tighten the
jam nuts can lead to jam nut breakage.
r
Overtightening the jam nut when adjusting
valves may result in jam nut breakage. If
there is too much or too little drag on the
thickness gauge, loosen the jam nut and
reading valve lash.
4. Recheck valve lash clearance after
tightening jam nut. Readjust as necessary.
330
Figure 330 — Exhaust Valve Adjustment
1. Spherical Jam Nut
2. Thickness Gauge
3. Valve Yoke
5_106_00.bk Page 302 Friday, August 4, 2000 11:17 AM
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