REPAIR INSTRUCTIONS, PART 3
Page 455
Valve Yoke Adjustment Procedure
(PowerLeash™ Brake Engines)
Yoke adjusting screws used with the
PowerLeash™ brake have a screwdriver slot at
the top.
1. Loosen the engine brake hydraulic actuator
adjusting screw locknut (located on the push
rod end of the exhaust rocker arm) and back
the adjusting screw out several turns.
561
Figure 561 — Loosening Hydraulic Actuator Locknut
and Backing Out Adjusting Screw
2. Loosen the exhaust valve yoke screw
locknut.
562
Figure 562 — Loosening Exhaust Valve Yoke Adjusting
Screw Locknut
3. Exert moderate force on the exhaust valve
yoke by pressing on the end of the exhaust
rocker arm above the yoke. Turn the yoke
adjusting screw clockwise until it solidly
contacts the outboard valve stem tip (a light
drag should be felt on the adjusting screw).
563
Figure 563 — Turning the Exhaust Valve Yoke Adjusting
Screw Until it Contacts Valve Stem
4. After the adjusting screw solidly contacts the
valve stem tip, turn the screw clockwise an
additional 30 degrees.
A 30-degree turn is equal to 1/2 of a flat on the
adjusting screw jam nut.
564
Figure 564 — Turning Adjusting Screw an Additional
30-Degree Turn
5-111.bk Page 455 Monday, July 10, 2006 2:26 PM
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