DESCRIPTION AND OPERATION
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Figure 29 — PowerLeash™ Exhaust Rocker Arm — Components
The rocker arms are sturdier than standard, and
they are equipped with blade springs. The rocker
arms also contain a one-way valve and a plunger.
The one-way valve remains open while the
accelerator pedal is depressed. Oil flows either
way.
The blade spring maintains positive contact
between the plunger and the yoke at all times. On
deceleration, pressure (increased by the oil
control valve) causes the one-way valve to close
raising the pressure on the plunger. The plunger
moves to set and maintain zero valve clearance.
System Oil Pressure
RPM Temperature Pressure
600 90–110°C
(194–230°F)
>250 kPa
(>36 psi)
>1100 90–110°C
(194–230°F)
300–550 kPa
(44–80 psi)
>1100 Cold Engine 650 kPa
(94 psi)
Camshaft Oil Pressure
Engine Brake RPM Pressure
Active 900–2300 220 kPa
(32 psi)
Inactive — 80–120 kPa
(12–17 psi)
1. Camshaft
2. Exhaust Cam Profile
3. Charging Cam Profile — Induction Stroke
4. Decompression Cam Profile — Compression Stroke
5. Exhaust Rocker Arm
6. Blade Spring
7. One-Way Valve
8. Plunger
9. Adjustment Shim
10. Pressure Relief Valve
11. Yoke, Exhaust Valve
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