5 6 Figure 5 — Valve Train (with PowerLeash™) Figure 6 — Camshaft and Rocker Arms (with PowerLeash™) Timing marks on the camshaft provide for valve and injector adjustment. PowerLeash™ includes its own electronic control governed by driver's choice through a switch near the steering wheel. This control mounts on the cylinder head between the No. 3 and No. 4 cylinder rocker arms. The wiring harness includes additional wire leads for PowerLeash™. 7 Exhaust valve yokes include a shim for adjustment. Replaceable valve guides and seats are made of alloyed cast iron and steel respectively. All valve guides have oil seals. Exhaust valves have double valve springs.
Rollers in the ends of the rocker arms contact the cam shaft. The contacts with the yokes have ball sockets for flexibility. The camshaft is induction-hardened. Timing marks for valve and injector adjustment are located on the flange forward of the No. 1 camshaft journal. These marks are for adjusting valve clearance. They do not apply to camshaft timing. Camshaft thrust washers are integral on the No. 7 journal bearing. Smooth rotation is ensured by means of a vibration damper on the camshaft gear. Teeth on the damper interact with the camshaft position sensor for input to the EECU. Figure 7 — MP8 Engine Timing Marks — Camshaft Front End Page 17 DESCRIPTION AND OPERATION 1.
Inlet Valve Yoke (Bridge) 2. Inlet Valve Rocker Arm 3. Injector Rocker Arm 4. Exhaust Valve Rocker Arm 5. PowerLeash™ Rocker Arm 6. Exhaust Valve Yoke (Bridge) 7. Shim Retaining Screw 1. Engine Brake Cam 2. Exhaust Cam 3. Injector Cam 4. Inlet Cam