Cylinder Head and Valves Remove Rocker Arm Assembly CAUTION: After operating engine, allow exhaust system to cool before servicing engine. 02 020 1. Remove rocker arm cover. 10 RG8262B –UN–06DEC97 2. Lock camshaft and crankshaft at TDC of No.1 cylinder’s compression stroke. 3. Remove electronic unit injector wiring harness from rocker arm shaft clamps. Removing Valve Bridge and Push Tubes IMPORTANT: ALWAYS loosen all intake, exhaust and EUI rocker arm adjusting screws before removal or installation of rocker arm assembly to relieve pressure. This allows for a more uniform rocker arm cap screw clamp load and reduces the possibility of damage to valve train components.
RG8459A –UN–21JUL99 Remove push tubes and valve bridges immediately after relieving rocker arm pressure. Push tubes can fall into oil drain opening of cylinder head causing oil pan removal to retrieve tubes. Removing Rocker Arm Assembly with JDG970A 4. Loosen EUI, intake, and exhaust valve rocker arm adjusting screw lock nut and relieve pressure at all locations. A—Rocker Arm Shaft Oil Tubes (Dual Rail Fuel System Only) B—Rocker Arm Lifting Fixture C—Push Tubes D—Valve Bridges 5. Remove push tubes (C) and valve bridges (D) from all valve stems. 6. Remove two rocker arm shaft oil tubes (A) (dual rail system only). Remove rocker arm shaft hold-down clamps. IMPORTANT:
Rocker arm shaft hold-down clamp cap screws can not be reused. Use new cap screws for reassembly. 7. Install shaft clamp cap screw in end hole of each rocker arm shaft so that rocker arms do not slide off shaft when lifted. CTM100 (06APR04) 02-020-10 P OWER T ECH 10.5 L & 12.5 L Diesel Engines Continued on next page RG,RG34710,64 –19–21DEC00–1/2 040604 PN=82