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Bridge Adjustment Crankshaft Positions for Valve
ENGINE ROTATION
SAE standard engine crankshaft rotation is counterclockwise as seen from the flywheel end of the engine.
FINDING TOP CENTER POSITION FOR NO. 1 PISTON
Tools Needed: 9S9082 Engine Turning Tool.
TIMING BOLT LOCATION 1. Cover. 2. Timing bolt. 3. Timing bolt hole In flywheel housing.
1. Remove cover (1) and the timing hole plug from the right front side of the flywheel housing. On some engines there is a cover and timing bolt hole located on the left side, also.
2. Put timing bolt (2) [long bolt that holds cover (1) on the flywheel housing] through the timing hole in the flywheel housing. Use the 9S9082 Engine Turning Tool (4) and 1/2" drive ratchet wrench to turn the engine flywheel in the direction of normal engine rotation until the timing bolt engages with the threaded hole in the flywheel.
NOTE: If the flywheel is turned beyond the point that the timing bolt engages in the threaded hole, the flywheel must be turned opposite normal engine rotation approximately 30 degrees. Then turn the flywheel in the direction of normal engine rotation until the timing bolt engages with the threaded hole. The reason for this procedure is to make sure the play is removed from the gears when the No. 1 piston is put on top center.
3. Remove the valve cover for the No. I cylinder head. TIMING BOLT INSTALLATION 2. Timing bolt. 4. 9S9082 Engine Turning Tool.
4. The intake and exhaust valves for the No. 1 cylinder are fully closed if No. 1 piston is on the compression stroke and the rocker arms can be moved by hand. If the rocker arms can not be moved and the valves are slightly open, the No. 1 piston is on the exhaust stroke. Make reference to charts for CRANKSHAFT POSITIONS FOR INJECTOR TIMING AND VALVE CLEARANCE SETTING to find the correct cylinder(s) to be checked/adjusted for the stroke position of the crankshaft when the timing bolt has been installed in the flywheel.
NOTE: When the actual stroke position is identified, and the other stroke position is needed, it is necessary to remove the timing bolt from the flywheel and turn the flywheel 3600 in the direction of normal engine rotation.
CYLINDER AND VALVE LOCATION (3512 SHOWN)
