3306 and 3304 Engines – Finding Top Center Compression Position for No. 1 Piston

For Engines With Timing Pointer

5P7307 Engine Turning Tool Group.

No. 1 piston at top center (TC) on the compression stroke is the starting point for all timing procedures.

NOTE: The engine is seen from the flywheel end when direction of crankshaft rotation is given.

1. Remove starter motor.

2. Install tooling as shown.

ENGINE TURNING TOOLS INSTALLED
1. 5P7306 Housing. 2. 5P7305 Gear.

3. To find top center compression stroke for No. 1 piston, first turn the flywheel clockwise (opposite the direction of engine rotation) approximately 30 degrees. The reason for making this step is to be sure the play is removed from the timing gears when the engine is put on top center.

4. Turn the flywheel counterclockwise until the mark TC 1 on the flywheel is in alignment with the timing pointer (3). The No. 1 piston is on top center.

NOTE: If the TC 1 mark on the flywheel is turned beyond the timing pointer in the flywheel housing, turn the flywheel back (clockwise) a minimum of 30° before turning counterclockwise toward alignment again.

FINDING TOP CENTER
3. Timing pointer (in alignment with mark on flywheel).

5. To see if No. 1 piston is on the compression stroke, look at the valves of No. 1 cylinder. The valves will be closed if No. 1 cylinder is on the compression stroke. You should be able to move the rocker arms (4) up and down with your hand.

VALVE COVER REMOVED
4. Rocker arms.

6. If No. 1 piston is not on the compression stroke, turn the flywheel 360° counterclockwise and bring the TC 1 & 6 cyl. mark in alignment with the timing pointer again.

For Engines With Timing Bolt Hole

5P7307 Engine Turning Tool Group.

No. 1 piston at top center (TC) on the compression stroke is the starting point for all timing procedures.

NOTE: The engine is seen from the flywheel end when direction of crankshaft rotation is given.

1. Remove starter motor.

2. Install tooling as shown.

ENGINE TURNING TOOLS INSTALLED
1. 5P7306 Housing. 2. 5P7305 Gear.

3. To find top center (TC) compression stroke for No.1 piston, first turn the flywheel clockwise (opposite the direction of engine rotation) approximately 30 degrees. The reason for making this step is to be sure the play is removed from the timing gears when the engine is put on top center.

4. Remove the plug (3). Turn the flywheel counterclockwise until a 3/8″ – 16NC bolt can be installed in the flywheel through the hole in the flywheel housing. The No. 1 piston is on top center.

NOTE: If the flywheel is turned beyond the point where the 3/8″-16 NC bolt (3) can be installed in the flywheel turn the flywheel back (clockwise) a minimum of 30° before turning counterclockwise toward alignment again.

LOCATION OF TIMING HOLE
3. Plug.

5. To see if No.1 piston is on the compression stroke, look at the valves of No. 1 cylinder. The valves will be closed if No. 1 cylinder is on the compression stroke. You should be able to move the rocker arms (4) up and down with your hand.

VALVE COVER REMOVED
4. Rocker arms.

6. If No.1 piston is not on the compression stroke, remove the 3/8″-16 NC bolt and turn the flywheel 360° counterclockwise. Install the 3/8″-16 NC bolt as before. The No.1 piston is now at top center on the compression stroke (TC1).

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