G3516 TA Engine Caterpillar

Timing Check

Illustration 1	g00284801
Location of timing pins (typical example) (1) Timing hole (2) Timing pin

1. Remove rear camshaft covers from both sides of the engine.

2. Refer to Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston".

   Note: When the timing bolt is installed in the flywheel, it is not necessary to remove the No. 1 valve cover to find the compression stroke. Both rear camshaft covers must be removed to check the timing.

3. When the timing bolt is installed in the flywheel, look at the rear end of the camshaft. If the timing ring is visible, then the No. 1 piston is on the compression stroke. If the timing ring is not visible, feel the back of the camshaft for the groove. If the groove is at the back of the camshaft, the flywheel must be turned by 360 degrees to put the No. 1 piston on the compression stroke.
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   Illustration 2	g00284802
   Installation of timing pins (typical example) (2) Timing pin (3) RH Camshaft

4. When the timing bolt is installed in the flywheel and the No. 1 piston is on the compression stroke, remove timing pins (2) from the storage positions.

5. Install timing pins (2) through timing holes (1) in the engine block. Install timing pins (2) into the groove in camshaft (3) on each side of the engine. To time the engine correctly, the timing pins must fit into the groove of each camshaft.

   If the timing pins do not engage in the grooves of both camshafts, the engine is not in time, and one or both camshafts must be adjusted.

6. Proceed to the Test and Adjust , "Valve Lash and Valve Bridge Adjustment" procedure.