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2. Using a mirror, locate the TDC arrow on the front cover. Rotate the crankshaft until the mark on the crankshaft damper (2) is aligned with the TDC arrow on the front cover (2). The engine is now at TDC. 3. Note the location of the V6 mark stamped into the camshaft drive gears (1,2). If the V6 mark on each camshaft drive gear is at the twelve o’clock position, the engine is at TDC on the exhaust stroke. If the V6 mark on each 4. If both of the camshaft drive gears are off in the same or opposite directions, the primary chain or both second- ary chains are at fault. Refer to Timing Chain and Sprockets procedure in this section. 5. If only one of the camshaft drive gears is off and the other is correct, the problem is confined to one secondary chain. Refer to Single camshaft timing, in this procedure. 6. If both camshaft drive gear V6 marks are at the twelve o’clock or the six o’clock position the engine base timing is correct. Reinstall the cylinder head covers. COUNTER BALANCE SHAFT TIMING 1. Ensure that the engine is at TDC with both cam- shaft sprocket V6 marks in the 12 o’clock position. 2. Look down the left cylinder head chain cavity. The timing dot (2) on the counter balance shaft drive 9 - 1570 ENGINE - 3.7L KJ |