Camshafts

Camshafts









Removal

NOTICE: Do not loosen or remove the crankshaft pulley bolt without first installing the special tools as instructed in the crankshaft pulley procedure. The crankshaft pulley and the crankshaft timing sprocket are not keyed to the crankshaft. The crankshaft, the crankshaft sprocket and the pulley are fitted together by friction, using diamond washers between the flange faces on each part. For that reason, the crankshaft sprocket is also unfastened if the pulley bolt is loosened. Before any repair requiring loosening or removal of the crankshaft pulley bolt, the crankshaft and camshafts must be locked in place by the special tools, otherwise severe engine damage may occur.

1. Remove the timing chain and sprockets. For additional information, refer to Timing Drive Components Removal and Replacement.

2. Remove the Camshaft Alignment Plate.





3. NOTICE: Failure to follow the camshaft loosening procedure may result in damage to the camshafts.

NOTE: Mark the location and orientation of each camshaft bearing cap.

NOTE: Note the position of the lobes on the No. 1 cylinder before removing the camshafts for assembly reference.

Remove the camshafts from the engine.

- Loosen the 20 camshaft bearing cap bolts, in sequence, one turn at a time.

- Repeat the first step until all tension is released from the camshaft bearing caps.

- Remove the 10 camshaft bearing caps.

- Remove the 2 camshafts.





Installation

1. NOTICE: Install the camshafts with the alignment slots in the camshafts lined up so the Camshaft Alignment Plate can be installed without rotating the camshafts. Make sure the lobes on the No. 1 cylinder are in the same position as noted in the removal procedure. Rotating the camshafts when the timing chain is removed, or installing the camshafts 180 degrees out of position, may cause severe damage to the valves and pistons.

NOTE: Lubricate the camshaft journals and bearing caps with clean engine oil prior to installation.

Position the camshafts and bearing caps in their original location and orientation. Loosely install the 20 bolts and tighten the bearing caps in the sequence shown in 3 stages:

- Stage 1: Tighten the camshaft bearing cap bolts one turn at a time until snug.

- Stage 2: Tighten the bolts to 7 Nm (62 lb-in).

- Stage 3: Tighten the bolts to 16 Nm (142 lb-in).





2. Install the timing chain and sprockets. For additional information, refer to Timing Drive Components Removal and Replacement.