Camshaft: Service and Repair
CAMSHAFTS
Removal
Caution:
^ During engine repair procedures, cleanliness is extremely important. Any foreign material, including any material created while cleaning gasket surfaces, that enters the oil passages, coolant passages or the oil pan can cause engine failure.
Caution:
^ 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 you loosen the pulley. Therefore, the engine must be retimed each time the damper is removed. Otherwise severe engine damage can occur.
1. With the vehicle in NEUTRAL, position it on a hoist.
2. Remove the camshaft timing sprockets.
3. Mark the position of the camshaft lobes on the No. 1 cylinder for assembly reference.
Caution:
^ Failure to follow the camshaft loosening procedure can result in damage to the camshafts.
4. Remove the camshafts from the engine.
^ Loosen the camshaft bearing bolts in the sequence shown, one turn at a time. Repeat until all the tension is released.
^ Remove the camshaft bearing caps.
^ Remove the camshafts.
Installation
Caution:
^ 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 can cause severe damage to the valves and pistons.
Note:
^ Lubricate the camshaft journals and bearing caps with clean engine oil.
1. Install the camshafts and bearing caps. Tighten the bolts in the sequence shown in three stages.
^ Stage 1: Tighten the camshaft bearing bolt caps one turn at a time until tight.
^ Stage 2: Tighten the bolts to 7 Nm (0.7 kgf-m, 62 inch lbs.).
^ Stage 3: Tighten the bolts to 16 Nm (1.6 kgf-m, 12 ft. lbs.).
2. Install the camshaft timing sprockets.