Engine Mechanical (H4DOTC): Camshaft: Inspection
- Measure the bend, and repair or replace if necessary.
Standard: 0.020 mm (0.0008 in) or less
- Check the journal for damage and wear. Replace if faulty.
- Measure the outside diameter of camshaft journal. If the journal diameter is not within specification, check the oil clearance.CAMSHAFT JOURNAL SPECIFICATION
Camshaft journal Front Center, rear Standard mm (in) 37.946 - 37.963 (1.4939 - 1.4946) 29.946 - 29.963 (1.1790 - 1.1796) - Measurement of the camshaft journal oil clearance:
- Clean the bearing caps and camshaft journals.
- Place the camshafts on cylinder head.
- Place a plastigage across each camshaft journals.
- Gradually tighten the cap in at least two stages in alphabetical sequence shown in the figure, and then tighten to specified torque. Do not turn the camshaft.
Tightening torque:
T1: 9.5 N.m (1.0 kgf-m, 7.2 ft-lb)
T2: 20 N.m (2.0 kgf-m, 14.5 ft-lb)
- Remove the bearing caps.
- Measure the widest point of the plastigage on each journal. If oil clearance exceeds the standard, replace the camshaft. If necessary, replace the camshaft caps and cylinder head as a set.
Standard: 0.037 - 0.072 mm (0.0015 - 0.0028 in)
- Completely remove the plastigage.
- Check the cam face condition; remove the minor faults by grinding with oil stone. Measure the cam height H. If it exceeds the standard or offset wear occurs, replace it.
Cam height H:
Standard
Intake 46.55 - 46.65 mm (1.833 - 1.837 in)
Exhaust 46.75 - 46.85 mm (1.841 - 1.844 in)
Cam base circle diameter A: 37.0 mm (1.457 in)
- Measure the side clearance of the camshaft with a dial gauge. If the side clearance exceeds the standard or there is offset wear, replace the caps and cylinder head as a set. If necessary replace the camshaft.
Standard: 0.068 - 0.116 mm (0.0027 - 0.0047 in)