Camshaft: Testing and Inspection
CamshaftINSPECTION
1) Measure the bend, and repair or replace if necessary.
Limit: 0.020 mm (0.0008 inch)
2) Check the journal for damage and wear. Replace if faulty.
3) Measure the outside diameter of camshaft journal. If the journal diameter is not as specified, check the oil clearance.
4) Measurement of the camshaft journal oil clearance:
(1) Clean the bearing caps and camshaft journals.
(2) Place the camshafts on cylinder head. (Without installing the valve rocker.)
(3) Place a plastigauge across each of the camshaft journals.
(4) 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: 9.75 Nm (1.0 kgf-m, 7.2 ft. lbs.)
T2: 20 Nm (2.0 kgf-m, 14.5 ft. lbs.)
(5) Remove the bearing caps.
(6) Measure the widest point of plastigauge on each journal. If the oil clearance exceeds the standard value, 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 inch)
Limit: 0.10 mm (0.0039 inch)
(7) Completely remove the plastigauge.
5) Check the cam face condition; remove the minor faults by grinding with oil stone. Measure the cam height H. replace if the limit has been exceeded.
Cam height H:
Standard: Intake: 46.25 - 46.35 mm (1.821 - 1.825 inch)
Exhaust: 46.25 - 46.35 mm (1.821 - 1.825 inch)
Limit:
Intake: 46.15 mm (1.817 inch)
Exhaust: 46.15 mm (1.817 inch)
Cam base circle diameters: 37.0 mm (1.457 inch)
6) Measure the thrust clearance of camshaft with dial gauge. If the clearance exceeds the standard value, replace the caps and cylinder head as a set. If necessary, replace the camshaft.
Standard: 0.068 - 0.116 mm (0.0026 - 0.0045 inch)