Camshaft: Testing and Inspection
Inspection1. 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 within standard, check the oil clearance.
4. Measurement of the camshaft journal oil clearance
a. Clean the bearing caps and camshaft journals.
b. Place the camshafts on cylinder head. (Without installing the valve rocker.)
c. Place a plastigauge across each of the camshaft journals.
d. 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, 14.8 ft. lbs.)
e. Remove the bearing caps.
f. Measure the widest point of the plastigauge on each journal. If the oil clearance exceeds the limit, replace the camshaft. If necessary, replace the camshaft caps and cylinder head as a set.
Standard. 0.037 - 0.072 mm (0. 00 15 - 0.0028 inch)
Limit: 0.10 mm (0. 0039 inch)
g. Completely remove the plastigauge.
5. Check the cam face condition, and remove the minor faults by grinding with oil stone. Measure the cam height H. If it exceeds the limit or offset wear occurs, replace the camshaft.
Cam height H.
Standard
Intake 46.55 - 46.65 mm (1.833 - 1.837 inch)
Exhaust 46.75 - 46.85 mm (1.841 - 1.844 inch)
Limit Intake 46.45 mm (1.829 inch)
Exhaust 46.65 mm (1.837 inch)
Cam base circle diameter 37.0 mm (1.457 inch)
6. Measure the thrust clearance of camshaft with dial gauge. If the thrust clearance exceeds the limit or offset wear occurs, replace the caps and cylinder head as a set. If necessary, replace the camshaft.
Standard. 0.068 - 0.116 mm (0.0027 - 0.0046 inch)
Limit. 0. 14 mm (0. 0055 inch)
