Damage/wear → Replace.
2. Check: camshaft lobes
Blue discoloration/pitting/scratches → Replace the camshaft.
3. Measure: camshaft lobe dimensions (a) and (b)
Out of specification → Replace the camshaft.
Camshaft lobe dimension limit:
- Intake:
- (a) 39.012 mm
- (b) #1: 31.993 mm
- (b) #2: 32.027 mm
- Exhaust:
- (a) 39.045 mm
- (b) 32.100 mm
4. Check: camshaft oil passage
Obstruction → Blow out with compressed air.