Check the camshaft journals for wear. If the journals are badly worn, replace the camshaft.
Check the cam lobes for damage. If the lobe is damaged or worn excessively, replace the camshaft.
Standard value
Intake : 43.4484 mm (1.7106 in.)
Exhaust : 43.8489 mm (1.7263 in.)
Limit
Intake : 42.9484 mm (1.6909 in.)
Exhaust : 43.3489 mm (1.7066 in.)
Check the cam surface for abnormal wear or damage, and replace if necessary.
Check each bearing for damage. If the bearing surface is excessively damaged, replace the cylinder head assembly or camshaft bearing cap, as necessary.
Camshaft end play : 0.1 - 0.2 mm (0.0039 - 0.0079 in.)
Check the lips for wear. If the lip threads are worn, replace.
Check the oil seal lip contacting surface of the camshaft. If it is worn, replace the camshaft.
Problem | Possible cause | Action |
Temporary noise on starting a cold engine. | Normal | This noise will disappear after the oil in the engine has reached normal pressure. |
Continuous noise when engine is running after sitting more than 48 hours. | Oil leakage of the high pressure chamber on HLA, allowing air to get in. | Noise will disappear within 15 minutes when engine runs at 2000~3000 rpm If it doesn't disappear, refer to item 7 below |
Continuous noise when engine is first started after rebuilding cylinder head. | Insufficient oil in cylinder head oil gallery. | |
Continuous noise when engine is running after excessive cranking. | Oil drain out of the high-pressure chamber in HLA, allowing air to get in. Insufficient oil in HLA. | |
Continuous noise when engine is running after changing HLA. | caution Do not run engine at a speed higher than 3000 rpm as this may damage HLA. | |
Continuous noise during idle after high speed running. | Engine oil level toohigh or too low. | Check oil level. Drain or add oil as necessary. |
Excessive amount of air in the oil at high engine speed. | Check oil supply system | |
Deteriorated oil | Check oil quality. | |
Noise continuous for more than 15 minutes. | Low oil pressure | Check oil pressure and oil supply system of each part of engine |
Faulty HLA. | Remove the cylinder head cover and press down on the HLA by hand. If it move, replace HLA. caution Be careful of hot HLA. |
