Check the camshaft journals for wear. If the journals are badly worn out, replace the camshaft.
Check the cam lobes for damage. If the lobe is damaged or excessively worn out, replace the camshaft.
Cam height |
Standard |
Intake |
3.5 : 35.098 - 35.298 mm (1.3818 - 1.3897 in.) |
3.0 : 34.81 - 35.01 mm (1.3705 - 1.3783 in.) |
Exhaust : 34.81 - 35.01 mm (1.3705 - 1.3783 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 - 0.15 mm(0.0039 - 0.0059 in.) |
Check the lips for wear. If lip threads are worn out, replace the oil seal with new one.
Check a contact surface of oil seal lip on camshaft. If there stratified wear, replace the camshaft.
Problem | Possible cause | Action | |
1. | Temporary noise when starting a cold engine | Normal | This noise will disappear after the oil in the engine reaches the normal pressure. |
2. | Continuous noise when the engine is started after parking more than 48 hours. | Oil leakage of the high pressure chamber on the 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 step 7 below. |
3. | Continuous noise when the engine is first started after rebuilding cylinder head. | Insufficient oil in cylinder head oil gallery. | |
4. | Continuous noise when the engine is started after excessivly craking the engine by the starter motor or band. | Oil leakage of the high-pressure chamber in the HLA, allowing air to get in. Insufficient oil in the HLA. | |
5. | Continuous noise when the engine is running after changing the HLA. | caution Do not run engine at a speed higher than 3000 rpm, as this may damage the HLA. | |
6. | Continuous noise during idle after high engine speed. | Engine oil level too high 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. If deteriorated, replace with specitied type. | ||
7. | Noise cotinues 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 HLA down by hand. If it moves, replace the HLA. warning Be careful with the hot HLAS. | ||
Check auto - lash adjusters for free play by inserting a small wire through the air bleed hole in the rocker arm and push the autolash adjustercheck ball down very lightly.
While lightly holding the check ball down move the rocker arm up and down to check for free play. If there is no play replace the auto - lashadjuster.
