Check the bushing and plate of timing chain for wear. Replace if there is severe wear.
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.
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
syste, of each part of engine.
Faulty HLA.
Remove the cylinder head cover and
press HLA down by hand.
If it moves, replace the HLA.
Timing chain
REASSEMBLY
1. Install the HLA.
2. Align the camshaft timing chain with the intake timing chain sprocket and exhaust timing chain sprocket as
shown in the illustration.
Page 3 of 6
24.04.2008
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