Talon AWD L4-1997cc 2.0L DOHC Turbo VIN F SMFI (1997)
Lash Adjuster: Testing and Inspection
Checking Abnormal Noise
If an abnormal rattling noise is heard, (probably caused by the lash adjusters), and the noise does not stop, check as follows:
1. Check the engine oil, and if required, refuel or replace it.
NOTE:
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If the amount of the engine oil is insufficient, air will be sucked in from the oil strainer and mix in the oil passage.
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If the amount of the engine oil is more than the specified amount, it will be stirred by the crank to make a lot of air mix in the oil.
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If the oil is deteriorated, it will not easily separate from air and the amount of air mixed in the oil will increase.
If the air has mixed with the oil, due to the above, and enters the high pressure chamber in the lash adjusters, the air in the high pressure chamber
will be pressurized during the opening of the valve, which causes the lash adjusters to shrink excessively, and an abnormal noise will be generated
when the valve is closed. This is the same phenomenon as the one when the valve clearance has been excessively adjusted by mistake. In this case,
if the air which has entered the lash adjusters is bled, things will be normalized.
2. Start the engine and perform gentle racing of the engine several times (less than 10 times.) If the abnormal noise stops by racing the engine, the air
is bled from the high pressure chamber of the lash adjusters and the function of the lash adjusters is normalized. After raising the engine speed
from idle to 3,000 RPM gradually in 30 seconds, drop the speed gradually in 30 seconds to idling.
NOTE:
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If the vehicle is parked on a slope for long, the oil in the lush adjusters will be decreased and air may enter the high pressure chamber when the
vehicle is started.
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After the vehicle is parked for long, air may enter the high pressure chamber because the oil in the oil passage will be gone and it will take a
time before the oil is supplied to the lash adjusters.
3. If an abnormal noise does not stop by racing, check the lash adjusters according to the following procedures.
(a) Stop the engine.
(b) Set the No. 1 cylinder of the engine to the compression top dead center.
(c) Push the rocker arm indicated by the white arrow mark as shown in the illustration and check whether or not the arm lock goes down.
(d) Turn slowly the crankshaft 360° clockwise.
(e) Check the rocker arm indicated by the black arrow mark as shown in the illustration at left same as above (c).
