Sebring V6-2.5L VIN N (1997)
Lifter / Lash Adjuster: Testing and Inspection
Checking Abnormal Noise
NOTE: If an abnormal noise (rattling noise) probably caused by the lash adjusters is heard and the noise does not stop, check as follows.
1. Check the engine oil, and if required, add or change oil.
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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 crankshaft 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.
NOTE: If the air which has mixed in the oil due to the above causes enters the high-pressure chamber in the lash adjusters, the air in the
high-pressure chamber will be pressurized during 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* several times (less than 10 times.). If the abnormal noise stops by racing, 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 idling 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 lash 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.
