Mitsubishi 4G6 series Specifications download pdf (Page 49)

ENGINE <6A1> -

On-vehicle Service

ENGINE <6A1> -

On-vehicle Service

11B-13

1. Check the engine oil and replenish or replace the oil

if necessary.

NOTE

(1) If there is a only small amount of oil, air will be drawn

in through the oil screen and will get into the oil

passage.

(2) If the amount of oil is greater than normal, then the

oil will being mixed by the crankshaft and a large

amount of air may get mixed into the oil.

(3) If the oil is degenerated, air and oil will not separate

easily in oil, and the amount of air mixed into the

oil will increase.

(4) If the air which has been mixed in with the oil due

to any of the above reasons gets into the high pressure

chamber of the lash adjuster, the air inside the high

pressure chamber will be compressed when the valve

is open and the lash adjuster will over-compress,

resulting in abnormal noise when the valve closes.

This is the same effect as if the valve clearance is

adjusted to be too large by mistake. If the air inside

the lash adjusters is then released, the operation

of the lash adjusters will return to normal.

2. Run the engine at idle for 1 - 3 minutes to let it warm

up.

3. With no load on the engine, repeat the drive pattern shown

in the illustration at left and check if the abnormal noise

disappears. (The noise should normally disappear after

10 - 30 repetitions, but if there is no change in the noise

level after 30 repetitions or more, the problem is probably

not due to air inside the lash adjusters.)

4. After the noise has disappeared, repeat the drive pattern

shown in the illustration at left a further 5 times.

5. Run the engine at idle for 1 - 3 minutes and check that

the noise has disappeared.

Good

High

pressure

chamber

Gradually open the

throttle valve.

Drive pattern for air bleeding

Close the throttle

valve.

Approx.

3,000 r/min.

seconds

Idle speed

Once

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Mitsubishi 4G6 series Specifications Page 49

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