Mitsubishi Colt Ralliart. Manual - part 649
ON-VEHICLE SERVICE
ENGINE MECHANICAL <4G1>
11C-16
<LASH ADJUSTER AIR BLEEDING>
AKX00328
Good
Min.
Max
AE
1. Check the engine oil and replenish or replace the
oil if necessary.
NOTE:
.
•
If there is an only small amount of oil, air will
be drawn in through the oil screen and will get
into the oil passage.
•
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.
•
AK100001
High-pressure chamber
AC
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.
•
AKX00330
Gradually open
the throttle valve
Close the throttle valve
Approximately
3,000 r/min
Idle speed
Once
15 s
15 s
Drive pattern for air breeding
AE
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 close. 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 above 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 above a further 5
times.
5. Run the engine at idle for 1
− 3 minutes and check
that the noise has disappeared.
Main
Index
Group
TOC