Lash Adjuster Check - Mitsubishi Pajero Pinin 1999 Workshop Manual

ENGINE <4G9-GDI> ±

LASH ADJUSTER CHECK

If an abnormal noise (knocking) that seems to be coming
from the lash adjuster is heard after starting the engine and
does not stop, carry out the following check.
NOTE
(1) The abnormal noise which is caused by a problem
(2) If there is a problem with the lash adjusters, the noise
1. Start the engine.
2. Check that the noise occurs immediately after the engine is
started, and that the noise changes in accordance with
changes in the engine speed.
If the noise does not occur immediately after the engine is
started, or if it does not change in accordance with the
engine speed, the problem is not being caused by the lash
adjusters, so check for some other cause of the problem.
Moreover, if the noise does not change in accordance with
the engine speed, the cause of the problem is probably not
with the engine. (In these cases, the lash adjusters are
normal.)
3. While the engine is idling, check that the noise level does
not change when the engine load is varied (for example,
by shifting from N
If the noise level changes, the cause of the noise is probably
parts striking because of worn crankshaft bearings or
connecting rod bearings. (In such cases, the lash adjusters
are normal.)
4. After the engine has warmed up, run it at idle and check
if any noise can be heard.
If the noise has become smaller or disappeared, oil sludge
could make the lash adjusters stick. Clean the lash
adjusters. (Refer to the Engine Workshop Manual.) If not
improved, go to step 5.
5. Bleed air from the lash adjusters. (Refer to P.11A-14, LASH
ADJUSTER AIR BLEEDING.)
6. If the noise has not disappeared even after the air bleeding,
clean the lash adjusters. (Refer to the Engine Workshop
Manual.)
On-vehicle Service
with the lash adjusters is generated after the engine
is started, and will vary according to the engine speed.
However, this noise is not related to the actual engine
load.
Because of this, if the noise does not occur immediately
after the engine is started, if it does not change in
accordance with the engine speed, or if it changes
in accordance with the engine load, the source of
the noise is not the lash adjusters.
will almost never disappear, even if the engine has
been run at idle to let it warm up.
The only case where the noise might disappear is
if the oil in the engine has not been looked after properly
and oil sludge has caused the lash adjusters to stick.
→
D).
11A-13