Mitsubishi Space Star. Manual — part 8
ENGINE <4G1> – On-vehicle Service
11B-5
10. Check that the ignition timing is at the standard ignition
timing.
Standard value: Approx. 10
BTDC
NOTE
(1) There should be no problems if the ignition timing
varies within a range of about 7
.
(2) At high altitudes, advance the ignition timing by about
a further 5
from the standard value.
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
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.
(2) If there is a problem with the lash adjusters, the noise
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.
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.)
ENGINE <4G1> – On-vehicle Service
11B-6
3.
While the engine is idling, check that the noise level does
not change when the engine load is varied.
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.
6.
If the noise has not disappeared even after the air bleeding,
clean the lash adjusters. (Refer to the Engine Workshop
Manual.)
<LASH ADJUSTER AIR BLEEDING>
NOTE
(1) If the vehicle is parked on a slope for a long period
of time, the amount of oil inside the lash adjuster will
decrease, and air may get into the high pressure
chamber when starting the engine.
(2) After parking the vehicle for long periods, the oil drains
out of the oil passage, and it takes time for the oil
to be supplied to the lash adjuster, so air can get
into the high pressure chamber.
(3) If either of the above situations occur, the abnormal
noise can be eliminated by bleeding the air from inside
the lash adjusters.
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.
Good
ENGINE <4G1> – On-vehicle Service
11B-7
(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.
High-
pressure
chamber
Gradually open the
throttle valve.
Drive pattern for air bleeding
Close the throttle
valve.
Approx.
3,000 r/min
15
seconds
15
seconds
Idle speed
Once
ENGINE <4G1> – Camshaft and Camshaft Oil Seal
11B-8
CAMSHAFT AND CAMSHAFT OIL SEAL
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation
Air Cleaner Removal and Installation
Ignition Coil Removal and Installation
(Refer to GROUP16.)
9 . 8 – 1 2 N m
1
2
4
5
6
7
8
9
11
14
1 2 – 1 5 N m
5 . 0 N m
2 8 – 3 4 N m
8 8 N m
10
2 2 N m
3 . 5 N m
15
16
Apply engine oil to all
sliding parts during
installation.
Sealant:
MITSUBISHI GENUINE PART
MD970389 or equivalent
14
3
9 . 8 – 1 2 N m
9 . 8 N m
12
13
5 . 0 N m
Removal steps
1. Breather hose
2. PCV hose
3. Accelerator cable clamp
4. Rocker cover
5. Rocker cover gasket
6. Spark plug guide
7. Timing belt front upper cover
A
B
8. Camshaft sprocket
A
9. Camshaft oil seal
10. Rocker arm and shaft assembly
11. Camshaft position sensor connector
12. Ignition failure sensor connector
13. Ignition failure sensor
14. Camshaft position sensor support
15. Camshaft
16. Camshaft position sensing cylinder
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