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Mitsubishi Montero (2002-2004). Manual - part 826

ON VEHICLE SERVICE

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ENGINE MECHANICAL

11A-9

6. Set compression gauge to one of the spark plug holes.
7. Crank the engine with the throttle valve fully open and

measure the compression pressure.

Standard value (at engine speed of 250

− 400 r/min):

1,177 kPa (171 psi)
Minimum limit (at engine speed of 250

− 400 r/min):

875 kPa (127 psi)

8. Measure the compression pressure for all the cylinders, and

check that the pressure differences of the cylinders are
below the limit.

Limit: 98 kPa (14 psi)

9. If there is a cylinder with compression or a compression

difference that is outside the limit, pour a small amount of
engine oil through the spark plug hole, and repeat the
operations in steps 6 to 8.

(1) If the compression increases after oil is added, the cause

of the malfunction is a worn or damaged piston ring and/
or cylinder inner surface.

(2) If the compression does not rise after oil is added, the

cause is a burnt or defective valve seat, or pressure is
leaking from the gasket.

10.Connect the crankshaft position sensor connector.
11.Install the spark plugs and spark plug cables.
12.Use the scan tool to erase the diagnostic trouble codes.

NOTE: This will erase the diagnostic trouble code resulting
from the crankshaft position sensor connector being discon-
nected.

MANIFOLD VACUUM CHECK

M1111002700310

1. Start the engine and allow it to warm up until the

temperature of the engine coolant reaches 80

− 95°C (176 −

203

°F).

2. Connect a tachometer.
3. Attach a Tee-fitting union to the vacuum hose between the

fuel pressure regulator and the intake manifold plenum, and
connect a vacuum gauge.

4. Start the engine and check that idle speed is within

specification. Then check the vacuum gauge reading.

Idle speed: 700

± 100 r/min

Minimum limit: 60 kPa (18 in Hg)

AKX00436

COMPRESSION
GAUGE

AK200796

VACUUM GAUGE

AK200796AB

ON VEHICLE SERVICE

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ENGINE MECHANICAL

11A-10

LASH ADJUSTER CHECK

M1111002900024

If an abnormal noise (chattering noise) suspected to be caused
by malfunction of the lash adjuster is produced immediately
after starting the engine and does not disappear, perform the
following check.
NOTE: An abnormal noise due to malfunction of the lash
adjuster is produced immediately after starting the engine and
changes with the engine speed, irrespective of the engine load.
If, the abnormal noise is not produced immediately after start-
ing the engine or does not change with the engine speed, or it
changes with the engine load, the lash adjuster is not the cause
for the abnormal noise.
NOTE: When the lash adjuster is malfunctioning, the abnormal
noise is rarely eliminated by continuing the warming-up of the
engine at idle speed.
However, the abnormal noise may disappear only when seizure
is caused by oil sludge in the engine whose oil is not main-
tained properly.
1. Start the engine.
2. Check if the abnormal noise produced immediately after

starting the engine, changes with the change in the engine
speed.
If the abnormal noise is not produced immediately after
starting the engine or it does not change with the engine
speed, the lash adjuster is not the cause for the noise.
Therefore, investigate other causes. The abnormal noise is
probably caused by some other parts than the engine proper
if it does not change with the engine speed. (In this case, the
lash adjuster is in good condition.)

3. With the engine idling, change the engine load (shift from N

to D range, for example) to make sure that there is no
change in the level of abnormal noise.
If there is a change in the level of abnormal noise, suspect a
tapping noise due to worn crankshaft bearing or connecting
rod bearing (In this case, the lash adjuster is in good
condition.).

4. After completion of warm-up, run the engine at idle to check

for abnormal noise.
If the noise is reduced or disappears, clean the lash adjuster
(Refer to GROUP 11B, Rocker Arms and Camshaft

−

Inspection

P.11B-24

). As it is suspected that the noise is

due to seizure of the lash adjuster. If there is no change in
the level of the abnormal noise, proceed to step 5.

5. Run the engine to bleed the lash adjuster system (Refer to

P.11A-10

.).

6. If the abnormal noise does not disappear after air bleeding

operation, clean the lash adjuster (Refer to GROUP 11B,
Rocker Arms and Camshaft

− Inspection

P.11B-24

ON VEHICLE SERVICE

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ENGINE MECHANICAL

11A-11

Bleeding lash adjuster system
NOTE: Parking the vehicle on a grade for a long time may
decrease oil in the lash adjuster, causing air to enter the high
pressure chamber when starting the engine.
NOTE: After parking for many hours, oil may run out from the
oil passage and take time before oil is supplied to the lash
adjuster, causing air to enter the high pressure chamber.
NOTE: In the above cases, abnormal noise can be eliminated
by bleeding the lash adjuster system.
1. Check engine oil and add or change oil if required.

NOTE: If the engine oil level is low, air is sucked from the oil
screen, causing air to enter the oil passage.
NOTE: If the engine oil level is higher than specification, oil
may be stirred by the crankshaft, causing oil to be mixed
with a large quantity of air.
NOTE: If oil is deteriorated, air is not easily separated from
oil, increasing the quantity of air contained in oil.

NOTE: If air mixed with oil enters the high pressure chamber
inside the lash adjuster from the above causes, air in the
high pressure chamber is compressed excessively while the
valve is opened, resulting in an abnormal noise when the
valve closes. This is the same phenomenon as that
observed when the valve clearance has become excessive.
The lash adjuster can resume normal function when air
entered the lash adjuster is removed.

2. Idle the engine for one to three minutes to warm it up.

3. Repeat the operation pattern, shown in left figure, at no load

to check for abnormal noise. (Usually the abnormal noise is
eliminated after repetition of the operation 10 to 30 times. If,
however, no change is observed in the level of abnormal
noise after repeating the operation more than 30 times,
suspect that the abnormal noise is due to some other
factors.)

4. After elimination of abnormal noise, repeat the operation

shown in left figure five more times.

5. Run the engine at idle for one to three minutes to make sure

that the abnormal noise has been eliminated.

AKX00328

GOOD

MINIMUM

MAXIMUM

AKX00329

HIGH-
PRESSURE
CHAMBER

AKX00330

OPEN THROTTLE
VALVE GRADUALLY

CLOSE
THROTTLE VALVE

APPROXI-
MATELY
3,000 r/min

IDLING
OPERATION

ONCE

15 s

AIR BLEEDING OPERATION PATTERN

ENGINE ASSEMBLY

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ENGINE MECHANICAL

11A-12

ENGINE ASSEMBLY

REMOVAL AND INSTALLATION

M1112001000593

CAUTION

*: Indicates parts which should be initially tightened, and then fully tightened after placing the vehicle
horizontal and loading the full weight of the engine on the vehicle body.

Pre-removal Operation
• Skid Plate and Under Cover Removal

• Engine Oil Draining (Refer to GROUP 12, On-vehicle Ser-

vice

− Engine Oil Replacement

P.12-3

• Engine Coolant Draining (Refer to GROUP 14, On-vehicle

Service

− Engine Coolant Replacement

P.14-5

• Fuel Line Pressure Reduction [Refer to GROUP 13A,

On-vehicle Service

− Fuel Pump Relay Disconnection