Mitsubishi Montero (2004+). Manual — part 446

PROPELLER SHAFT DIAGNOSIS

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PROPELLER SHAFT

25-3

SYMPTOM CHART

M1251002000044

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Noise at Start

DIAGNOSIS

STEP 1. Check if the propeller shaft mounting

bolts and nuts are loose. (Refer to

P.25-5

.)

Q: Are the bolts and nuts tightened to 60

± 10 N⋅m (45

± 7 ft-lb)?

YES :

Go to Step 2.

NO :

Tighten the bolts and nuts to 60

± 10 N⋅m

(45

± 7 ft-lb). Then go to Step 5.

STEP 2. Check the universal joint's journal
bearing of front propeller shaft for wear or

damage. (Refer to

P.25-10

.)

Q: Is wear or damage apparent?

YES :

Replace the journal bearing. Then go to

Step 5.

NO :

Go to Step 3.

STEP 3. Check the BJ assembly's spline of front
propeller shaft for wear.

Q: Is wear apparent?

YES :

Replace the propeller shaft. Then go to Step

5.

NO :

Go to Step 4.

STEP 4. Check the flange sleeve spline of rear
propeller shaft for wear.

Q: Is wear apparent?

YES :

Replace the rear propeller shaft. Then go to

Step 5.

NO :

Go to Step 5.

STEP 5. Retest the system.

Q: Is the abnormal noise eliminated?

YES :

The procedure is complete.

NO :

Recheck from Step 1.

INSPECTION PROCEDURE 2: Noise and Vibration at High Speed

DIAGNOSIS

STEP 1. Check the front propeller shaft run-out.

Q: Is the measured value within the limit: 0.5 mm (0.02

inch)?
YES : Go to Step 2.
NO : Replace the front propeller shaft. Then go to Step 6.

SYMPTOMS

INSPECTION
PROCEDURE

REFERENCE
PAGE

Noise at start

1

P.25-3

Noise and vibration at high speed

2

P.25-3

ACX00643

SPECIAL TOOL

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PROPELLER SHAFT

25-4

STEP 2. Check the front propeller shaft snap rings

thickness. (Refer to

P.25-10

.)

Q: Are they correct?

YES : Go to Step 3.
NO : Replace the snap ring. Then go to Step 6.

STEP 3. Check the front propeller shaft journal bearings

for wear or damage. (Refer to

P.25-10

.)

Q: Is wear or damage apparent?

YES : Replace the journal bearing. Then go to Step 6.
NO : Go to Step 4.

STEP 4. Check the rear propeller shaft for wear or damage.

(Refer to

P.25-9

.)

Q: Is wear or damage apparent?

YES : Replace the rear propeller shaft. Then go to Step 6.
NO : Go to Step 5.

STEP 5. Measure the clearance between the tube and the
shaft at the end portion of the rear propeller shaft tube.

Q: Is the measured value is within the standard value: 0.2

−

0.5 mm (0.008

− 0.020 inch)?

YES : Go to Step 6.
NO : Replace the rear propeller shaft. Then go to Step 6.

STEP 6. Retest the system.
Q: Is the abnormal noise eliminated?

YES : The procedure is complete.
NO : Recheck from Step 1.

SPECIAL TOOL

M1251000600062

ACX00920

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB990840
Universal joint
remover/installer

MB990840-01

Disassembly and
reassembly of universal
joint

MB990840

PROPELLER SHAFT

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PROPELLER SHAFT

25-5

PROPELLER SHAFT

REMOVAL AND INSTALLATION

M1251001000148

WARNING

Since the rear propeller shaft is made of CFRP, it is
important to observe the following warning items
strictly.

•

If a tear, chip or distortion is found on the tube,
replace it with new one.

•

Do not drop, shock, or scratch the tube.

•

If the propeller shaft is scratched on the surface,
inspect whether it is damaged or not using a dye
penetrant. (Refer to

P.25-9

.)

•

If the propeller shaft is dropped on the ground,
replace it with new one. If the dropped rear propel-
ler shaft is reinstalled, the rear propeller shaft may
be broken.

•

When working with the propeller shaft, wrap the
propeller shaft tube with the rubber sheet of 10
mm (0.39 inch) thick and over or with the propeller
shaft protector (part number MR534564) so that it
is not scratched.

•

If a crack or a tear is found on the seal portion at
the end of CFRP tube shown in the illustration,
replace the tube with new one.

•

Dispose of the damaged CFRP propeller shaft in
compliance with Federal, state, and local laws. For
disposing of CFRP products, we do not recom-
mend incineration.

ACX00638 AB

RUBBER SHEET OR
PROPELLER SHAFT PROTECTOR

ACX00639AB

SEAL

SEAL

CFRP TUBE

Pre-removal Operation
Wrap a rubber sheet around the rear CFRP propeller shaft.
<Before removing the rear CFRP propeller shaft>

Post-installation Operation
• Remove the rubber sheet wrapped around the rear CFRP

propeller shaft and visually check whether the shaft is

scratched. <After mounting the rear CFRP propeller
shaft>

• Transfer Gear Oil Supplying <After mounting the front pro-

peller shaft> (Refer to GROUP 23, On-vehicle Service

P.23A-549

.)

PROPELLER SHAFT

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PROPELLER SHAFT

25-6

REMOVAL SERVICE POINTS

.

<<A>> FRONT PROPELLER SHAFT ASSEMBLY REMOVAL
1. Move the transfer shift lever to "2H."
2. Drain transfer gear oil. (Refer to GROUP 23, On-vehicle

Service

P.23A-549

.)

3. Make mating marks on the differential companion flange and

the flange yoke.

CAUTION

Be careful not to bend the joint portion when removing the
propeller shaft, because this will damage the joint boot.
4. Remove the front propeller shaft assembly after placing a

rag around the joint boot portion.

5. Cover the transfer case opening to prevent foreign material

from entering.

.

REMOVAL STEPS

<<A>> >>B<<

1.

FRONT PROPELLER SHAFT
ASSEMBLY

<<B>> >>A<<

2.

REAR PROPELLER SHAFT
ASSEMBLY

ACX00640 AB

GEAR OIL:
HYPOID GEAR OIL API
CLASSIFICATION
GL-4 OR HIGHER/SAE VISCOSITY
80W, 75 - 85W

60

±

10 N

·

m

45

±

7 ft-lb

1

60

±

10 N

·

m

45

±

7 ft-lb

2

ACX00641AB

PROPELLER
SHAFT

JOINT BOOT

RAG

JOINT
ASSEMBLY (BJ)