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Jeep Liberty KJ. Manual - part 891

Crankshaft Marking

JOURNAL SIZE

SIZE mm (in.)

Size

63.488 - 63.496 mm
(2.4995 - 2.4998 in.)

Size

63.496 - 63.500 mm (2.4998 - 2.4999 in.)

Size

63.500 - 63.504 mm (2.4999 - 2.501 in.)

Size

63.504 - 63.512 mm (2.5001 - 2.5004 in.)

Bearing size

Bearing Code

Size

Application

Upper Bearing

.2.443 - 2.447 mm

Use with crankshaft size

(.0961 - .0963 in.)

2.439 - 2.443 mm

Use with crankshaft

S, T

(0.960 - .0961 in.)

2.435 - 2.439 mm

Use with crankshaft

(.0958 - .0960 in.)

Lower Bearing Main

and

2.441 - 2.447 mm

Use with crankshaft

R, S

(.0961 -.0963 in.)

2.435 - 2.441 mm

Use with crankshaft

T, U

(.0958 - .0962 in.)

Lower Main Bearing

and

2.429 - 2.435 mm

Use with crankshaft

R, S

(.0956 - .0958 in.)

2.423 - 2.429 mm

Use with crankshaft

T, U

(.0953 - .0956 in.)

Bearing Clearances

Main

1, 4

Crankshaft

.004 - .034 mm ( .00015 - .0013 in.)

Crankshaft

.004 - .030 mm ( .00015 - .0011 in.)

Crankshaft

.006 - .032 mm (.0002 - .0012 in.)

Crankshaft

.002 - .032 mm (.00007 -. 0012 in.)

Main

2, 3

Crankshaft

.016 - .046 mm (.0006 - .0018 in.)

Crankshaft

.016 - .042 mm (.00062 - .016 in.)

Crankshaft

.018 - .044 mm (.0007 - .0017 in.)

Crankshaft

.014 - .044 mm (.0005 - .0017 in.)

1. Service main bearings are available in four grades. The chart identifies the four service grades available.

9 - 1522

ENGINE - 3.7L

SEAL-CRANKSHAFT OIL-FRONT

REMOVAL

1. Disconnect negative cable from battery.

2. Remove accessory drive belt (Refer to 7 - COOL-

ING/ACCESSORY

DRIVE/DRIVE

BELTS

REMOVAL).

3. Remove A/C compressor mounting fasteners and

set aside.

4. Drain cooling system (Refer to 7 - COOLING -

STANDARD PROCEDURE).

5. Remove upper radiator hose.

6. Disconnect electrical connector for fan mounted

inside radiator shroud.

7. Remove radiator shroud attaching fasteners.

8. Remove radiator cooling fan and shroud (Refer to

COOLING/ENGINE/RADIATOR

FAN

REMOVAL).

9. Remove crankshaft damper bolt.

10. Remove damper using Special Tools 8513 Insert

and 1026 Three Jaw Puller (2).

11. Using Special Tool 8511, remove crankshaft front

seal (1) .

ENGINE - 3.7L

9 - 1523

INSTALLATION

CAUTION: To prevent severe damage to the Crank-
shaft, Damper or Special Tool 8512, thoroughly
clean the damper bore and the crankshaft nose
before installing Damper.

1. Using Special Tool 8348 (2) and 8512 (3), install

crankshaft front seal.

2. Install vibration damper (Refer to 9 - ENGINE/EN-

GINE BLOCK/VIBRATION DAMPER - INSTALLA-
TION).

3. Install radiator cooling fan and shroud (Refer to 7 -

COOLING/ENGINE/RADIATOR FAN - INSTALLA-
TION).

4. Install upper radiator hose.

5. Install A/C compressor and tighten fasteners to 54

N·m (40 ft. lbs.).

6. Install accessory drive belt refer (Refer to 7 -

COOLING/ACCESSORY DRIVE/DRIVE BELTS -
INSTALLATION).

7. Refill cooling system (Refer to 7 - COOLING -

STANDARD PROCEDURE).

8. Connect negative cable to battery.

9 - 1524

ENGINE - 3.7L

SEAL-CRANKSHAFT OIL-REAR

DIAGNOSIS AND TESTING - REAR SEAL AREA LEAKS

Since it is sometimes difficult to determine the source of an oil leak in the rear seal area of the engine, a more
involved inspection is necessary. The following steps should be followed to help pinpoint the source of the leak.

If the leakage occurs at the crankshaft rear oil seal area:

1. Disconnect the battery.

2. Raise the vehicle.

3. Remove torque converter or clutch housing cover and inspect rear of block for evidence of oil. Use a black light

to check for the oil leak:

a. Circular spray pattern generally indicates seal leakage or crankshaft damage.

b. Where leakage tends to run straight down, possible causes are a porous block, oil galley pipe plugs, oil filter

runoff, and main bearing cap to cylinder block mating surfaces. See Engine, for proper repair procedures of
these items.

4. If no leaks are detected, pressurized the crankcase as outlined in the section, Inspection (Engine oil Leaks in

general)

CAUTION: Do not exceed 20.6 kPa (3 psi).

5. If the leak is not detected, very slowly turn the crankshaft and watch for leakage. If a leak is detected between

the crankshaft and seal while slowly turning the crankshaft, it is possible the crankshaft seal surface is damaged.
The seal area on the crankshaft could have minor nicks or scratches that can be polished out with emery cloth.

CAUTION: Use extreme caution when crankshaft polishing is necessary to remove minor nicks or
scratches. The crankshaft seal flange is specially machined to complement the function of the rear oil seal.

6. For bubbles that remain steady with shaft rotation, no further inspection can be done until disassembled. (Refer

to 9 - ENGINE - DIAGNOSIS AND TESTING), under the Oil Leak row, for components inspections on possible
causes and corrections.

7. After the oil leak root cause and appropriate corrective action have been identified, (Refer to 9 - ENGINE/EN-

GINE BLOCK/CRANKSHAFT OIL SEAL - REAR - REMOVAL).

REMOVAL

NOTE: This procedure can be performed in vehi-
cle.

1. If being performed in vehicle, remove the transmis-

sion.

2. Remove the flexplate (Refer to 9 - ENGINE/EN-

GINE BLOCK/FLEX PLATE - REMOVAL).

NOTE: The crankshaft oil seal CAN NOT be reused
after removal.

NOTE: The crankshaft rear oil seal remover Spe-
cial Tool 8506 must be installed deeply into the
seal. Continue to tighten the removal tool into the
seal until the tool can not be turned farther. Fail-
ure to install tool correctly the first time will cause
tool to pull free of seal without removing seal from
engine.

3. Using Special Tool 8506 (2), remove the crankshaft rear oil seal (1)

ENGINE - 3.7L

9 - 1525

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