Opel Frontera UBS. Manual - part 251

6A–71

ENGINE MECHANICAL

NOTE: Do not apply engine oil to the crank case side
bolts.

Main bearing cap bolts.
Torque: 39 N·m (4.0 Kg·m/29 lb ft)

Oil gallery fixing bolts.
Torque:
1st step: 29 N·m (3.0 Kg·m/21 lb ft)
2nd step 55

°

∼

 65

°

Crank case side bolts
Torque : 39 N·m (4.0 Kg·m/29 lb ft)

NOTE: Do not allow the crankshaft to rotate.

015RS006

10. Remove the main bearing caps in the sequence

shown in the illustration.

015RS004

11. Measure the plastigage width and determine the oil

clearance. If the oil clearance exceeds the specified
limit, replace the main bearings as a set and/or
replace the crankshaft.

Standard : 0.019 mm–0.043 mm

(0.0007 in–0.0017 in)

Limit : 0.08 mm (0.0031 in)

015RS008

12. Clean the plastigage from the bearings and the

crankshaft.
Remove the crankshaft and the bearings.

Crankshaft (12) Inspection

Inspect the surface of the crankshaft journal and crank
pins for excessive wear and damage. Inspect the oil seal
fitting surfaces for excessive wear and damage. Inspect
the oil ports for obstructions.

Inspection and Repair

1. Carefully set the crankshaft on the V–blocks. Slowly

rotate the crankshaft and measure the runout. If the
crankshaft runout exceeds the specified limit, the
crankshaft must be replaced.

Runout : 0.04 mm (0.0016 in)

015RS007

6A–72

ENGINE MECHANICAL

2. Measure the diameter and the uneven wear of main

journal and crank pin. If the crankshaft wear exceeds
the specified limit, crankshaft must be replaced.

Main journal diameter : 63.918 mm–63.933 mm

(2.5165 in–2.5170 in)

Crank pin diameter : 53.922 mm–53.937 mm

(2.1229 in.–2.1235 in.)

Uneven wear limit : 0.005 mm (0.0002 in)

015RS009

Crankshaft Bearing Selection

When installing new crankshaft bearings or replacing
bearings, refer to the selection table below. Select and
install the new crankshaft bearings, paying close
attention to the cylinder block journal hole.

1. Diameter size mark (1) and the crankshaft journal.

015RS010

2. Diameter size mark (1).

The diameter size marks are stamped on the No.1
crankshaft balancer as shown in the illustration.

015RS011

NOTE: Take care to ensure the bearings are positioned
correctly.

015RS012

Legend

(1) Number 1 and 4 main bearing upper and lower
(2) Number 2 and 3 main bearing upper
(3) Number 2 and 3 main bearing lower

6A–73

ENGINE MECHANICAL

1 Size

Mark

Main Bearing

Bore Diameter

Crank Shaft Main

Journal Diameter

2 Size

Mark

Crank Shaft

Bearing

Size Mark

(Upper

Side)

Crank Shaft 

Bearing

Size Mark

(Lower

Side)

Oil Clearance

(Reference)

1

68.994-69.000

63.918-63.925

(2.5165-2.5167)

2

Blue

Blue

0.030-0.049

(0.0012-0.0019)

1

(2.7163-2.7165)

63.926-63.933

(2.5168-2.5170)

1

Brown

Brown

0.028-0.047

(0.0011-0.0019)

2

68.987-68.993

63.918-63.925

(2.5165-2.5167)

2

Brown

Brown

0.029-0.048

(0.0011-0.0019)

2

(2.7160-2.7163)

63.926-63.933

(2.5168-2.5170)

1

Green

Green

0.027-0.046

(0.0011-0.0018)

3

68.980-68.986

63.918-63.925

(2.5165-2.5167)

2

Green

Green

0.028-0.047

(0.0011-0.0019)

3

(2.7157-2.7160)

63.926-63.933

(2.5168-2.5170)

1

Yellow

Yellow

0.026-0.045

(0.0010-0.0018)

Reassembly

1. Crankshaft (12)

D

Install the main bearings to the cylinder block and
the main bearing caps.

D

Be sure that they are positioned correctly.

D

Apply new engine oil to the upper and lower main
bearing faces.

NOTE: Do not apply engine oil to the main bearing back
faces.

015RS012

D

Carefully mount the crankshaft.

D

Apply engine oil to the thrust washer.

D

Assemble the thrust washer to the No.3 bearing
journal. The oil grooves must face the crankshaft.

015RS013

2. Rear oil seal (10)

D

Remove the oil from the cylinder block and the
retainer mounting surface.

D

Apply sealant (TB–1207B or equivalent) to the
retainer mounting surface, following the pattern
shown in the illustration.
The retainer must be installed within 5 minutes after
sealant application befor the sealant hardens.

6A–74

ENGINE MECHANICAL

015RW002

Legend

(1) Around Bolt Holes
(2) Around Dowel Pin

D

Apply engine oil to the oil seal lip.

D

Align the cylinder block dowel pin holes with the rear
retainer dowel pins.

D

Tighten the rear retainer fixing bolts. New bolts
should be used when installing rear retainer.

Torque: 18 N·m (1.8 Kg·m/13 lb ft)

NOTE: Be very careful not to disengage the oil seal garter
spring during installation of the rear retainer.

If the seal was removed from retainer for
replacement, apply engine oil to the oil seal lip and
install the oil seal using 5–8840–2286–0 oil seal
installer.

015RW001

015RS017

3. Flywheel (9)

1. Thoroughly clean and remove the oil from the

threads of crankshaft.

2. Remove the oil from the crankshaft and flywheel

mounting faces.

3. Mount the flywheel on the crankshaft and then

install the washer.

4. Hold the crankshaft to prevent from rotating then

install the bolts in the order shown to the specified
torque.

Torque: 54 N·m (5.5 Kg·m/40 lb ft)

NOTE: Do not reuse the bolt and do not apply oil or thread
lock to the bolt.

015RS018