Opel Frontera UBS. Manual - part 1270

ENGINE MECHANICAL 6A – 13

3.

Valve Spring

•

Attach the valve seat to the upper spring seat.  The
painted area of the valve spring should be facing
downward.

2.

Split Collar

•

Use a spring compressor to push the valve spirng
into position.

•

Install the spring seat split collar.

•

Set the split collar by tapping lightly around the
head of the colar with a rubber hammer.

Valve spring compressor: 9-8523-1423-0 (J-29760)

1.

Rocker Arm Assembly

N·m(Kg·m/lb·ft)

54 (5.5/40)

6A – 14 ENGINE MECHANICAL

CAMSHAFT, TAPPET

6.

Camshaft Timing Gear

•

Install the stopper bolt 1 to the timing pulley to
prevent it from turning.

•

Use the timing pulley puller 2 to remove the
pulley.

Camshaft Timing Pulley Puller: 5-8840-0086-0

7.

Camshaft Thrust Plate

DISASSEMBLY

1.

Cylinder Head Assembly

2.

Flywheel

3.

Cylinder Block rear Plate

4.

Crankcase Assembly

5.

Oil Pump Assembly

ENGINE MECHANICAL 6A – 15

INSPECTION AND REPAIR

Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered
during inspection.

8.

Camshaft

9.

Tappet

1.

Measure the Camshaft Thrust Clearance.

•

Use a dial indicator to measure the camshaft end
play.
This must be done before removing the camshaft
gear.
If the camshaft end play exceeds the specified
limit, the thrust plate must be replaced.

2.

Camshaft Journal Diameter

•

Use a micrometer to measure each camshaft
journal diameter in two directions (1 and 2).  If the
measured value is less than the specified limit,
the camshaft must be replaced.

3.

Cam Height

•

Measure the cam height  

H

   with a micrometer.  If

the measured value is less than the specified
limit, the camshaft must be replaced.

Standard

Limit

mm(in)

49.945-49.975 (1.9663-1.9675)

49.60 (1.9528)

Journal Diameter

Standard

Limit

mm(in)

42.02 (1.6543)

41.65 (1.6398)

Cam Height

Standard

Limit

mm(in)

0.08 (0.0031)

0.2 (0.0079)

Camshaft End Play

6A – 16 ENGINE MECHANICAL

4.

Camshaft Run-Out

•

Mount the camshaft on V-blocks.

•

Measure the run-out with a dial indicator.
If the measured value exceeds the specified limit,
the camshaft must be replaced.

5.

Camshaft and Camshaft Bearing Clearance

•

Use an inside dial indicator to measure the
camshaft bearing inside diameter.

Standard

Limit

mm(in)

0.02 (0.0008) or less

0.10 (0.0039)

Run-Out

•

If the clearance between the camshaft bearing
inside diameter and the journal exceeds the
specified limit, the camshaft bearing must be
replaced.

Camshaft Bearing Replacement

Camshaft Bearing Removal

1.

Remove the cylinder body plug plate.

2.

Use the bearing replacer to remove the camshaft
bearing.
Bearing Replacer:  5-8840-2038-0

Camshaft Bearing Installation

1.

Align the bearing oil holes with the cylinder body oil
holes.

2.

Use the replacer to install the camshaft bearing.
Bearing Replacer: 5-8840-2038-0

Standard

Limit

mm(in)

50.00 – 50.03

(1.9685 – 1.9697)

50.08 (1.9716)

Camshaft Bearing Inside Diameter

Standard

Limit

mm(in)

0.025 – 0.085

(0.0010 – 0.0033)

0.12 (0.0047)

Camshaft Bearing Clearance