Opel Frontera UBS. Manual - part 386

 

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Opel Frontera UBS. Manual - part 386

 

 

ENGINE MECHANICAL 6A – 17

REASSEMBLY

9.

Tappet

1)

Apply a coat of engine oil to the tappet  and the
cylinder body tappet insert holes.

2)

Locate the position mark applied at disassembly (if
the tappet is to be reused).

NOTE:

The tappet must be installed before the camshaft.

TAPPET

Visually inspect the tappet camshaft contact surfaces for
pitting, cracking, and other abnormal conditions.  The
tappet must be replaced if any of these conditions are
present.
Refer to the illustration at the left.
1

Normal contact

2

Cracking

3

Pitting

4

Irregular contact

5

Irregular contact

NOTE:

The tappet surfaces are spherical.  Do not attempt to
grind them with an oil stone or similar tool in an effort to
repair the tappet.  If the tappet is damaged, it must be
replaced.

Tappet Outside Diameter

1.

Measure the tappet outside diameter with a microme-
ter.  If the measured value is less than the specified
limit, the tappet must be replaced.

2.

Measure the inside diameter tappet on the cylinder
block and calculate the clearance.
If the clearance exceeds the limit, replace tappet or/
and cylinder block.

Standard

Limit

mm(in)

12.97 – 12.99

(0.5106 – 0.5114)

12.95 (0.5098)

Tappet Outside Diameter

Standard

Limit

mm(in)

0.03 (0.0012)

0.10 (0.0039)

Clearance Between Tappet and Cylinder Body

6A – 18 ENGINE MECHANICAL

8.

Camshaft

1)

Apply a coat of engine oil to the camshaft and the
camshaft bearings.
Install the camshaft to the cylinder body.
Take care not to damage the camshaft bearings.

7.

Camshaft Thrust Plate

Install the thrust plate to the cylinder body and tighten the
thrust plate bolts to specified torque.

6.

Camshaft Timing Gear

1)

Install the camshaft timing gear to the camshaft.
The timing gear mark ("Y - Y") must be facing out-
ward.

2)

Tighten the timing gear to the specified torque.

5.

Oil Pump Assembly

• Refer to Section 6A2 “Oil Pump Installation”.

4.

Crankcase Assembly

• Refer to Section 6A2 “Crankcase”.

3.

Cylinder Block Rear Plate

Tighten cylinder block rear plate fixing bolts to the
specified torque.

18 (1.8/13)

N·m(Kg·m/lb·ft)

64 (6.5/47)

N·m(Kg·m/lb·ft)

82 (8.4/61)

N·m(kg·m/lb·ft)

2.

Flywheel

• Refer to Section 6A2 “Crankshaft Installation”.

1.

Cylinder Head Assembly

• Refer to Section 6A2 “Cylinder Head Installation”.

ENGINE MECHANICAL 6A – 19

ROCKER ARM ASSEMBLY

DISASSEMBLY

1.

Rocker Arm Shaft Assembly

2.

Rocker Arm Shaft Snap Ring

3.

Rocker Arm

4.

Rocker Arm Shaft Bracket

5.

Rocker Arm

6.

Rocker Arm Shaft Spring

7.

Rocker Arm Shaft

INSPECTION AND REPAIR

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

Use a micrometer to measure the rocker shaft outside
diameter at the point where the rocker arm moves on the
rocker shaft.
Replace the rocker shaft if the diameter exceeds the
specified limit.

Standard

Limit

mm(in)

Rocker Arm Shaft Outside Diameter

18.98 – 19.00

(0.7472 – 0.7480)

18.9 (0.7441)

6A – 20 ENGINE MECHANICAL

Oil Clearance

1.

Use either a vernier caliper or a dial indicator to
measure the rocker arm inside diameter.

2.

Measure the rocker arm shaft outside diameter.
If the measured value exceeds the specified limit,
replace either the rocker arm or the rocker arm shaft.

3.

Check that the rocker arm oil port is free of obstruc-
tions.
If necessary, use compressed air to clean the rocker
arm oil port.

Rocker Arm Correction

Inspection the rocker arm valve stem contact surface for
step wear 1 and scoring 2.
If the contact surfaces have light step wear or scoring,
they may be honed with an oil stone.
If the step wear or scoring is severe, the rocker arm must
be replaced.

Rocker Arm Shaft Run-Out

1.

Place the rocker arm shaft on a V-block.

2.

Use a dial indicator to measure the rocker arm shaft
central portion run-out.
If the run-out is very slight, correct the rocker arm
shaft run-out with a bench press.  The rocker arm
must be at cold condition.
If the measured rocker arm shaft run-out exceeds the
specified limit, the rocker arm shaft must be replaced.

0.3 (0.0118)

mm(in)

Rocker Arm Shaft Run-Out

Limit

Standard

Limit

mm(in)

19.01 – 19.03

(0.7484 – 0.7492)

19.100 (0.7520)

Rocker Arm Inside Diameter

Standard

Limit

mm(in)

0.01 – 0.05

(0.0004 – 0.0019)

0.20 (0.0079)

Clearance Between Rocker Arm and
Rocker Arm Shaft

 

 

 

 

 

 

 

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