Opel Frontera UBS. Manual - part 395

SECTION 6A2

4JG2-NA/4JG2-TURBO ENGINE

CONTENTS

PAGE

General Description ..................................................................................................................... 6A2- 1

Engine Mount (RH) .................................................................................................................. 6A2- 3
Engine Mount (LH) .................................................................................................................. 6A2- 4
Intercooler (4JG2-T only) ........................................................................................................ 6A2- 5
Cylinder Head Cover ............................................................................................................... 6A2- 6
Inlet Manifold ........................................................................................................................... 6A2- 8
Exhaust Manifold .................................................................................................................... 6A2-10
Turbo Charger (4JG2-T only) .................................................................................................. 6A2-11
Timing Gear ............................................................................................................................. 6A2-15
Valve Stem Oil Seal and Valve Spring .................................................................................. 6A2-21
Rocker Arm Shaft Assembly .................................................................................................. 6A2-24
Cylinder Head .......................................................................................................................... 6A2-26
Crankcase ................................................................................................................................. 6A2-31
Oil Cooler.................................................................................................................................. 6A2-34
Oil Pump Assembly ................................................................................................................. 6A2-36
Piston, Piston Ring and Connecting Rod .............................................................................. 6A2-37
Crankshaft and Main Bearing ................................................................................................. 6A2-39
Front Oil Seal ........................................................................................................................... 6A2-45
Rear Oil Seal ............................................................................................................................ 6A2-46
Engine Assembly ..................................................................................................................... 6A2-48

GENERAL DESCRIPTION

SECTION

6A2 – 2 4JG2-NA/4JG2-TURBO ENGINE

RECARD Comet V Type swirl combustion chamber which
provides superior driving performance, fuel economy and
silent combustion over a wide range of driving
conditions, is applied.

The cylinder head gasket is of laminated steel sheets.

Three grades of the gasket according to the measured
piston head projection from the cylinder block are
provided to give the engine a minimum compression
ration fluctuation.

The cylinder head fixing blots, flywheel bolts and con-
necting rod fixing bolts are tightened by the angular
Tightening Method.

The chrome plated steel dry type (Chromard) cylinder
liners provide the highest durability.

Auto-thermatic pistons having steel struts with 0.7 mm
offset from the piston pin center line, ate applied to
reduce thermal expansion and resulting engine noise
when the engine is cold.

The crankshaft bearings and connecting rod bearings are
of aluminum having a high bearing surface.

These bearing are especially sensitive to foreign material
such as metal scraps. So, it is very important that the oil
ports and other related surfaces are kept clean and free of
foreign material.

Crank shaft bearing selection for optimum bearing and
journal clearance is applied to reduce vibration and noise.

As tufftriding (Nitrizing treatment) is applied to increase
crankshaft strength, crankpins and journals should not be
reground.

An oiling jet device for piston cooling is provided in the
lubricating oil circuit from cylinder block oil gallery via a
check valve.

Take care not to damage any oiling jet when removing
and installing piston and connecting assembly.

The DFI (Double Formation Injection) Pintaux Type
injection nozzle having a sub-injection hole is applied.
This nozzle contributes to substantially minimize the
diesel knocking sound noticeable in the cold engine idling
operation.
Install the injection nozzle, directing the sub-injection hole
to the specified direction.
QOS III preheating system which features a quick-on glow
plug with thermometer control of the glowing time and
the afterglow time function, is applied.

4JG2-NA/4JG2-TURBO ENGINE 6A2 – 3

ENGINE MOUNT (RH)

REMOVAL

Preparation:

•

Battery ground cable

•

Support engine

•

Support vehicle

Front Tire

Dust Cover

Engine Mount

•

Remove fixing be its from cylinder body and
chassis frame.

INSTALLATION

Engine Mount

40 (4.1/30)

N·m(kg·m/lb·ft)

Cylinder body side

40 (4.1/30)

N·m(kg·m/lb·ft)

Chassis frame side

•

Tighten the fixing bolts to the specified torque

Dust Cover

Front Tire

118 (12.0/87)

N·m(kg·m/lb·ft)

6A2 – 4 4JG2-NA/4JG2-TURBO ENGINE

118 (12.0/87)

N·m(kg·m/lb·ft)

ENGINE MOUNT (LH)

REMOVAL

Preparation:

•

Disconnect battery ground cable

•

Support engine

•

Support vehicle

Front Tire

Dust Cover

Engine Mount

•

Remove fixing bolts from cylinder body and
chassis frame.

INSTALLATION

Engine Mount

•

Tighten the fixing bolts to the specified torque

Dust Cover

Front Tire

•

Tighten the fire fixing nuts to specified torque

40 (4.1/30)

N·m(kg·m/lb·ft)

Cylinder body side

40 (4.1/30)

N·m(kg·m/lb·ft)

Chassis frame side

41 (4.2/30)

N·m(kg·m/lb·ft)

Chassis frame side

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