6A- 2 1973 OPEL SERVICE MANUAL
ENGINE
CONTENTS
Subject
DESCRIPTION AND OPERATION:
Engine Construction ..........................................................
Lubrication System
............................................................
DIAGNOSIS:
Excessive Oil Consumption
............................................
Noisy
Valves
and
Lifters
..................................................
MAINTENANCE AND ADJUSTMENTS:
Valve
Lifter Adjustment
..................................................
MAJOR REPAIR:
Engine Removal and Installation
..................................
Engine
Oil Pan Removal
and
Installation ..................
Manifold, Cylinder Head, Valve Train and
Lifters
................................................................................
Connecting Rod Bearings
................................................
Crankshaft Bearings and Seals
....................................
Piston, Rings and Connecting Rods
............................
Timing Chain Cover and Timing Chain ......................
Camshaft
..............................................................................
Oil Pump Cover and Gears
............................................
SPECIFICATIONS:
Bolt
Torque .Specifications
....................................
.
.........
General Specifications
......................................................
Engine Dimension and Fits
............................................
Page No.
6A-
2
6A-
4
6A-
6
6A-
6
6A-
7
6A-
8
6A-10
6A-12
6A-15
6A-16
6A-19
6A-23
6A-25
6A-26
6A-27
6A-28
6A-29
DESCRIPTION AND OPERATION
ENGINE CONSTRUCTION
Engine Usage
The 1.9 liter engine is standard equipment on all 1973
Opel
1900,
Manta and GT models. This engine has
a compression ratio of
7.6:1
and operates
on
“regular” low lead grade fuel.
Engine Construction
The
cyfinderhead
is made of high-grade chromium
grey cast iron. The valve guides are cast intergal with
the head. The overhead camshaft is supported in four
bearings in the cylinder head.
Location of the
vzllve
seats in combustion chamber
is above the center of cylinder bore. The spark plug
is positioned in the center and near the highest point
of combustion chamber. This arrangement provides
for short flame travel, uniform combustion and good
cold start prop&ties.
Exhaust valves have seat in-
serts of highly heat and water resisting material. The
head surface is alumetized and so are the seats of the
inlet
v&es
Alumetizing makes the valve heads
non- scaling and promotes long life. All engines have
“rota-caps”.
The forged, five main bearing crankshaft has large-
diameter main and connecting rod bearing journals
with considerable overlap for vibration-free operat-
ion. T&metal bearing shells are used for main and
connecting rod bearings. The crankshaft end play is
controlled by the rear main bearing.
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