Opel 1900 1973, Service Manual

Page: 293 / 625

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
.................................... . .........
General Specifications ......................................................
Engine Dimension and Fits
............................................
Page No.
2
4
6
6
7
8
DESCRIPTION AND OPERATION
ENGINE CONSTRUCTION
Engine Usage
The 1.9 liter engine is standard equipment on all 1973
Opel
Manta and GT models. This engine has
a compression ratio of and operates
“regular” low lead grade fuel.
Engine Construction
The is made of high-grade chromium
grey cast iron. The valve guides are cast with
the head. The overhead camshaft is supported in four
bearings in the cylinder head.
Location of the 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
Alumetizing makes the valve heads
non- scaling and promotes long life. All engines have
The forged, main bearing crankshaft has large-
diameter main and connecting rod bearing journals
with considerable overlap for vibration-free operat-
ion.
bearing shells are used for main and
connecting rod bearings. The crankshaft end play is
controlled by the rear main bearing.