6
1973 OPEL SERVICE MANUAL
DIAGNOSIS
EXCESSIVE OIL CONSUMPTION
C o n d i t i o n
C o r r e c t i o n
External Oil Leaks at:
Tighten attaching bolts. If leaks
Rocker Arm Covers
persist, remove cover (or pan),
Crankcase Front Cover
check sealing surfaces for burrs
Oil Pan and Gasket
or scoring, replace gasket, and
seal bolts with
sealer or
equivalent. Make sure oil level
not overfull.
Improper Reading of
Car may not be level when taking
Stick
oil “drain-back” time
after stopping engine (three
minutes must be allowed). Dip-
stick may not be completely pushed
down against stop. Dipstick may
be bent.
Oil Viscosity Too Light
Use recommended SAE viscosity for
prevailing temperatures.
Continuous High-Speed
At speeds above 60 mph, increased
Driving
sumption can be expected with any
Inform customer of this fact.
High-Speed Driving
When principal use of automobile i
Following Normal Slow
city driving, crankcase dilution f
Speed City Driving
condensation occurs. High speed a
temperatures will remove water,
resulting in what appears to be
rapid lowering of oil level.
Inform customer of this fact.
Piston Rings Not
Allow engine to accumulate at leas
“Broken In”
miles before attempting any
engine disassembly to correct for
oil consumption.
NOISY VALVES AND LIFTERS
If the preceding check indicates valve mechanism is
abnormally noisy, remove the rocker arm cover so
that the various conditions that cause noise may be
The noise level of the valve mechanism cannot be
checked. A piece of heater hose of convenient length
properly judged where the engine is below operating
may be used to pick out the particular valves or valve
temperature when the hood is raised, or when the
linkages
are causing abnormal noise. With the
valve rocker arm covers are removed.
engine running
a speed where the noise is pro-
nounced; hold the
of hose to an ear and hold
Before attempting to judge valve noise level, the en-
other end about
inch from point of contact
gine must be thoroughly warmed up (at least 20
rocker arm and valve stem. Mark or record the
minutes of operation at
to 1500 RPM) to
noisy valves for investigation of following causes:
oil and coolant temperatures and bring all engine
parts to a normal state of expansion. When the
1.
Sticking,
Eccentric Valves,
gine is warmed up, listen for engine noise while
Guides
Sticking valves will cause irregular engine
ting in the driver’s seat with the hood closed. Run the
operation or missing on a low speed pull and will
engine at idle and at various higher speeds.
usually cause intermittent noise.
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