6A. 6 1973 OPEL SERVICE MANUAL
DIAGNOSIS
EXCESSIVE OIL CONSUMPTION
Condition Correction
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 silastic sealer or
equivalent. Make sure oil level
,is
not overfull.
Improper Reading of Dip- Car may not be level when taking r
Stick InsuffIcient 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”
4,OCO
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
thit
are causing abnormal noise. With the
valve rocker arm covers are removed. engine running at a speed where the noise is pro-
nounced; hold the end of hose to an ear and hold
Before attempting to judge valve noise level, the en- other end about
l/2
inch from point of contact be-
gine must be thoroughly warmed up (at least 20 tween rocker arm and valve stem. Mark or record the
minutes of operation at
1200
to 1500 RPM) to stabil- noisy valves for investigation of following causes:
ize oil and coolant temperatures and bring all engine
parts to a normal state of expansion. When the
en-
1. Sticking,
Warped,
or Eccentric Valves,
Worn
gine is warmed up, listen for engine noise while
sit-
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.
