DSG-423 GENERAL INFORMATION
01-16
11.Instruct the customer to run engine as usual and
perform the following:
• Check the oil level regularly at intervals of
3 to 3-1/2 hours.
• Return to the service point when the oil level
drops below the lower (ADD) mark on the oil level
dipstick.
• Add only full quarts of the same oil in an emer-
gency. Note the mileage at which the oil is added.
12.Check the oil level under the same conditions and at
the same location as in Steps 7-9.
• Measure the distance from the oil level to the UP-
PER mark on the oil level dipstick and record.
• Measure the distance between the two scribe
marks and record.
• Divide the first measurement by the second.
• Divide the hours run during the oil test by the re-
sult. This quantity is the approximate oil con-
sumption rate in hours per quart.
13.If the oil consumption rate is unacceptable, proceed
to next step.
14.Check the positive crankcase ventilation (PCV)
system. Make sure the system is not plugged.
15.Check for plugged oil drain-back holes in the
cylinder heads and cylinder blocks.
16.If the condition still exists after performing the above
steps, proceed to next step.
17.Perform a cylinder compression test -- Refer
to“Compression Tests” on page 12 or perform a
cylinder leak detection test with Engine Cylinder
Leak Detection/Air Pressurization Kit -- Refer
to“Cylinder Leakage Detection” on page 13. This
can help determine the source of oil consumption
such as valves, piston rings or other areas.
NOTE: After determining if worn parts should be
replaced, make sure correct replacement parts are
used.
18.Check valve guides for excessive guide clearances.
REPLACE all valve stem seals after verifying valve
guide clearance.
19.Worn or damaged internal engine components can
cause excessive oil consumption. Small deposits of
oil on the tips of spark plugs can be a clue to internal
oil consumption. If internal oil consumption still
persists, proceed as follows:
• Remove the engine from the vehicle and place it
on an engine work stand. Remove the intake
manifolds, cylinder heads, oil pan and oil pump.
• Check piston ring clearance, ring gap and ring
orientation. Repair as required.
• Check for excessive bearing clearance. Repair
as required.
20.Perform the oil consumption test to confirm the oil
consumption concern has been resolved.
Oil Pressure Test
1. Disconnect and remove the oil pressure sensor from
the engine.
2. Connect the Engine Oil Pressure Gauge and
Transmission Test Adapter to the oil pressure
sender oil gallery port.
3. Run the engine until normal operating temperature is
reached.
4. Run the engine at 3000 rpm and record the gauge
reading.
5. The oil pressure should be within specifications.
6. If the pressure is not within specification, check the
following possible sources:
• insufficient oil
• oil leakage
• worn or damaged oil pump
• oil pump screen cover and tube
• excessive main bearing clearance
• excessive connecting rod bearing clearance
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