Ford Falcon. Manual - part 111
303-01a-15
Engine — I6
303-01a-15
DIAGNOSIS AND TESTING (Continued)
1.0 litres used for 10mm distance below the
Oil consumption Test
FULL mark for the 4.0L I6 engines. For
The following diagnostic procedure is used to
engines employing the alternate method of
determine the source of excessive oil consumption.
marking the dipstick with levels corresponding
NOTE: Oil use is normally greater during the first
to a volume difference of 1 litre, note the
15,000 km of service. As mileage increases, oil use
distance the new oil level is below the Top
decreases. High speed driving, towing, high ambient
scribed mark and divide this by the distance
temperature and other factors may result in greater oil
between the original two scribed marks. This
use.
gives the volume of oil in litres used during
the test.
1. Define excessive consumption such as the
7. Divide the distance travelled (kilometres)
number of kilometers driven per litre of oil used.
during the test by the amount of oil used
Also determine customer’s driving habits, such as
(litres) to produce the oil consumption in
sustained high speed operation, towing, extended
kilometres per litre.
idle and other considerations.
8. If the oil consumption is unacceptable go to
2. Verify that the engine has no external oil leaks as
Step 9.
described in the Engine Oil Leaks section.
6. Check the positive crankcase ventilation (PCV)
3. Verify that the engine has the correct oil level.
system. Make sure the system is not plugged.
4. Verify that the engine is not being run in an
7. Check for plugged oil drain-back holes in the
overfilled condition. Check the oil level at least
cylinder head and cylinder block.
five minutes after a hot shutdown with the vehicle
parked on a level surface.
8. If the condition still exists after carrying out the
above tests go to Step 9.
5. Carry out an Oil Consumption Test:
9. Carry out a cylinder compression test as outlined
1. For a 4.0L I6 engine, drain the engine oil and
in the Compression Test section. This can help
refill the engine. Run for 10 minutes, and
determine the source of oil consumption such as
allow the engine to stand for 5 minutes to
valves, piston rings or other areas.
allow the oil to drain to the crankcase.
10. Check valve guides for excessive guide
2. Top up the oil level exactly to the full mark.
clearance. Install new valve stem seals if
Allow to stand for 5 minutes and re-check.
required.
NOTE: For engines other than the 4.0L I6,
11. Worn or damaged internal engine components
refill the engine with one litre less oil than
can cause excessive oil consumption. Small
specified.
deposits of oil on the tips of the spark plugs can
Run the engine for 10 minutes and allow to
be a clue to internal oil consumption.
stand for 5 minutes. Clean the dipstick and
scribe a line on the back face of the dipstick
Intake Manifold Vacuum Test
blade corresponding with this level, then
Bring the engine to normal operating temperature.
reinsert.
Connect a vacuum gauge or equivalent to the intake
Add exactly 1 litre of oil to the engine. Run for
manifold. Run the engine at the specified idle speed.
5 minutes and allow to stand for 5 minutes.
Mark the new level on the back of the
The vacuum gauge should read between 51-74 kPa
dipstick. This should correspond closely to the depending upon the engine condition and the altitude
FULL mark.
at which the test is carried out. Subtract 4.0 kPa from
the specified reading for every 300m of elevation
3. Record the vehicle’s odometer reading.
above sea level.
4. Instruct the customer to drive the vehicle as
The reading should be steady. Adjust the gauge
usual and:
damper control (where used) if the needle is fluttering
Check the oil level regularly at intervals of
rapidly. Adjust damper until needle moves easily
250 km.
Return to the service point when the oil
without excessive flutter.
level drops below the ADD mark on the oil
dipstick.
Add only full litres of the same oil in an
emergency. Note the mileage at which the
oil is added.
5. Check the oil level under the same conditions
and at the same location as in steps 1-3.
6. Measure the distance from the full mark to the
current oil level on the oil dipstick and
calculate the oil usage based on a volume of
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