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231 V6 ENGINE V.I. CODE C
6A3-11
3. Clean the screen and housing thoroughly in solvent
and blow dry with air.
Installation
Install by reversing removal procedure,
paying
particular attention to the following points.
1. Make sure oil pump pipe flange gasket surface of block
is smooth and free of dirt.
2. Use new gasket and tighten bolts to specifications. See
Fig. 6A3-21.
Fig.
6A3-21
Oil Pickup Pipe and Screen
3. Install oil pan.
TESTING OIL PRESSURE
If low oil pressure is suspected, the pressure can be
checked on the car with tool set J 25087.
1. Check oil level.
2. Raise vehicle and remove oil filter.
3. Assemble plunger valve in the large hole of the tester
base and the hose in the small hole of the tester base. Connect
guage to the end of the hose.
4. Insert the flat side of the rubber plug, for ease of
installation, in the by-pass valve without depressing the by-
pass valve itself.
5. '~nstall the tester on filter mounting pad.
6. Start engine to check overall pressure, sender switch,
or noisy lifters. Pressure should be as follows:
NOTE: Engine should be at operating temperature
before checking oil pressure.
231 cu. in. V6 37 psi
6 3
2600 rpm.
7. If adequate oil pressure is indicated, check pressure
sending switch.
8. If a low reading is indicated, depress the valve on
tester base to isolate the oil pump and/or its components from
the lubricating system. An adequate reading at this time
would indicate a good pump and the previous low pressure
was due to worn bearings etc. A low reading while depressing
the valve would indicate a faulty pump.
PRIMING THE OIL PUMP WITH TOOL J
25087
1. Assemble plunger valve in the large hole of the tester
base and the hose in the small hole of the tester base. Connect
guage to the end of the hose.
2. Insert the flat side of the rubber plug, for ease of
installation, in the by-pass valve without depressing the by-
pass valve itself.
3. Install the tool on filter mounting pad.
4. Connect a pressurized air supply to the primer
attachment.
5. Depress lever on primer attachment while at the same
time holding valve on tester base down to assure that oil will
be lifted instead of air being drawn from bearings etc. Hold
these positions until a light spray of oil emits from the nozzle
verifying that the oil pump has been primed.
6. Remove primer assembly, install filter and start
engine.
NOTE: In the event of failure to raise oil during priming
operation, check for vented system, such as a cracked or
broken pump body or relief valve in open position. If oil can
be lifted during priming operation, but pump fails to function,
check for worn or broken pump drives. A broken or twisted
pump drive may indicate a lock-up (frozen) oil pump.
7. Inspect and replace as necessary.
OIL PUMP AND RELIEF VALVE
CLEANING
At times an oil pump or oil pump relief valve may be
stuck due to the presence of foreign particles. They may be
cleaned in the following manner:
1. Blow compressed air through the oil channel (between
the pump and filter pad), with short blasts this will further
open the relief valve allowing these particles to be forced from
the pump. If this operation is successful, the oil pump will
once again be able to deliver pressure.
2. Follow procedure for priming oil pump.
NOTE: Failure to prime at this time will necessitate oil
pump overhaul or replacement.
OIL PUMP COVER AND GEARS
REMOVAL, INSPECTION AND
INSTALLATION
Removal
1. Remove oil filter.
2. Remove screws attaching oil pump cover assembly to
timing chain cover. Remove cover assembly and slide out oil
pump gears.
3. Wash off gears and inspect for wear, scoring, etc.
Replace any gears not found serviceable.
4. Remove the oil pressure relief valve cap, spring and
valve. See Fig. 6A3-22. Oil filter by-pass valve and spring are
staked in place and should not be removed.
5. Wash the parts thoroughly and inspect the relief valve
for wear or scoring. Check the relief valve spring to see that
it is not worn on its side or collapsed. Replace any relief valve
spring that is questionable.
6. Check the relief valve in its bore in the cover. The
valve should have no more clearance than an easy slip fit. If
any perceptible side shake can be felt the valve and/or cover
should be replaced.
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