How can i fix the oil pump
see this tips and fix it. God bless you
The oil pump supplies oil to
lubricate your engine. If the oil pump is worn or is not turning, the
engine will suffer a loss of oil pressure, which may result in engine
damage or engine failure.
The first sign of trouble may be a low oil pressure warning
light, a drop in the normal reading on you oil pressure gauge (if your
car has one), or the appearance of ticking or clattering sounds from
As a rule, most engines only need about 10 PSI of oil pressure
for every 1,000 RPM of engine speed. Oil pressure will read higher than
normal when a cold engine is first started because the oil is thick.
Oil pressure will gradually drop as the engine warms up and the oil
thins out. So normal oil pressure on a warm engine cruising down the
highway is typically 30 PSI up to 45 PSI.
SYMPTOMS OF OIL PUMP TROUBLE
The first thing you should do if any of these symptoms occur
is to stop your car, turn off the engine, let it sit for a few minutes,
then check the oil level on the dipstick. If the oil level is at or
below the ADD line, add a quart of oil to bring the level back up to the
full mark. Add as much oil as is needed to raise the level to the full
mark. Then restart the engine. If the warning light remains on, or
the oil pressure reading does not climb back up to its normal range, or
the engine noise does not go away, you may have a bad oil pump.
The other possibilities include a bad oil pressure sending unit,
or a problem with the oil pressure warning light circuit or oil pressure
OIL PRESSURE SENDING UNIT
If the engine is NOT making any unusual noises and seems to be
running normally, and the oil level on the dipstick is FULL, but you are
still getting a low oil pressure warning light or low gauge reading,
the fault could be a bad oil pressure sending unit.
The oil pressure sending unit is mounted on the engine block. On
some applications, there is a spring-loaded pressure-sensitive
diaphragm with a switch inside the sending unit. This switch completes
the circuit to the low oil pressure warning light if oil pressure drops
below a certain threshold. The unit may stop working if the diaphragm
inside fails, if the switch is stuck, if the small hole that allows oil
to enter the sending unit becomes plugged, if there is a loose, corroded
or broken wiring connector at the sending unit, or there is a fault in
the wiring circuit between the sending unit and warming light.
On vehicles that have an oil pressure gauge (electronic, not
mechanical), the oil pressure sending unit has a small rheostat inside
that sends a variable voltage signal to the oil pressure gauge when the
diaphragm moves. A worn spot on the rheostat or any of the other
problems just described for the simple pressure-type oil pressure
switches can cause a problem.
FORD'S FAKE OIL PRESSURE GAUGE
On many Ford vehicles that were built from 1980 through the
1990s, the oil pressure sending unit has two switches, a low pressure
and a high pressure. These vehicles also have an oil pressure gauge,
but the reading on the gauge is not a true indication of real oil
pressure. As long as the pressure to the sending unit is between high
and low, the gauge will read normal. If oil pressure drops and trips
the low pressure switch, the dash gauge will now read low. Or, if oil
pressure goes up and trips the high switch inside the sending unit, the
dash gauge will read high. Consequently, don't rely on the oil pressure
gauge for an accurate reading in these vehicles. It is only a gross
indication if the oil pressure is low, normal or high.
OIL GAUGE PROBLEMS
If the engine is NOT making any unusual noises and seems to
be running normally, the oil level on the dipstick is FULL, and you have
replaced the oil pressure sending unit but are still getting a low oil
pressure reading on the dash gauge, the fault could be in the wiring
circuit between the sending unit and gauge, or the gauge itself might be
Check the wiring connections on both ends as well as wiring
continuity between the sending unit and gauge. If no wiring faults are
found, hook up a pressure gauge directly to the oil pressure port on the
engine and check oil pressure with the engine running. If the
engine-mounted gauge shows normal oil pressure but the dash gauge is
reading low, the problem is a bad dash gauge.
On the other hand, if the engine-mounted pressure gauge reads low
and you have done all of the above, chances are the oil pump is worn,
or it is not picking up enough oil because of a restriction or blockage
in the pickup screen in the bottom of the crankcase.
OIL PUMP PICKUP PROBLEMS
The pickup tube has a screen on the end to prevent large
chunks of anything bad that ends up in the crankcase from being sucked
into the pump. But we are talking BIG chunks of debris, not normal wear
particles or carbon or dust or other microscopic-sized abrasive
particles that can cause pump wear over time.
Sep 28, 2012 |
1996 Toyota Tercel