Question about 2000 Toyota Land Cruiser

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Have little oil pressure on 1981 landcruiser after doing oil change have checked pressure relief valve its ok, have checked crank bearing its ok what next

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Could have wrong oil filter after doing oil change recheck or reolace oil filter

Posted on Feb 04, 2010


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What does a oil pressure relief valve do

For any engine with an oil pump, the components inside it are designed and engineered to operate at a certain range of oil pressures.
For example, an automobile engine might be designed to operate at # 30 to # 70 pounds of pressure.
If you subjected the bearings to double the pressure, you could achieve bearing failure, as you could with not enough pressure.
The oil pressure relief valve will "open" when the upper limit of pressure is reached and allow the extra pressure and oil to go straight back to the crankcase.

Jul 10, 2017 | Cars & Trucks

2 Answers

08 gmc 5.3L vortec 193K daughter drove it tues night, wed morn cranked it, NO oil press. sounds bad! oil pump O-ring, pressure relief, crank bearing? always changed oil @ 5000 miles or less

Has it any oil in it at all?

If the oil level was low heavy cornering and braking can cause oil swill away from the pump pick up robbing the engine of oil pressure for a few moments. At high engine revs it takes only a few seconds for permanent damage to be done.

Some vehicles use a steel oil pan that is quite exposed and if grounded the oil pan can be bent upwards and close off the oil pump inlet.

It isn't unknown for an oil pressure relief valve to stick open but that is unlikely remove all oil pressure from a healthy engine when cold.

Clearly there are some careful checks needed but if the engine sounds bad the damage was probably done Tuesday night so a crankshaft and bearing overhaul is probably needed...

Mar 17, 2017 | GMC Cars & Trucks

2 Answers

Engine oil lamp some times blinks comes on and later when restart it does not come I have Kia Sorento 2009

The oil light will come on when ever pressure is low it ct can be as little as the oil pressure sensor is going out or you may have a blockage somewhere in the oil system try doing an oil change with mobile1 oil this may help if there is a small blockage but defiantly get the sensor checked first

Jan 24, 2015 | 2009 Kia Sorento 3.3

3 Answers

Low oil pressure reading

check that the oil level is not over the mark as this causes foaming of the oil and loss of pressure. At 80km/hr you will be doing around 3 grand and that will be enough to whip the excess oil into froth.. Too much oil is worse than too little oil.

Apr 05, 2014 | 1988 Toyota Land Cruiser

1 Answer

Oil pressure down

This could be worn bottom end bearings, a worn oil pump, a weakened oil pressure relief spring, or a faulty gauge. I once saw a Landcruiser with a faulty gauge.

Get another good gauge into the oil pressure port as a first step. If it gives the same low reading try a temporary fill of thicker engine oil. If this causes the reading to rise, it is probably worn bottom end bearings, not unusual in a 95 model.

After that you will need to inspect the oil pump.

Apr 12, 2013 | 1995 Toyota Land Cruiser

1 Answer

Engine oil light blanking of and on when driving

It could be
-low oil level-faulty oil pressure sender unit
-stuck over pressure relief valve in the oil pump-worn engine bearings
The first step is to check the oil level, and if OK, have a mechanic take out the oil pressure sender and substitute an oil pressure gauge. Ask for a look at the reading as the engine is run then.

These gauges are cheap enough if you wish to do this yourself, and you can then install it on the dash somewhere.

Often if the engine bearings are that worn, the car will blow blue smoke and consume oil.

In the meantime keep the revs down as much as possible.

Feb 22, 2013 | 1996 Toyota Camry

1 Answer


After the obvious, checking the oil level, the next step is to remove the oil pressure sensor and connect an oil pressure gauge. It sounds like you have already done this, so on to other things.

Try changing the oil filter in case it has a weak overpressure valve (meant to pass oil if the filter becomes blocked).

Some Camrys of this era suffered engine sludging, and if this has occurred it may have partly blocked the oil pickup in the sump.

After that suspect a faulty overpressure relief valve in the oil pump, or even a worn pump (this is rare in a 2007).

Worn big end and crank bearings will cause low oil pressure, but if that has occurred you would normally notice the engine burning oil (blue smoke). This and the oil pickup can be checked by dropping the sump, best done on a hoist.

Nov 05, 2012 | 2007 Toyota Camry

1 Answer

Looking for oil pressure relief valve on my 95 cabrio

The oil pressure relief valve should be on the oil pump.If your oil pressure is ok,have the wiring tested to theswitches or try another set of clocks

Sep 01, 2009 | 1997 Volkswagen Eurovan

2 Answers

I have a 96 isuzu rodeo with a 3.2 and an automatic trany... i just put in a new oil pump in it cause of it was seeming to not have enough pressure to get enough oil to the upper end of the motor... i am...

there should be an oil sending unit somewhere near the oil filter and if it is the sending unit this would have been alot cheaper then changing the oil pump

Jan 03, 2009 | 1996 Isuzu Trooper

1 Answer

High oil pressure and knocking in the engine

There is a pressure relief valve in the oil pump, it is stuck closed, this happens now and then, seen it 2 times, since the oil pump is a positive displacement pump it can produce 100's of pounds of pressure, the reason for the noise is that u have allot OF pressure but very little volume, the bearings are being starved for lubrication, replace the oil pump, DO NOT DRIVE THE TRUCK, U WILL BURN OUT THE ROD AND CRANK BEARINGS.

Dec 10, 2008 | 1999 GMC Sierra

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