Outer Limits 4x4 Board

mate of mine asked me to post this for him as i couldnt answer it for him.... how can you increase you oil pressure so that you get a strong oil pressure reading on you gauge? i told him to ask a mech. but i also said it has something to do with your oil and its viscosity......... can some one elaborate.

You can change the oil pressure by changing the spring behind the oil relief valve.

Dont know if its advisable to up the oil pressure, would put alot of stress on gaskets and seals and may cause other problems in the motor

Firstly, has it got low oil pressure?

If it does then the relief valve could be sticking open, or the engine could be old and tired.

If its the relief valve you should drop the plunger and spring out and have a look. Replacing the plunger with a new one from toyota (mine was $10 from toyota) can sometimes solve the problem.

If the engine is just old and tired then you could add thicker oil although this really wont help youe engine that much. If its an old engine the oil is just leaking past the bearings etc alot easier and thats why you have low oil pressure. Thicker oil will just stop it leaking past so much, but as long as you have at least about 45 PSI at 2500RPM then you wont be damaging anything.

As a few people have said...check your oil relief valve.

You shouldn't have to increase the oil pressure, usually it's pretty high, and probably enough for what you need.

cheers will pass it on

You can strech the spring a bit but as Barney7779 said about stress on various seals but iv'e heard of them being streched to far and blowing oil filters apart and seen a guy in my tafe group accidently put a press relif valve in backward blew the filter off after it expanded it like a baloon so be careful

have a check wiht your local autopro or repco and u might be able to get in a high pressure one. i have one in my camaro v6 in the lux and it idles at 35psi and revs out at 80psi

just rev the engine higher:P

badger wrote:just rev the engine higher:P

That works to. I like your way of thinking

If the engine is tired and bearing oil clearances are too great, then replacing the pressure relief valve spring with a solid one won't necessarily increase the pressure, as the pump may not have enough flow capability to start with.

2H's are known for the relief valve sticking caused by wear in the alloy housing where they run. We used to have a HJ60 which would expand the pressed mounting face of aftermarket oil filters - but never the (obviously stronger) OE filter!

the only safe way would be to put a shim behind the spring and keep adding shims till u get the pressure u want. U wont find a replacment spring that will give u the pressure u want as it doesnt take much to sent the pressure through the roof.

Where is the oil relife valve on a 1fzfe???

where should the oil pressure guage sit on a 2h? mine sits at 75% at full noise, drops to 30% at idle

hjsixty wrote:where should the oil pressure guage sit on a 2h? mine sits at 75% at full noise, drops to 30% at idle

Yeah mine runs same...

Can you not get a different sized diaphram? I had heard somewhere the 12ht ones were a bit bigger.

Dunc

Just to bring this up again,

I have a TD 4.2 80 series and the pressure gauge sometimes only goes up to the 1/3 mark while driving and at idle is between the bottom and 1/3 mark.

Other days it can be sit at half way then it does what I described above again.

I also notice when towing the oil pressure gauge is always showing as what I described in the first paragraph above.

This morning on the way to work it was fine, half way or just a bit below at cruising, idle was 1/3. On the way home cruising was 1/3 idle was less.

Any ideas?

Thanks

I run 15-40 valvaline oil, it does not sound like there is a lack of oil.

Check your oil pressure first, its only a "Guage", the sender unit may be faulty
What sort of car is it.
80 series petrols run at 3/4 and higher, while the diesels run at 1/2 or lower
But both engines have good oil pressure

Thanks,

It is diesel, and the guage never goes above half. I will get the pressure checked and if it is ok look at the sender or guage as being the fault.

it common for a sender to be a bit on the piss also how many K's are on it

just passed 420

Pump could be getting a bit worn and releif valve losing a bit of it's tension but still get it checked may be up for a pump if it's getting worse and worse if not cross your fingers and hope it don't pack it in on a trip

As rule of thumb for performance engine soil pressure should max around 60 psi at 6000 rpm and add 10 psi for every 1000 rpm above that up to a maximum of 80 psi, this is due to the additional windage as oil exits the side of the bearings at high speeds, the pressure ensures the bearings remain floating, there will be some variation from this depending on the origional manufacturers specs. Generally beyond 80 psi causes an excessive loss of horsepower due to trying to drive the oil pump at those pressures at high speed, this puts excessive load on pumps and pump drive shafts and drive gears.

Joel

nice reply pgs, hey i just scored a nice vintage guage by stewart warner,
now it has no sender could i get a std aftermarket swich for this or does it have to be sync'd to the guage by manufacturer?oil p. that is.mechanical line