Thread: Oil pressure problems

I had a Series III hybrid on Range Rover running gear several years ago, it had the twin SU 3.5 V8 and had exactly the same problem with low oil pressure at low revs when hot.

I confirmed with an oil pressure guage and the problem was real, I think it was just engine wear and would have taken a lot of work to fix. I did think about a new high flow oil pump but I eventually fixed it with oil additives (thickeners) and managed it with good quality synthetic oils plus additives at each change.

How old is your oil pump? Did you check it out when you had the motor apart?

Steve

Try a new oil pressure sender and see if that is the problem, first, Regards Frank.

Had the same issue with mine a while back... I added the Lucas Heavy Duty Oil Stabilizer and that stopped the Light coming on...

I've since then replaced the Oil Pump/Timing Chain Set with New Oil etc...

Thanks all.

Frank that's a good idea, i've got a new one I put on the 93 which i'll swap over, infact you've jogged my memory in regards to that exact problem I had on the 93.

The pump gears are brand new, but the pump cover and timng cover do have minor scoring marks on them.

If it isn't the pressure switch (re-used the old one), i'll put a guage on there and see what the go is, just have to find one with UNF (UNO) thread and not BSP...

Another thought is the oring on the oil pick up tube - I thought the oring looked okay - though my three year old was using it as a bugle...

Originally Posted by benji

Thanks all.

The pump gears are brand new, but the pump cover and timng cover do have minor scoring marks on them.

I felt like i was stating the obvious, but thought it worth asking. I hope the sender is the culprit and not the bugle

Steve

first things first, have you recently changed the oil weight you are running on or to a synthetic oil. you need to put a master gauge on it to make sure of what its doing. if it is normal with the gauge try replacing the switch, if it is dropping pressure try rubbing gouge marks back then check the clearances with feeler gauges, the my case also had scoring on it when i did the engine up so i very carefully rubbed it back with some wet and dry and it works fine.
lastly and the most scary option, is your security system acting like normal,no hiccups driving etc, as part of the initial start up the ecu sends a signal to the BeCM to turn the oil lamp on when you first turn the key on, this is part of the security deactivation sequence on p38's. if your problem is in this direction id start looking at your insurance paperwork and head for a deep water crossing in a gazetted road

good luck and hope its the sender.

Lol, deep water in Bendigo?

Im using gtx 15w40 which should be fine- its what ive run before.
Started it yesterday after replacing a lifter and oil pressure switch and its still doing the same thing - but only when its cold. After a few minutes of running it behaves.

Ive found a uno - bsp fitting so ill putting the guage on soon.

Would anyone know what pressure I should be getting at idle, and what pressure the light comes on at, and also how far the strainer is supposed to be off the bottom of the sump?