[Mk2] [Turbo] No oil pressure after full rebuild help!

[mazzerdod]

Hope you can help!

I've finished a full rebuild on an ST205 engine the motor went back in today I removed the plugs and primed the oil filter and spun her over to get the oil light out before actually starting the engine.

However the oil light would not go out... so I removed the pressure switch spun her over and no oil is coming out?

I removed the spring and piston from the oil pressure relief valve spun her over and nothing coming from here either?

I think I may have done something wrong when assemblying the oil pump I can remember aligning two dots on the oil pump gears and pumping as much oil in there as I could before fitting the outer casing have I missed something?

Any advise would be great!

[3S Service Centre]

if you primed the pump its most likely a bad seal on the pickup assembly, a slighty leaking gasket/seals = no vacume and no pickup.

The sump will need to come off.

James

[mazzerdod]

Ok that may be possible after I assembled the engine side casing/oil pump and fitted the two part sump assembly I noticed I had forgot to put the bung I removed from the oil way in the block the one behind the side casing/oil pump assembly

So I removed the side casing without taking off the two part sump by removing the studs that the oil pickup is fastened to... anyway it was a bit fiddly to put back on with the two part sump still in place and I wonder if one of the two 'O' rings may have not aligned correctly could this cause my problem?

Also I did not fit a new oil pick up gasket the steel compresable one I figured it was new anyway and hadn't seen any heat cycles so left it could this also cause an issue?

Lastly is there no way I could have assembled the oil pump incorrectly I know it all went back together but do i need to align it or something?

[3S Service Centre]

I see exactly what your saying fella. Now im convinced you need to remove the sump

If that gasket hasnt sealed or the rubber seal has slipped slighty you will not get oil pressure.

James

[mazzerdod]

Thanks for the advise chap it will be done tomorrow afternoon and if we have to..... over night parts from Japan lol!

Oh by the way its my friends GT4 not an Mr2 had a look and seems possible without dropping the motor fingers crossed!!

Thanks again!

Mario

[3S Service Centre]

Ok thats cool, unfortunately you will need to drop the exhaust and subframe as a minimum.
good luck.

[mazzerdod]

Oh one last thing honest lol!

As we think the problem lies between the oil pickup gasket and/or the two 'O' rings all of which can be replaced via the sump removal..... am I right in assuming there is no need to remove the side casing/oil pump?

This will save me loads of hastle as I will not have to mess about with the cambelt etc!

[3S Service Centre]

yes no need to remove the oil pump housing.

[mazzerdod]

Your the man

[3S Service Centre]

Yeah I know

[mazzerdod]

Ok I've removed the sump today and submerged the oil pickup in oil turned the car over and oil flys out of the feed that goes from the oil pump to the oil filter.

I did the same again but tried to stop the oil from coming out of the feed that goes to the oil filter and couldn't.... got covered in oil!

This has some what confused me as to what to do next any suggestions?

[3S Service Centre]

I think I know what your trying to say

Are you saying the gasket and seals were good so you tried stalling a sytem that makes upto 6bar of oil pressure with your finger

Beats brylcream dont it

James

[mazzerdod]

Ummmm yes lol!

However I did not give her the finger I used my thumb lol!

With the sump off I am unable to stop the oil discharging from the oil filter outlet so why didn't I have any oil up top coming from the oil pressure sensor yesterday?

If the oil is being picked up by the pump and the pump is pushing it into the oil filter what could prevent it moving further?

Maybe there was an airlock or something yestersay possible?

Or maybe there isn't enough oil pressure I might try to hook something up to take a reading, any idea what the pump pressure would likely be when I'm just winding her over on the key? With no plugs in of coure!

[3S Service Centre]

You thumbed her???

what head gasket you running?? is the engine turning over quick enough?? did you put your oil squirters back in??

James

[^Trickster^]

Turning over by the key is a waste of time in my opinion, the amount of time it takes by the key to fill the filter then circulate it then engine is running dry.

Start the engine and it will get to pressure in no time, ive never known anyone get the oil pressure light off by turn over only.

Take the pressure switch out and start it with a bucket ready, that proves your getting oil to the head, if nothing gets there by 5 seconds you have probably fitted the headgasket the wrong way and blocked the oil port.

Graeme

[mazzerdod]

I'm running a standard head gasket the gasket would only fit on one way from memory and was located on the dowls with the arrow pointing towards the cambelt.

The oil squirters have been installed.

The oil filter was primed before assembly i.e. I filled it left it 5 mins filled it again until it would take no more oil.

I'm just puzzled as to what to try next? Starting the motor before I have oil circulation just concerns me a bit I've been trying to think logically.

So the oil is being picked up from the sump, the pump is pumping the oil as far as the oil filter but we don't know at what pressure?

Is there something that would stop the oil travelling any further i.e. a duff oil filter, could the pressure relief valve thingy jamb and stop oil circulation?

S.O.S GT4 down lol!

[cantfindausername]

I agree with graeme. Its a worrying thing to start the engine when you're not convinced oil is getting round, but you've got it to the main galley as you can get it out the filter fitting, so this will be lubing the crank from here. Start the engine, and you will get oil out the pressure sensor hole in the head.

[mazzerdod]

I've tried to attach a sketch of how I understand the route the oil takes and have been thinking about the pressure release valve.

Earlier in the post I think I mentioned I removed this including the plunger and no oil was present when turning the car over.

Well I didn't actually remove the plunger!

Does the pressure release valve act as a non return valve thus the oil pressure pushes the plunger out of the way to enable oil to pass into the main gallery?

If this pluger is jambed could that prevent oil from passing into the main oil gallery?

[3S Service Centre]

We get oil pressure by turning the engine over no trouble but you need a strong bettery.

Starting the car is ok if your sure you dont have a blockage but it could end in serious triuble if you have.

James

[mazzerdod]

Yea when ever I do oil changes I wizz the motor over before starting to get the oil light out.

And bearing in mind I have the plugs out of this car so she turns over pretty quick.

I know it's a little different because the engine has been completely drained of oil but I would have expected the light to go out or at least have had some oil coming from the pressure sensor.

Do you think a sticking pressure release valve/non return valve could prevent oil travelling into the main oil gallery as my sketch suggests?

I'm getting desperate the only alternative is assemble the sump again fill with oil and have another go but I can't face having to remove it all if its the same lol!

And I defo don't want to remove the oil pump if it could be something else!