LOW OIL PRESSURE. 2006 GRANSPORT. I THINK ENGINE NEEDS TO COME OUT.

azapa · Nov 6, 2018

Sticky pressure relief valve? I imagine oil filter has been changed, some have built in relief too for when very clogged. Good luck!

Oxytorch · Nov 6, 2018

Gp79 said:
If there is no engine noise when showing zero oil pressure you would have to think just a faulty reading?

If the pressure was really zero it would be game over pretty quickly.

That's true. I agree the pressure gauge must be somewhat inaccurate when reading zero because the oil pressure tester showed 18 psi, which should give a readout of 1.25 bar on the dash gauge. Maybe the senders aren't designed to measure much below that value, so it just drops to zero. Just speculation though. Both pressure senders I have tried (original one and new replacements) show the same thing. The old sender is flaky though. The needle bobs about intermittently.

Oxytorch · Nov 6, 2018

azapa said:
Sticky pressure relief valve? I imagine oil filter has been changed, some have built in relief too for when very clogged. Good luck!

I don't think the lubrication system on these cars has a pressure relief valve. It's built into the dry sump oil filter I believe. Oil filter was replaced with recent oil change.

Andy Marshall · Nov 6, 2018

Oxytorch said:
I don't think the lubrication system on these cars has a pressure relief valve. It's built into the dry sump oil filter I believe. Oil filter was replaced with recent oil change.

Did you have the symptoms before the oil and filter change? (apologies if you have already posted this information) If not, then faulty filter?
Just re-read your first post and you've had issues for a while. It still sounds like something stuck/blocked to me. You don't go from having oil pressure to not having oil pressure and then back again if the pump is knackered

Gp79 · Nov 6, 2018

Andy Marshall said:
Did you have the symptoms before the oil and filter change? (apologies if you have already posted this information) If not, then faulty filter?
Just re-read your first post and you've had issues for a while. It still sounds like something stuck/blocked to me. You don't go from having oil pressure to not having oil pressure and then back again if the pump is knackered

Good point.

Ensure correct filter 188814 has been supplied and fitted, for dry sump engines.

Filter 289571 is for the wet sumps in the QP but it looks the same and I'm sure could easily be fitted by mistake.

dgmx5 · Nov 6, 2018

philw696 said:
When I bought mine the independent that had looked after it in Kent condemned the engine.

@philw696, was the independent Prestige? I take it you resurrected the condemned engine.

CatmanV2 · Nov 6, 2018

Oxytorch said:
That's true. I agree the pressure gauge must be somewhat inaccurate when reading zero because the oil pressure tester showed 18 psi, which should give a readout of 1.25 bar on the dash gauge. Maybe the senders aren't designed to measure much below that value, so it just drops to zero.

Definitely not the case on my old one. It would read pretty well at the low end. Certainly didn't drop to zero.

C

philw696 · Nov 6, 2018

dgmx5 said:
@philw696, was the independent Prestige? I take it you resurrected the condemned engine.

It was the Kent Ferrari center and yes she was in Good health once the pump assembly was renewed.

Oxytorch · Nov 30, 2018

Just a little update on the low oil pressure reading on the dash gauge. I had the oil filter cut open. There were no metal flecks or fragments visible. However, the oil had only seen about 500 km since the oil change.
Of possible significance, I've discovered a clue that might point to it being due to some sort of electrical glitch. I noticed the oil pressure reading changes if I turn the fan on or off. Having aircon on or set to eco (off) doesn’t make a difference. For example, If I’m travelling in 4th gear at 60 kph, oil pressure gauge shows about 2.5 bar with the fan off but if I turn it on to full, pressure drops all the way to zero and vice versa. I noticed this when coolant temp was only 60 C but happens at 90 C too. I think this might also be happening when the radiator fan kicks in but I can’t be sure.
What do you think?

CatmanV2 · Nov 30, 2018

.....post 15....

C

mjheathcote · Nov 30, 2018

If it was my 70's Stag, it would be the voltage regulator for the gauges. Don't know if modern cars with electric analogue gauges still use a voltage regulator?

conaero · Nov 30, 2018

Worth having a look at the body Ecu/Bridge Can unit above the accelerator pedal. It converts digital signals to work with analogue gauges....how could that possibly go wrong?

Zep · Dec 2, 2018

The meter is measuring the resistance of the sender, the oil pressure moves a wiper across a variable resistance board. The sender earths through the engine block and so the gauge is measuring the resistance between the earth and the contact on the gauge.

Possible causes if you are seeing variation with electrical load is the engine earth strap, wire to the gauge, or a bad earth from the gauge to the body (if this is shared with the heater fan then this sounds likely).

If the gauge ticks (jumps from one reading to another) then the wiper in the sender is sticking and needs replacing.

allandwf · Dec 2, 2018

Zep said:
The meter is measuring the resistance of the sender, the oil pressure moves a wiper across a variable resistance board. The sender earths through the engine block and so the gauge is measuring the resistance between the earth and the contact on the gauge.

Possible causes if you are seeing variation with electrical load is the engine earth strap, wire to the gauge, or a bad earth from the gauge to the body (if this is shared with the heater fan then this sounds likely).

If the gauge ticks (jumps from one reading to another) then the wiper in the sender is sticking and needs replacing.

A VERY cheap and cheerful design, it's almost as if they designed in failure! As if

Zep · Dec 2, 2018

allandwf said:
A VERY cheap and cheerful design, it's almost as if they designed in failure! As if

Pretty grim eh?

azapa · Dec 3, 2018

To be fair the above design pressure sender is/was standard across the industry and found in millions of cars.

alfatwo · Dec 3, 2018

The specialist trade use what they call wet gauges for these sorts a diagnosis
An highly accurate analogue oil pressure gauge connected by a flexi hose that screws directly into the engine's high pressure oil take off.

If the pressures low your in for trouble

if the readings normal, it could be one of many electrical faults causing the problem

Dave

Zep · Dec 4, 2018

azapa said:
To be fair the above design pressure sender is/was standard across the industry and found in millions of cars.

A good point, it’s not a Maser specific, but given the tech Allan works with it’s a bit 1950s.

philw696 · Dec 4, 2018

As Dave has pointed out you can't beat hard evidence over trickery.

Avvrobin · May 23, 2021

buongiorno, perdonami il problema, purtroppo ho il tuo problema, come l'hai risolto, grazie
[QUOTE = "Gp79, post: 659386, membro: 4294"]
Se non c'è rumore del motore quando si mostra la pressione dell'olio zero dovresti pensare solo a una lettura difettosa?

Se la pressione fosse davvero zero, il gioco sarebbe finito abbastanza rapidamente.
[/CITAZIONE]
buongiorno, perdonami il problema, purtroppo ho il tuo problema, come l'hai risolto, grazie

LOW OIL PRESSURE. 2006 GRANSPORT. I THINK ENGINE NEEDS TO COME OUT.

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