oil pressure

[Cathelijne]

While accelerating the oil pressure drops to zero sometimes. But later on it climbs up till 42 psi.At the same speed the pressure is constant.
Any ideas?



>>> Edited by Cathelijne on Saturday 16th November 15:07

[GreenV8S]

While accelerating the oil pressure drops to zero sometimes. But later on it climbs up till 42 lb.At the same speed the pressure is constant.
Any ideas?

>>> Edited by Cathelijne on Saturday 16th November 15:05

Sounds very much like oil surge, have you checked the oil level recently?

Cheers,
Peter Humphries (and a green V8S)

[Cathelijne]

The oil level is checked and ok.

[GreenV8S]

Cathelijne said: The oil level is checked and ok.

Hopefully the pressure is OK, and it's just the sensor then. Does the gauge move when you wiggle the wires at the engine end? (You would need to have the engine running, so be very carefull.)

Cheers,
Peter Humphries (and a gen V8S)

[Cathelijne]

GreenV8S said:

Cathelijne said: The oil level is checked and ok.

Hopefully the pressure is OK, and it's just the sensor then. Does the gauge move when you wiggle the wires at the engine end? (You would need to have the engine running, so be very carefull.)

Cheers,
Peter Humphries (and a gen V8S)

I'm not able to check it at the moment because it's to dark outside, but I have another question: Is it possible it has the wrong dipstick? The number is 71TM6750CA and it's a Ford.

[GreenV8S]

Cathelijne said:

GreenV8S said:

Cathelijne said: The oil level is checked and ok.

Hopefully the pressure is OK, and it's just the sensor then. Does the gauge move when you wiggle the wires at the engine end? (You would need to have the engine running, so be very carefull.)

Cheers,
Peter Humphries (and a gen V8S)

I'm not able to check it at the moment because it's to dark outside, but I have another question: Is it possible it has the wrong dipstick? The number is 71TM6750CA and it's a Ford.

Quite possible. I assume it *is* a Ford engine in yours? If you have a standard sump, you could make absolutely sure by draining the oil and filling from scratch, making allowance for oil coolers and so on. I don't know what the oil capacity should be but no doubt somebody does. In the mean time you might try just sticking an extra litre in and seeing whether the problem improves slightly. In which case, that does suggest the oil level is actually too low regardless of what the dipstick says!

Cheers,
Peter Humphries (and a green V8S)

[shpub]

Could be a broken pick up pipe in the sump so that uphill the pipe comes out of the oil and on the level it goes back in and restores the pressure.

Need to drain the oil and drop the sump.

[erik280i]

The number on my '85 280i dipstick is the same as yours and measures max with 4.5 ltr oil.
The oilpressure gauge is connected by a tube to the engine so there is no electrical connection.
Shpub's suggestion could be the right one.

[kjr]

A friend of mine, with a Ferrari 355, had a similar problem. Excuse any typo's and spelling mistakes as Top Gear starts in a couple of minutes.

He runs his own garage and has owned and serviced a number of Ferraris and Porches. He was experiencing a drop in oil pressure under acceleration which he traced to a duff oil line. All the oil lines on the Ferrari are "Aeroquip": internal rubber hose sheathed in a metal outer sheath.

The rubber internal hose in one oil line had been damaged. Under acceleration the oil pump was try pump more oil, instead the suction of the oil pump was deforming the damaged rubber hose which was constricting therefore blocking the flow of oil through the oil line.

Hope this makes sense and is of some use.

KJR.

[Cathelijne]

The beast is roaring again, the only fault was a loose sender (Thank heaven for that)
Thank you all very much for your advises. I do appreciate it.


>> Edited by Cathelijne on Sunday 24th November 12:34