Lost Oil pressure!

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Pepe - 09 Dec 2004 00:08 GMT

Hi,
Today when I took my car for going home there was no
Oil pressure when I started. The pressure was just fine in
the morning. Fine for me is on the middle of the scale.
I think it means 4 bars or that what it reads, when OK.

But this evening the pressure was slowly raising to just
1 bars, just enough to let the lamp go off. I stopped and
checked the oil level with the dipstick and the level was
OK, just 1 or 2 mm below the "normall" marking.
After a second start the oil pressure was still that low but
when i opend the oil filler cap on top of the engine I could
clearly see that the oil is flooding the cam shafts. It seams
that there is pressure and there is no noise from any
bearings or valvetrain. A thing I notised is that it takes
5 seconds for the oil pressure to drop from 1 bars to 0 bars.

Is there a problem with the Oil pressure sender unit?
Has anyone out there had the same problem?

Jaguar XJ 40 -94 4.0 litre 6-cyl. 145000Km on the meter.

Pepe
Jaguar XJ 40 -94 Soverign (Winter car)
Jaguar XJS 6.0 -95 conv (Summer car)

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webserve - 09 Dec 2004 00:30 GMT

Pepe,
Probably everyone with an XJ40 has had the same problem with the oil
sending unit. It is a common problem with these cars. Pick up a new one
and it should cure the problem. Keep in mind that there are two different
types. One that is like the original and sends bars up and down the scale
and the other that is either on or off -- no gradients.

The caveat to all this is that you need to make sure that it is
indeed a sender problem and not a pump problem. Seeing oil on the cams is a
pretty good indication that it is a sender, but I would make haste to
replace it.

Webserve

> Hi,
> Today when I took my car for going home there was no
[quoted text clipped - 21 lines]
> Jaguar XJ 40 -94 Soverign (Winter car)
> Jaguar XJS 6.0 -95 conv (Summer car)

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Pepe - 09 Dec 2004 00:47 GMT

> Pepe,
> Probably everyone with an XJ40 has had the same problem with the oil
[quoted text clipped - 10 lines]
>
> Webserve

Thanks for your reply.
I would like to check the pressure with a manometre.
Do you know what tread there is on the sender unit?
Is it 1/8" or 1/4" to fit to the block?
Only when I can read the pressure on the manometre
I can relay on the sender unit or the gauge. I hope there
will be "good" pressure when I connect the manometre.

Pepe
Jaguar XJ 40 -94 Soverign (Winter car)
Jaguar XJS 6.0 -95 conv (Summer car)

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