240 - oil pressure switch?

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David Balfour - 15 Nov 2004 15:17 GMT

Hi all,

Does anybody know the approximate pressure the oil pressure switch activates
in the 240's? (i.e. what does the oil pressure have to be to extinguish the
light?)

I'm sorry this is a rather silly question, but I don't have my technical
manual with me.

Thanks

David

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Dex - 15 Nov 2004 16:57 GMT

It could be around 10PSI it only turns the light off as an indication of
some oil pressure but not full oil pressure.
Basically it just lets you know the pump is working and you have some
oil.
I may be wrong but the above is true for most vehicles.

> Hi all,
>
[quoted text clipped - 8 lines]
>
> David

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David Balfour - 15 Nov 2004 19:03 GMT

> It could be around 10PSI it only turns the light off as an indication
> of some oil pressure but not full oil pressure.
> Basically it just lets you know the pump is working and you have some
> oil.

Hmm, do you think they're generic? The reason I ask is that I'm fitting an
oil pressure gauge to the 240 (for interest really) and there is a selection
of senders for the gauge I have. The differences of the senders are the
pressure at which the switch activates at (it's a three terminal thing -
ground, gauge out (variable) and warning light). I know it's not _that_
important I connect the light if I have a gauge, but it would finish the job
off nicely!

So any advances on 10psi?

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James Sweet - 15 Nov 2004 20:54 GMT

> > It could be around 10PSI it only turns the light off as an indication
> > of some oil pressure but not full oil pressure.
[quoted text clipped - 10 lines]
>
> So any advances on 10psi?

Why don't you just get a sender from a Volvo in a junkyard or order a new
one online? If it's an aftermarket guage then yeah, 10-15 psi should be fine
for the oil light switch, red on the stock guage is below 1bar which is
about 15 psi, I think the light turns on at the same point.

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Dex - 16 Nov 2004 01:48 GMT

According to my 240 manual the engine creates 10PSI per every 1000RPM
therefore at idle the pump would be generating 8-10PSI. If the switch were
set higher the light would not indicate any oil pressure at idle. Since the
light turns off quite quickly, its pressure threshold may be even lower, say
5PSI. I believe oil pressure switch thresholds are generic but the gauges
aren't.

cheers

>> > It could be around 10PSI it only turns the light off as an
>> > indication
[quoted text clipped - 21 lines]
> for the oil light switch, red on the stock guage is below 1bar which is
> about 15 psi, I think the light turns on at the same point.

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