Oil pressure

C

CV35Ian

Member
Took GAA for a Blast last week, oil pressure went down from halfway to zero, left car for a while, restarted it and all ok.

Started car last night again and ran for 10 mins, oil pressure OK.

So, could this be sender related to guage - no warning lights came on? How can I test - I have a multimeter if that helps!

Thanks
 
Hi Ian,

Does GAA have a replacement oil pressure transmitter fitted or is it still the original Smiths unit?

If it is the latter, then the problem is with the sender, old age being the cause. If it is the former, and the unit in appearance has a black plastic cylinder mounted upon a large nut, then that is normal as those senders are extremely unreliable.

Ron.
 
I had a similar problem, when my oil was hot and I'd been on tick over for a while the pressure gauge would plummet but the oil light wouldn't illuminate, a blip on the throttle and all was well for a while then it would repeat. I replaced the gauge sender and all was good. I then cleaned up the old one and pressurised it with a paraffin filled syringe, a thin black line appeared between the translucent plastic section and the steel case, showing a very fine crack. In short what I'm saying is the sender was goosed.


John.
 
More than half the time my gauge reads zero and the sender has been replaced with a new one! As the warning light sender has been replaced too and the light only comes on before starting, I'm not worried.

Also, the engine doesn't sound like a rattling bag of spanners. When it does I'll be concerned.
 
Johnny E wrote,...
More than half the time my gauge reads zero and the sender has been replaced with a new one!
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Hi Johnny,

What does the new sender look like? Black plastic cylinder with a large nut beneath?

Ron.
 
It's been a while so I can't remember. I'll check and report back.

It seems to only read when it wants to though. I've been doing 70mph before now and watched it drop from 50psi to nothing in 10 seconds!
 
OK before I take car for extended run, and because i'm nowhere near it now - is the oil light the red one on the top left of the dash? If so that comes on then goes out when car starts - so maybe safe to assume sender - how do I test sender - multimeter?
 
CV35Ian said:
OK before I take car for extended run, and because i'm nowhere near it now - is the oil light the red one on the top left of the dash? If so that comes on then goes out when car starts - so maybe safe to assume sender - how do I test sender - multimeter?
Click to expand...

Hi , earth the wire from the sender ( ignition on ) watch the gauge , if it swings fully to the right then the gauge and wiring are o.k and likely the sender is U/S ( or you have zero oil pressure , but you'd know that , as said above it'd sound like a bag of spanners ! )
 
harveyp6 said:
CV35Ian said:
the oil light ~ comes on then goes out when car starts
Click to expand...

That's what it's supposed to do.
Click to expand...

Oi! :D

I know that, assuming that as light is working OK it could just be guage sender - or guage (I have a spare one of those).

Thanks

Ian
 
stina said:
CV35Ian said:
OK before I take car for extended run, and because i'm nowhere near it now - is the oil light the red one on the top left of the dash? If so that comes on then goes out when car starts - so maybe safe to assume sender - how do I test sender - multimeter?
Click to expand...

Hi , earth the wire from the sender ( ignition on ) watch the gauge , if it swings fully to the right then the gauge and wiring are o.k and likely the sender is U/S ( or you have zero oil pressure , but you'd know that , as said above it'd sound like a bag of spanners ! )
Click to expand...

Will do, and no it sounds lovely, spanners safely in tool box!
 
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