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Erratic oil pressure.


jeremybu

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Could high oil temp cause the pressure sender to fail?

 

Since the oil temp rose to near the red on a Spa trackday, the pressure guage has been all over the place. Strangely, the pressure reading drops when the revs rise. As the car seems to be running OK, I suspect, as per usual, it's a sender problem. Is this a probable cause?

 

Thanks for any replies.

 

 

 

1.6 SV - GJ02JLO - If there's one thing I've learned, it's that it should have been something else.

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That's the plan I think Steve, but do you think the oil temp could have wrecked the sender or would it just be coincidence?

 

1.6 SV - GJ02JLO - If there's one thing I've learned, it's that it should have been something else.

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1. Have you tried soldering the sender wire directly on to the tag?

2. Have you tried earthing the sender? A hose clip round it with a take off lead to a good earth could do the trick.

This completely solved my 'I think I have a problem with my oil pressure sender' problems.

 

Yours could be good old knackered of course...

 

 

Don't forget to add lightness :-)

My 2002/2003 racing pics

here

General pics (mostly of 7's and cars).

here

 

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It has been my experience that the claerbont senders start to behave irratically when they have seen high oil pressure on start up. I had three fail over two weeks on my Duratec engined car and they were all remote mounted away from any vibration and water. Not fit for purpose IMHO.
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The car did have an oil change between the 2 days. There was no problem on the first day, and all this began on the second day.

 

After various searches on here, I think it could be a case of windage. First thing I think I'll try is taking a litre of oil out and run it and see if that sorts it.

 

If not then Plan A it is.

 

Thanks for the help so far.

 

1.6 SV - GJ02JLO - If there's one thing I've learned, it's that it should have been something else.

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Pressure has not gone above 4 (as per usual) but drops to below 1 on motorway cruise which it has never done. This, along with the substantial temp rise (again oil has always sat at around 80) leads me to the windage theory.

 

1.6 SV - GJ02JLO - If there's one thing I've learned, it's that it should have been something else.

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Always fit an oil pressure warning switch / f'off big or bright light so you see it.

35psi will warn you early enough. That way you have a back up and these ARE very reliable,

 

Don't forget to add lightness :-)

My 2002/2003 racing pics

here

General pics (mostly of 7's and cars).

here

 

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7-8 bar.......which I wuld have thought should be within the spec of the sender but I don't know the exact spec of the sender so I could be wrong.

 

Whatever causes these to fail is irrelevant, Caterham should be supplying a sender which works and is reliable in the application for which it is being used.........can it really be that difficult?

 

Simon Bell - Caterham 7 Duratec R

I`ve seen the future.....and it`s powered by duratec Check out the website here

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