Worried about oil pressure
#1
Worried about oil pressure
Recently I started seeing my oil pressure sag down to 2 or so from 6 - 8 when the engine is hot. It started happening about the time I had bad leaking in the timing chain tensioner and distributor. Those are both fixed however I have developed another leak somewhere as I still get some drops of oil on my uncercarriage. Because of the recent leaky nature I have checked my oil every 200 miles or so and it has been low on occasion but not below the add quart mark so it has never been starved for oil.
I read somewhere the Xj40's were notorious for a 'lazy oil gauge.' I suppose I should have an oil pressure test done but is this a symptom of a huge problem or is it a normal or easy fix? How bad is it for the car to run like this( it has fine pressure while moving but at lights etc it sags.)
Thanks for the help
I read somewhere the Xj40's were notorious for a 'lazy oil gauge.' I suppose I should have an oil pressure test done but is this a symptom of a huge problem or is it a normal or easy fix? How bad is it for the car to run like this( it has fine pressure while moving but at lights etc it sags.)
Thanks for the help
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I suspect this will turn out to be a flaky pressure sender. My own car went through a period a couple of years ago when the oil gauge would drop down to 1 at hot idle, when it had previously always sat at two kPa on the gauge. Though it quickly rose with engine revs it did concern me enough to have the oil pressure propperly measured by a garage. There was nothing wrong with it; the only fault was the sender unit. Luckily this spontaneously repaired itself when I threatened it with replacement.
Real oil pressure problems on these Jaguar engines are very rare. The sending unit however seems far less robust. In fact early in the life of the X300, Jaguar moved to a simple on off switch for the oil pressure level, which indicates half way on the dial if there is some pressure detected. This is the unit they sell for the XJ40 now, if you buy a replacement. They are a pig to fit though!
Real oil pressure problems on these Jaguar engines are very rare. The sending unit however seems far less robust. In fact early in the life of the X300, Jaguar moved to a simple on off switch for the oil pressure level, which indicates half way on the dial if there is some pressure detected. This is the unit they sell for the XJ40 now, if you buy a replacement. They are a pig to fit though!
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