www.jec.org.uk

I recently changed my gauge in the dashboard in my 3.6 for a gauge from a V12. I now get a reading, but it is low (about 30psi). The sender has not been changed. Is the V12 gauge the same calibration as a 6 cyl or should i just replace the sender?

Hi Mark and a warm welcome to the XJS Forum

I presume you couldn't get a 3.6 gauge? If so, should you be unable to sort the problem I have a complete 3.6 instrument binnacle that you could fit, or break as required (shows 79,000 miles).

Regards
Tony

The parts catalogue list the V12 and 3.6 gauge as being the same C46145

I assume you have made sure the electrical/earth connections on the instrument binnacle and sender are in good order?

Mark,

At what engine speed is it showing 30psi?

The oil pressure for a six cylinder is about 2.75 bar at 2000 rpm which is about 39 psi. So 30psi might look a little low but it's not awful.

However, the more likely reason for the gauge reading is because if you have fitted a new sensor and because of this then the gauge is probably not reading accurately anyway. The revised Jaguar design sender LHD5642AA was brought in to counter (mainly American) criticisms that the oil gauges were dropping at idle and when the oil was hot (as you would expect them too!). So Jaguar brought in a new design which is basically an on /off switch. This makes the gauge sit steady in a fixed position but doesn't really tell you what is the correct pressure.

So, you may well have no problem at all. If you really want to know the accurate pressure, the only way to do it is to connect an external gauge.

I hope that helps.

Good luck

Paul

I was a bit worried about my oil pressure reading, 2 faulty electric senders later I fitted a mechanical guage on to the engine to get a acurate reading.