Causes of low oil pressure?

[Sunray]

My bus has a new engine from Remtech in it and after about 180 miles, the buzzer goes off.

Mechanic has tested it for pressure and says its OK. I was wondering if it was a dodgy circuit so replaced it and similar problems. So to see what exactly was the problem and as an alternative to that circuit board I replaced it with a simple circuit of two leds and got a cheap tacho.

Very informative and I wish I'd done it ages ago.

From cold the low pressure switch will go short circuit and the high pressure one will switch over immediately even at next to no revs. As the engine warms up, the revs that the switch requires to switch gets progressively higher and higher. I drove round the block a few times and the revs it needed to get to was approaching 3000 rpm before it was switching over at which point I stopped. The engine was not even fully warmed up.

Clearly some time before this state of affairs, if I had it fitted, the buzzer will go off.

Both switches were replaced at the request of Remtech. I suspect an engine issue, two switches and two circuit boards same problem. Circuit is perfect, tested out twice.

Any suggestions as to what might be wrong?

[shepster]

You say the pressure has been tested and is ok but how was this done?

I guess you need to know if the pressure is really ok, maybe fit a remote gauge, and if it is then obviously it's either a sender or circuit problem.

If however the pressure IS low then it could be any of the following.

Oil pump.

Old/shyte oil.

Pressure relief valve maybe.

[Plasticman]

Just fit a wet gauge and be done with it
mike

[Sunray]

It was tested with an oil pressure gauge by the mechanic who fitted the engine.

[Sunray]

Just fit a wet gauge and be done with it
mike

I was looking at fitting one, but it's not obvious. Due to space constraints I think I'd need to get a pipe, adapt the m10 fitting to 1/8th NPT to fit the sensor. Quite a hassle.

[Plasticman]

look at someone like http://www.thinkauto.com/" onclick="window.open(this.href);return false; we buy all the aeroquip stuff from them , they will have the fitting you require, not cheap,no but cheaper than an engine and always working honestly hot/cold whatever they dont lie like an electric sensor can, these adaptors would allow you to retain the original sensor as well http://www.thinkauto.com/earlywarning.htm" onclick="window.open(this.href);return false;
mike