I have an L28 which has recently been rebuilt (1000klicks ago) and have noticed lately that the oil pressure gauge is showing lower than where it normally resides on the gauge when the motor was first installed.

It is just reading about 1/4 on the standard oil pressure gauge which has made me check the oil on several occassions. This is fine and the oil is only 400k's old and I am running a 20-50W Pennzoil.

I suppose what I am looking for are any hints that there is nothing seriously wrong inside.

Thanks

Biker

Datsun oil pressure sending units are notorious for working erratic. My daily driver (81 ZX) sometimes reads 30 psi and other times reads 70psi. And like you I've checked the oil several times to find out that it is just fine. I no longer pay any attention to the guage as long as it reads some pressure.

That may be true, but when the sending unit is bad I replace it. It's not the only thing that can cause a low pressure reading. I've replaced one in eight years on the Z and never on the 810 so I'm not really certain that they are inherently erratic.

I recommend using only Nissan oil sending unit . I have tried aftermarket and was not satisfied. For many things ,aftermarket parts are fine , this isn't one of them . In my openion . Gary

Thanks Guys

Might replace the sender (it was only put on about 18 months ago and is aftermarket).

Just makes me nervous looking at the gauge of late. :nervous:

Biker

mine gets to ~20 idling which has me a bit worried. the gauge is as accurate as you can wish. not too concerned though cause it's going in the shop in about a months time.

edit: i'm not using the stock gauge so ignore me...

Other possibility is the actual guage has gone faulty. As Sblake said though lots of people have said they read inaccurately however I've found them to always be quite correct.

Ive got a l28 and no oil pressure. It got a after market guage. But it only reads at 5 psi. When idling and the vlaves clatter. Sending unit and oil pump are on the way.