Oil Pressure Problems

[Benno31]

Gday All,

As of last night my oil pressure guage will read normal and then randomly and independent of rpm, will drop to almost 0. When the engine rpm is increased the pressure will rise but not as much as normal. It is reduced by about half of the normal readings at any given rpm.

I am wondering whether it is a voltage issue or guage issue or worst of all, an actual oil pressure problem.

Any insight into this problem is appreciated. Car is a 1989 GT-R.

Cheers,

Ben.

[d00dz]

To take a stab sender issue, seems like all nissans have the same problem.

Saw a thread bout this recently somewhere, cant remember where. :

[Benno31]

Thanks for the advice. I am hoping that is all it is. I didn't realise it was a common thing.

[James_03]

colar is most likely stuffed on the pump, again take it to a mechanic and get an independant reading done by removing the sender, but I would be betting on it being the colar.

yes it could still be the sender of cluster itself but I myself wouldnt be taking that risk.

I did once and I ended up rebuiling the motor.

Edited July 19, 2006 by James_03

[Bunta]

Bugger I threw out my cheap ass mechanical guage!

Get someone to put a mechanical guage on it...if it reads fine you will know that the sender is stuffed!!!

[MerlinTheHapyPig]

it's a common problem with rb's, i would recommend buying an aftermarket gauge to determine if you actually have oil pressure problems or if it's the stock sender.

[Benno31]

Thanks heaps guys. I will get onto my mechanic right away, see if he will come onsite to do it.

[N1GTR]

You should be able to drive it to the mechanics without issue

Also, the senders in RB's are shit. Plain and simple, invest in a good mechanical guage and dont look back

[TurboX]

Damn I just replaced the crank and rods and the Oil press sender (from another RB) and its doing the same thing and reading all over the place.

I thought it was just the gauge before but the clattering noise was a bit of a giveaway as well so expected problems.

Found out it was the countersunk screws in the back of the oil pump had come right out!

So dont think its the sender unless proven, but hopefully this time it is!

[Benno31]

I think I will avoid running the engine completely to be safe. can't afford a rebuilt right now.

Thanks heaps for the replies. You guys are lifesavers.

[d00dz]

I think I will avoid running the engine completely to be safe. can't afford a rebuilt right now.

Thanks heaps for the replies. You guys are lifesavers.

Yea I know the feeling. Dont know whats wrong with it and kinda hope its not anything bad. Seeing it read 0 is scarey. Esp when you dont or not plan for rebuilds.

[d00dz]

Oh I was browsing other places and I found the thread:

http://www.skylinesaustralia.com/forums/in...howtopic=126565

[Benno31]

Thanks again. Mechanic will be here tonight to do a manual pressure test.....

[MerlinTheHapyPig]

when my gauge reads zero... my mental argument is that the red warning light doesn't come on, so not to worry. When that light starts coming on, then i'll worry!!

My guage has been playing up for roughly a year, and i've been drifting the car, almost weekly. So, if something was wrong with the oil pump, i figure my engine would have blown itself up a long time ago

[Jolinator]

red light and gauge are independant, when the red light comes on you have no oil pressure. i have similier issues, mine always reads low, but i have seen it drop to zero when i came to a stop once, also it moves under heavy breaking.

Edited July 20, 2006 by Jolinator

[Benno31]

Well, good news. It is the sender unit. The car had 90PSI at cold idle.

Now to find a cost effective replacement, I hear the nissan genuine units are $220 odd.

A big thanks to Dan (3lit3 32) for taking the time to drive 45 minutes to help me out.

[hanyou]

thats liek mine... was about to make a thread about this... wen i start the car seems normal.. but after driving 15min it stays at 2 on the stock gauge for 32 gtr

[jantolis]

For some reason and for the first time in about 3 weeks, the guage seems to be working. It was reading almost zero after driving for a while but yesterday it was at 6 when starting then made it's way down to 2 and stayed there until i revved it and then it went up and then back down to normal.

Hopefully it stays working but i won't count on it.

[d00dz]

Yea its like that, the stock sender is crappola!

Sometimes it works sometimes it doesnt.

Just get an autometer oil pressure guage (they include the sender) for lke $100 off ebay and put that on. Works fine! Ive got one

[The Alchemist]

I replaced my sender unit with a new one, had similar problems, and also connected a mechanical gauge and compared the results to the original dash mounted GTR gauge.

Interesting results.......

While the mechanical gauge can be reading a steady figure say 45psi the Nissan gauge can vary between 2 to 3 KG/cm3 depending on its mood. Also at idle the mech gauge reads 30PSI rock steady the nissan gauge still reads high at around 40psi equivilent. At 4000rpm the mech gauge is up around 80PSI the nissan gauge still reads about 4 kg/cm3. So even with a decent sender the Nissan gauge is really a indicator that you have oil pressure, how much exactly can only be sorted with a good mechanical gauge fitted.

Mike