Isuzu npr oil pressure light on - Cars & Trucks

Gearbox oil and transmission oil for ISUZU ELF

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Best-selling products: Transmission fluid ISUZU ELF vehicles · Version: SHC · Oil Viscosity Classification SAE: 75W-90 ...

Not enough oil, wrong bearing shells?

In the link

https://www.google.com/search?q=4BD2+isuzu+NPR+crankshaft+and+connecting+rods+bolt+torque

..

try dealer

this is no NPR forum.
not even close, just cars and light trucks 4k or less.
not 27,000 lb ones.
hope you get lucky,
I buy the book, so can do work and not beg for 1000 pages 1 by one.

go to isuzu,
walk in
and buy the book on your big truck.
I do not think there is any online big truck support books.
nor in Autozoned.
sorry....
or get it serviced?

btw, no engine stated.

most likely a light relay full of water

youd need the NPR heavy truck, FSM book page on radio wiring
buy book at any Isuzu heavy truck dealer.
we dont now what radio option cam on that NPR
nor what country , other countries use different radios.
so..... this is USA forum, and we dont have NPR books.

this is no heavy truck forum. its only light and cars.
NPR what, (the number)
and what engine? fuel parts match up to and engine.
no year NPR. wow. and have gas or diesel engines.
no fuel stated either.
NPR started in USA in 1985 (this is USA forum)
this?

What the dash lights show which are on ? Is it something like battery,something like engine,something like oil can,something like a circle with this(!) .Please specify to help.

It is a bit new to have a serious oil problem.
Never heard of a "referential" seal. I am familiar with rear main seal and differential seal.
But first you need to find the leak.
The thing to do is steam clean the engine so that you can see better.
(avoid heat or water around alternator, starter, ignition, etc)
Then put cardboard under it.

Also a bad PCV can cause excess crankcase pressure that forces oil out.
Top valve cover gasket is very common.
Rear main seal will come out from bell housing bottom.
You might also want to consider thicker oil, like Castrol 20W-50.
Oil pressure sending units also often leak.
Filter could be not sealing right, due to things like left over seal, etc.