NissanDiesel forums

Nissan diesel engines, and the people who love them
It is currently Sat Oct 20, 2018 11:17 am

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Low oil pressure
Post Number:#1  PostPosted: Sun Jul 09, 2017 9:26 pm 
Offline
User avatar

Joined: Tue Oct 04, 2011 8:40 am
Posts: 14
Location: Lethbridge Alberta Canada
My truck a 1968 Datsun 520 with a sd 22 lost all oil pressure this weekend. I drained the oil and changed the filter but it did not help. The truck starts fine but the idiot light flashes and the gauge reads 0 psi. What could be causing this. Is the engine done or could it be something that is fixable? Thank in advance for your help.

_________________
My Build Thread
viewtopic.php?t=2370


Top
 Profile  
Reply with quote  
 Post subject: Re: Low oil pressure
Post Number:#2  PostPosted: Mon Jul 10, 2017 5:22 am 
Offline

Joined: Fri Aug 31, 2007 6:49 am
Posts: 821
Location: Cochrane Alberta Canada
Do you have a mechanical oil gauge on the truck ? ( other than the factory installed unit )

I would start by hooking a "KNOWN GOOD" gauge in the spot that the idiot light sender hooks to and read what you get.

It could be a faulty sender unit.

If it's not faulty, and there is minimal or low oil pressure then you would have to remove the oil pan and the oil pump and have a look there. I believe that the pan is removable within the truck, a;though on a 520 I'm not so sure. The availability of an oil pump may be a challenge. You can take the oil pump apart as well and have a look in it and see whats up. Stuck pressure relieve valve, broken spring, or just wore out etc.

If in fact there is no, or real low oil pressure, then how long the engine ran during that time will determine if it's "DONE" or not.

If your concerned about how much damage may have been done you can always take one connecting rod cap off when you have the oil pan off and have a look at the bearing and the journal for how bad it's worn. Maybe even pull the center main bearing cap as well and have a look. They can be put back on and re-torqued ( making sure they go back on the same direction they came off of course ).

Good luck and let us know what you find.

_________________
Retired Pauly
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC
KJLGD21FN


Top
 Profile  
Reply with quote  
 Post subject: Re: Low oil pressure
Post Number:#3  PostPosted: Mon Jul 10, 2017 7:50 pm 
Offline
User avatar

Joined: Tue Oct 04, 2011 8:40 am
Posts: 14
Location: Lethbridge Alberta Canada
Well don't I feel dumb... I he wire for the oil pressure sensor was off and grounding out on the frame causing it to stall and turn on the dash light. As for the gauge I have it plumbed into the oil supply for the old vacuum pump, and I don't think it is reading properly.

_________________
My Build Thread
viewtopic.php?t=2370


Top
 Profile  
Reply with quote  
 Post subject: Re: Low oil pressure
Post Number:#4  PostPosted: Mon Jul 10, 2017 9:45 pm 
Offline

Joined: Thu Feb 28, 2013 8:41 pm
Posts: 405
Location: Vancouver Washington USA
I have had all my oil gauges plumbed to that vacuum pump oil source using a "T" except the 720 turbodiesel, they all have worked properly.
The 720 I bought a pancake oil filter adapter with outlets for oil accessories such as gauges as I did not want to deal with trying to get in there to pipe the oil gauge, that adapter would make a good source for a turbocharger oil source also.

So all is good now, I would still be looking for an SD25.

_________________
I know the voices are not real,
but they have some really good ideas.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group