Oil pressure shut down - real time help needed

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Joined
Dec 15, 2004
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Location
Folsom, CA
Guys,

I finally got everything buttoned up on my new cooling system and I fired her up, she ran for about 10 sec, then died. Oil pressure gauge (stock, not mechanical) has no reading. So of course it must be a bad connection to the oil pressure switch, right? Well I checked those and everything appears to have good conections. When I say everything, there are 2 units off the side of the block (3B) that have wires connecting to them. One, acording to my FSM, appears to be the oil pressure switch. The other is a round unit with 2 wires connected to it. One is a flat connection, the other is like a little disk that has a flat connector sliding over it....I don't know what the hell that is (can someone tell me?...see pic)

I even went so far as to replace 2 of the 3 connectors with new ones cause they looked rough. I checked the wires up the harness a ways and everything looks cool....still, no oil pressure on the gauge, still it runs for 10 sec then shuts down.

OIL COOLER FACTOR?

Now when I put in the new rad you might remember I removed an aftermarket (AXT) oil cooler that was installed behind my old rad. There were 2 hoses that ran from underneath the oil filter mount that I simply removed and plugged with flat plugs (see photo)...obviously one was a line from the oil filter mount TO the oil cooler, and one was a line FROM the oil cooler back to the oil filter mount. Now am I missing somehting here? Since this is an aftermarket oil filter mount supplied by AXT specifically for the oil cooler, did I F&^K something up by just plugging the two holes? It seemed logical to me that if both the in & the out lines were plugged, this would be no problem...Am I wrong??

One more thing...when it runs for the 10 seconds and then shuts down, its making a weird "hollow" noise after the engine dies....maybe I'm crazy but it sounds like things are spinning with no lubrication? Maybe I'm just paranoid?? Yes, there is plenty of oil in the pan.

Help!
 
I'd guess the adapter may be there to shunt the oil to the cooler and back, so when the holes are plugged, no oil is getting around... Plug the system back in (the radiator doesn't have to be mounted in place and see. Or take the adaptor out.

Dave
 
The low oil pressure switch works by grounding out so if the wire is off the connector it won't shut down. The round "can" is the oil pressure sender for the stock gage.
I'm with Dave on the oil cooler thing. The 3B has a gear driven oil pump right off the crank. Unless it was left out during a rebuild it HAS to work! It's not like the F/2F that are driven from the distributor.
 
ya, I had a feeling....those electrical connections are good so I'm thinking you must be right....it's got to have something to do with plugging up that AXT oil filter apaptor. I'm going to phone AXT to confirm....

Installing that bloody oil cooler is easier said than done...it's in a bitch of a spot. I sure as hell hope I didn;t do anything to my turbo by firing it up a few times with no oil pressure...that would really suck!
 
cruiser_guy said:
The low oil pressure switch works by grounding out so if the wire is off the connector it won't shut down. The round "can" is the oil pressure sender for the stock gage.
I'm with Dave on the oil cooler thing. The 3B has a gear driven oil pump right off the crank. Unless it was left out during a rebuild it HAS to work! It's not like the F/2F that are driven from the distributor.

Cruiser Guy...so you think it's plugging up this adaptor that's causing no oil pressure?
 
dieselbigot said:
ya, I had a feeling....those electrical connections are good so I'm thinking you must be right....it's got to have something to do with plugging up that AXT oil filter apaptor. I'm going to phone AXT to confirm....

Installing that bloody oil cooler is easier said than done...it's in a bitch of a spot. I sure as hell hope I didn;t do anything to my turbo by firing it up a few times with no oil pressure...that would really suck!
the turbo will not be hurt since the load would be non-existent, i wouldn't do it for long but the few seconds that you tried it, you will be fine...
send a pic of where the line was removed from...
cheers
 
dieselbigot said:
Cruiser Guy...so you think it's plugging up this adaptor that's causing no oil pressure?

Hard to say. I've never seen an aftermarket oil cooler for a 3B. All 3B's I've ever seen have a stock oil cooler on the block only.
I can say though that the 3B oil pump is going to be pretty tough to have NOT working being as it's off the crank and all. I can't imagine that the oil pump, even if well worn, would develop NO oil pressure.
 
oil pressure

The smaller sending unit of the two signals the edic motor to shut off the fuel if oil pressure is below 5psi.

Sounds like by plugging these fittings the oil flow route has been dead headed.It is a wonder it didn't blow the filter apart.

Quick fix would be to make a small loop IN/OUT right at the adaptor fittings.

As long as it was just idling start/stops ,and not too many , you should be fine.

Steve
 

Wayne...the pic at the top of the post on the left is the best pic I could get. It's the top of the oil filter pointing down to the driveshaft. You can just make out below the oil filter, two hex plugs...those are where the in/out hoses where...
 
Brett,

Sorry I did not see this sooner, I have an oil cooler with the same adapter that goes on below the oi filter you need to remove the adapter. Pull the oil filter and there is one bolt/nut in the center that one removed the adapter will come right off, then place your oil filter back on and you are set. If you really do not want to remove the adapter, then you must run an oil line from the inlet to the outlet (loop). But it is really easy to remove and will give less disruption of the oil flow.

Michael
 
tlcruiserman said:
Brett,

Sorry I did not see this sooner, I have an oil cooler with the same adapter that goes on below the oi filter you need to remove the adapter. Pull the oil filter and there is one bolt/nut in the center that one removed the adapter will come right off, then place your oil filter back on and you are set. If you really do not want to remove the adapter, then you must run an oil line from the inlet to the outlet (loop). But it is really easy to remove and will give less disruption of the oil flow.

Michael

Man I love this forum...just the answer I was looking for...an easy fix! Thx Michael!

Cheers

B
 
dieselbigot said:
Man I love this forum...just the answer I was looking for...an easy fix! Thx Michael!

Steve Morris (Little Joe) said it first! :)

Cheers
 
mikeyT said:
Steve Morris (Little Joe) said it first! :)

Cheers

Yes indeed he did ;) I just didn't know that removing the adaptor plate was so easy....problem solved. Anyone need a used oil cooler? ;)
 
dieselbigot said:
Yes indeed he did ;) I just didn't know that removing the adaptor plate was so easy....problem solved. Anyone need a used oil cooler? ;)

I think Beanz might be in the market for one.
 
Thanks, Michael. I was looking for a bypass adapter actually. Brett's sounds like it is an inline unit.

Dave
 
Alternative connection for the oil cooler

From my experience, i think this is the best place to connect the oil cooler lines, I use this in two B engines and in one 3B engine and works really good.
Anyone already used this too???

Francisco
 
That's off the stock oil cooler.
 

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