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2.4L : Ugh! oil pump lost prime? what to do? #1103589 07/07/17 07:17 PM
Joined: Aug 2007
Posts: 262
T
TresMon Offline OP
Mudrunner

Howdy,
I installed a new oil pump on my Raider (2.4 L) a year ago. Twice since then the oil pump apparently lost prime on me while I was way back in the mountains off road. I'd shut the engine down for whatever reason, to fish etc. Then back to the vehicle... when I fired it up...ZERO oil pressure. Not good because I was WAY the heck back in the mountains on a REALLY rough jeep trail.

The first time this happened I began to start and stop the motor in quick bursts. It took like 20 cycles before she built oil pressure. I don't know if this was a smart fix, a total fluke, or God Saving me from a REALLY long walk out in the dark in bear country. But it worked.

Many months later I found myself in the same exact minor emergency again. This time the Raider was parked slightly down hill. I Fired it up to head home and yep...ZERO oil pressure so I immediately shut it down. I pulled the stick and she was 3/4 of a quart low. Which gave me an idea.
I had my chain saw & bar oil with me. I theorized that if i poured some bar oil into the top of the motor, some of it would flow to the front of the head, down the front of the motor to the top of the oil pump and perhaps...reprime the pump. I tried it and it worked. She started up and immediately built oil pressure.
Again I have no Idea if this was a savvy fix, a fluke, or God bailing me out.

Now it has happened again. And I have tried both these former shenanigans and they have not worked. out of desperation I drained all the oil out of the motor.
I then got the biggest funnel that would fit in the filler neck and dumped all the oil in the valve cover fast as I could, ran to the ignition and fired her up, again theorizing some of the oil flooding the top of the head would run off down the front of the motor and onto the oil pump. It didn't work. Zero oil pressure.


So are there any tips tricks or techniques to get the oil pump reprised...or am I simply going to have to tear into the front of the motor to get to the oil pump??

Much thanks in advance.
TM



--Tres
(John 14:6)

Black 87' Raider
2.6L/Webber 88
5 Speed
Welded front,tight LSD in the rear
Removed bump stops
4'x6' roof rack
10k. Lb. winch on receiver hitch/custom bumper
100 amp alt
CB radio/AC inverter
S.Winch hubs
Enormous RV battery
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Re: 2.4L : Ugh! oil pump lost prime? what to do? [Re: TresMon] #1103595 07/11/17 01:21 AM
Joined: Aug 2007
Posts: 262
T
TresMon Offline OP
Mudrunner

Help? Anyone?


--Tres
(John 14:6)

Black 87' Raider
2.6L/Webber 88
5 Speed
Welded front,tight LSD in the rear
Removed bump stops
4'x6' roof rack
10k. Lb. winch on receiver hitch/custom bumper
100 amp alt
CB radio/AC inverter
S.Winch hubs
Enormous RV battery
Re: 2.4L : Ugh! oil pump lost prime? what to do? [Re: TresMon] #1103596 07/11/17 01:39 AM
Joined: Jan 2002
Posts: 6,129
TOASTY Offline
Trail Leader
*****
Maybe it's the gauge? I had a 2.6 do a similar thing and I switched to a mechanical gauge, everything was fine after that.


1999 Montero Blizzard package

1991 Montero RS
Re: 2.4L : Ugh! oil pump lost prime? what to do? [Re: TresMon] #1103598 07/13/17 07:03 PM
Joined: Aug 2007
Posts: 262
T
TresMon Offline OP
Mudrunner

It can't just be the gauge. She starts up and runs fine, but hammers like a diesel.


--Tres
(John 14:6)

Black 87' Raider
2.6L/Webber 88
5 Speed
Welded front,tight LSD in the rear
Removed bump stops
4'x6' roof rack
10k. Lb. winch on receiver hitch/custom bumper
100 amp alt
CB radio/AC inverter
S.Winch hubs
Enormous RV battery
Re: 2.4L : Ugh! oil pump lost prime? what to do? [Re: TresMon] #1103599 07/13/17 09:19 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
Originally Posted by TresMon
I installed a new oil pump on my Raider (2.4 L) a year ago. Twice since then the oil pump apparently lost prime on me while I was way back in the mountains off road. Now it has happened again.


I thought the oil gauge was a good suggestion - guess not. Why did you replace the oil pump?

I have never heard of pump losing prime, unless low on oil. I have worked on oil pumps (not Montero) replacing gears/seals, just pre-grease them and start the engine, the vacuum created on start pulls (actually air pressure pushes it) oil into the pump. After shut down the oil should leak back to pan - so re-prime every time. I think prime would apply if check valve in intake tube.

Is it possible a seal has gone?


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles







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