Oil Pump
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New User
Joined: Aug 2002
Posts: 7
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From: USA
Oil Pump
Is it common for the oil pumps to go in the 5.8L I have very low oil pressure when truck is warm if I change the pump will it fix it? and I was thinking of going with a high flow pump will that be ok and will it fit? how hard of a job is this? any info would be a big help
Senior User
Joined: Mar 2001
Posts: 277
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From: Milan, TN
Oil Pump
It's not the most uncommon thing in the world. Changing the pump should fix it, and a hi-flow pump would only pump more, which wouldn't hurt. I have a Meiling(sp...) pump in my truck, and the oil pressure guage (a real one) on my truck stays pegged. Changing the pump is a 
,but it can be done in your garage. I didn't have to pull the motor-I just used a cherry picker and unbolted the motor mounts. It lifted up just enough to do it. Of course you'll need gaskets. My gaskets and pump together were less than $35. The fun part is putting the rear main in.
,but it can be done in your garage. I didn't have to pull the motor-I just used a cherry picker and unbolted the motor mounts. It lifted up just enough to do it. Of course you'll need gaskets. My gaskets and pump together were less than $35. The fun part is putting the rear main in.
Junior User
Joined: Aug 2002
Posts: 57
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Oil Pump
Looks like your profile is not avail. Search this forum, this question comes up every week. If you've got an '88ish plus your gauge is not a gauge at all, but an idiot light that reads Normal above 4.5 lbs and zero below 4.5 lbs.
If you have high mileage I doubt a new oil pump will help you. The low op is most likely resulting from worn main bearings, etc.
If you have high mileage I doubt a new oil pump will help you. The low op is most likely resulting from worn main bearings, etc.
Senior User
Joined: Jul 2002
Posts: 137
Likes: 1
From: Gilbert USA
Oil Pump
Yah i have a 88 with a 302 and it does the same thing. I should probably change out the pump soon. Also exactly how do you change out the rear seal mine is leaking like a you know what. I just need to know how to do it too save some cash. thanks
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New User
Joined: Aug 2002
Posts: 7
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From: USA
Oil Pump
>It's not the most uncommon thing in the world. Changing the
>pump should fix it, and a hi-flow pump would only pump more,
>which wouldn't hurt. I have a Meiling(sp...) pump in my
>truck, and the oil pressure guage (a real one) on my truck
>stays pegged. Changing the pump is a ,but it can be
>done in your garage. I didn't have to pull the motor-I just
>used a cherry picker and unbolted the motor mounts. It
>lifted up just enough to do it. Of course you'll need
>gaskets. My gaskets and pump together were less than $35.
>The fun part is putting the rear main in.
__________________________________________________ ____________________
Cool I bought a Meiling hi-flow pump shaft and screen hope
it fixes it. thanks for the tip. how do I go a bought
changing the rear mail seal would it be easier doing it when
I have it all apart or is the rear main seal the back gasket on the oil pan?
>pump should fix it, and a hi-flow pump would only pump more,
>which wouldn't hurt. I have a Meiling(sp...) pump in my
>truck, and the oil pressure guage (a real one) on my truck
>stays pegged. Changing the pump is a
,but it can be >done in your garage. I didn't have to pull the motor-I just
>used a cherry picker and unbolted the motor mounts. It
>lifted up just enough to do it. Of course you'll need
>gaskets. My gaskets and pump together were less than $35.
>The fun part is putting the rear main in.
__________________________________________________ ____________________
Cool I bought a Meiling hi-flow pump shaft and screen hope
it fixes it. thanks for the tip. how do I go a bought
changing the rear mail seal would it be easier doing it when
I have it all apart or is the rear main seal the back gasket on the oil pan?
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New User
Joined: Aug 2002
Posts: 7
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From: USA
Oil Pump
ok when the truck is cold the oil pressure gauge reads between O and R and when it is warmed up it reads between L and N if it ever stops raining I am going to change the pump and in the mean time the truck is sitting and not going anywhere
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Postmaster
Joined: Aug 2001
Posts: 2,882
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From: Nevada
Oil Pump
I sure wouldn't change the pump until I put a real gauge on it and it showed under 25lbs at normal operating temps. Even then, it can run a long time. I've lost a couple of oil pumps in various engines, and when they went it wasn't a gradual thing. If you put a real gauge on it, I have an '82, it originally had the idiot light sensor, and you still show below 25lbs, it's more than likely bearings, not the pump.
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Senior User
Joined: Mar 2001
Posts: 194
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From: Austin USA
Oil Pump
Check on the use of a high flow oil pump. I have heard this can cause a lot of problems. I really don't remember what someone told me once, but I was going to put a high volume high flow oil pump in mine and was strongly suggested against it...
Senior User
Joined: Mar 2001
Posts: 277
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From: Milan, TN
Oil Pump
You can do the rear main whole you have the oil pan off, even if the motor and tranny are just lifted, not pulled. I did it and it doesn't leak. It's just a lot easier to do it if the motor is completely out of the truck. I just didn't have the time to do that(I needed it the next night, so we had a long night under the old '83...).
Senior User
Joined: Feb 2002
Posts: 217
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From: Motor USA
Oil Pump
Just to add or reiterate what most have said. Add a gauge. The idiot light could also be functioning improperly. I have a buddy who has his own shop and he ran his 79 Bronco with 0 oil pressure on the gauge at idle for almost 3 years. He figured it was just a back and forth to work vehicle so if it broke it really wouldn't strand him. It then became an issue of just seeing how long it would run like that. It never did die. He finally replaced the motor at 223,000 miles.