no oil pressure
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Tuned
Joined: Jul 2010
Posts: 435
Likes: 6
From: Kitimat British columbia
no oil pressure
Howdy I just rebuild my 272 y block and I had no oil pressure at an idle cold so I got a new pump and I installed it and I had 20 psi at an idle cold now I have 0 again not quite sure whats going on any tips from anyone? and one thing the old pump was geroter pump and the new pump is a gear one.
Thread Starter
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Tuned
Joined: Jul 2010
Posts: 435
Likes: 6
From: Kitimat British columbia
no I haven't I'm about to try it I pulled the pump I got 5psi at an idle now when I rev it up I get to about 10 than it sits thier and slowly creeps down, I appeared to have bein sucking air I'm thinking but somethings still wrong I will try a gauge than post back, "edit" and yes a brand new gauge, before I took the motor appart I had 60 with the old pump but it sat for 3 years after that.
Thread Starter
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Tuned
Joined: Jul 2010
Posts: 435
Likes: 6
From: Kitimat British columbia
well I tried a different mechanical gauage and I get the same reading, oh and thiers no oil going to the top end and I used the old cam bearings possible that I spun one?
Logistics Pro
Joined: Feb 2005
Posts: 3,952
Likes: 117
From: Upper Left Coast
You may also have a problem with the oil pump drive. Did you use a new hex drive or the old one?
I don't think you have damaged the engine. it doesn't take a lot of oil pressure to lube the bearings at idle rpm.
You do need to determine whats wrong though. if the oil pump is OK, you may have too much bearing clearance.
Try pulling your distributor and using a 1/4" deep socket and a speed wrench. By hand, you should be able to turn the pump enough to produce 25PSI or more.
I get 50 PSI when I turn mine (turn it CCW)........ you'll also know the pump is producing pressure because it'll be pretty hard to turn by hand...... If it's easy, the oil is going somewhere.........
If I remember correctly, there's an oil pressure regulator in the pump that is spring loaded. I wonder if the spring is broken or missing....or the plunger is stuck etc....
Elder User
Joined: Dec 2006
Posts: 559
Likes: 0
From: Redondo Beach, CA
Rebuilt engine with old cam bearings? Worn cam bearing will definitely give you lower oil pressure.
But also check oil pickup. You state you were sucking air? From where? Check the fittings and for cracks, both inside and outside of the pan.
But also check oil pickup. You state you were sucking air? From where? Check the fittings and for cracks, both inside and outside of the pan.
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Tuned
Joined: Jul 2010
Posts: 435
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From: Kitimat British columbia
yea it was the fitting into the pump was sucking I fixed that problem everywhere else is fine the pickup is clean, it's not sucking air now I was getting 0 oil pressure when I was sucking air now I get 5 psi at a cold idle
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Logistics Pro
Joined: Feb 2005
Posts: 3,952
Likes: 117
From: Upper Left Coast
Well,
5psi is better than nothing.....But you still have a problem.
That engine should easily do 50psi at idle with cold oil. (I can do 50 psi by hand crank!!)
You may be losing pressure due to the sloppy bearings and you might sll have an oil pickup problem.
Is this with straight 30w oil?
5psi is better than nothing.....But you still have a problem.
That engine should easily do 50psi at idle with cold oil. (I can do 50 psi by hand crank!!)
You may be losing pressure due to the sloppy bearings and you might sll have an oil pickup problem.
Is this with straight 30w oil?
Postmaster
Joined: Jul 2003
Posts: 2,688
Likes: 4
From: Southern Oregon
Well,
5psi is better than nothing.....But you still have a problem.
That engine should easily do 50psi at idle with cold oil. (I can do 50 psi by hand crank!!)
You may be losing pressure due to the sloppy bearings and you might sll have an oil pickup problem.
Is this with straight 30w oil?
5psi is better than nothing.....But you still have a problem.
That engine should easily do 50psi at idle with cold oil. (I can do 50 psi by hand crank!!)
You may be losing pressure due to the sloppy bearings and you might sll have an oil pickup problem.
Is this with straight 30w oil?
My first engine had a multitude of problems, even after a quack rebuilt it. But things werent helped with a dry start, zero oil pressure, for too long. It had a negative effect on the bearings. Crank wasnt hurt much. The guy was supposed to have reground it but didnt. Long brutal story.
Thread Starter
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Tuned
Joined: Jul 2010
Posts: 435
Likes: 6
From: Kitimat British columbia
Ditto on the 50 psi cold idle oil pressure, with regular output pump. I know it is a pain in the ***, but at this point, or shortly to come, I would pull the engine and see what is going on in the bearing dept.
My first engine had a multitude of problems, even after a quack rebuilt it. But things werent helped with a dry start, zero oil pressure, for too long. It had a negative effect on the bearings. Crank wasnt hurt much. The guy was supposed to have reground it but didnt. Long brutal story.
My first engine had a multitude of problems, even after a quack rebuilt it. But things werent helped with a dry start, zero oil pressure, for too long. It had a negative effect on the bearings. Crank wasnt hurt much. The guy was supposed to have reground it but didnt. Long brutal story.
Logistics Pro
Joined: Feb 2005
Posts: 3,952
Likes: 117
From: Upper Left Coast
Most "Y-guys" suggest using 15W-40 because of the additional zddp in the oil for the flat tappets.
I use 15W-40 in everything (Shell Rotella, Chev Delo400 etc)
Postmaster
Joined: Jul 2003
Posts: 2,688
Likes: 4
From: Southern Oregon
[QUOTE=HT32BSX115;9321000]10W-30 is probably ok. It should still make at least 50psi (cold) at idle with it....
Good point. There are a few 10/30 oils with adequate ZDDP. Valvoline VR-1 racing oil is one of them. Run of the mill 10/30 will wipe out your cam and/or lifters so use the right stuff.
I used the 10/30 VR-1 last year. This year it has been 15/40, because I had quite a bit already on hand.
Good point. There are a few 10/30 oils with adequate ZDDP. Valvoline VR-1 racing oil is one of them. Run of the mill 10/30 will wipe out your cam and/or lifters so use the right stuff.
I used the 10/30 VR-1 last year. This year it has been 15/40, because I had quite a bit already on hand.
Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
Rotella has a 10W-30 with sufficent ZDDP. I use it year round up here in ND and it gets cold here!
I see you reused the cam bearings but did you install a new cam? If so does it have the oil groove cut into the shaft. It seems to me you have to have someone with a lathe cut it for you. THis could prevent oil from getting to the top end.
Though, I belive the pressure port is after the filter not way up there. HMM?
Take off the filter and the coil wire to the distributor. Have someone crank the engine to see if you have oil coming out. I dont know why you switched to a gear pump. There is a reason that the industry switched to geroters. They pump more volume and pressure. Gear pumps also need to be primed. But if you have ran it several times it still should have sucked up enough oil to prime itself. Your oil pressure is danger low. I get about 60psi cold and 45 psi hot at idle.
I see you reused the cam bearings but did you install a new cam? If so does it have the oil groove cut into the shaft. It seems to me you have to have someone with a lathe cut it for you. THis could prevent oil from getting to the top end.
Though, I belive the pressure port is after the filter not way up there. HMM?
Take off the filter and the coil wire to the distributor. Have someone crank the engine to see if you have oil coming out. I dont know why you switched to a gear pump. There is a reason that the industry switched to geroters. They pump more volume and pressure. Gear pumps also need to be primed. But if you have ran it several times it still should have sucked up enough oil to prime itself. Your oil pressure is danger low. I get about 60psi cold and 45 psi hot at idle.
Thread Starter
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Tuned
Joined: Jul 2010
Posts: 435
Likes: 6
From: Kitimat British columbia
when I ordered the pump it came as a gear one, I'm thinking my cam bearings are shot so I might look for a doner truck and use that so I can move it without having to push it and than when I have a job again fix that engine