Ford NAA engine oil pump

[barnerr]

I have a Ford NAA tractor that I recently purchased. The engine was seized. I took the engine apart, got it turning, put new rings in and put it back together. The bearing looked to be fine. I put new oil and new filter on it. I tried to get oil to the top by removing the distributor and turning over the oil pump. I got very little pressure. I decided to get a new oil pump. With the new pump installed, I still get minimal pressure. There are signs of oil in the lifters and a little to the rocker arms but not what's needed. I took the oil filter off and tried pumping to see what came out; again minimal oil flow. What's wrong and what am I missing?

 

[JMOR]

(quoted from post at 08:04:25 04/28/23) I have a Ford NAA tractor that I recently purchased. The engine was seized. I took the engine apart, got it turning, put new rings in and put it back together. The bearing looked to be fine. I put new oil and new filter on it. I tried to get oil to the top by removing the distributor and turning over the oil pump. I got very little pressure. I decided to get a new oil pump. With the new pump installed, I still get minimal pressure. There are signs of oil in the lifters and a little to the rocker arms but not what's needed. I took the oil filter off and tried pumping to see what came out; again minimal oil flow. What's wrong and what am I missing?

urning pump in proper CW direction? Cam has slot that allows/interrupts flow to valve train, but this would not impact pressure on gauge connected to factory connection on engine block. Oil suction line joints all tight?

 

[Two0aks]

Hi JMOR

I hope this isn't considered a hijack, but when I did similar to barnerr with a new pump in a complete restored 134 and started to spin the pump thru Dist., oil gushed out the opening. I had to take a Crutch Tip w/drilled hole and pressed it into Dist. hole and was then able to observe pressure on gauge.

The reason I mention this is I've not seen anyone talking about potential (oil splatter) issues while manually spinning the pump with a drill motor. Is it just me. Oil filter can filled because dipstick showed lower level than before I began.

 

[used red MN]

From what I see on JMORs diagram the red arrow he
shows pointing in below the distributor gear is an oil
passage. As he shows that is part of the pressurized
oil system. If you just have a screwdriver bit chucked in
your drill it is not sealing off the passage as the shaft
would below the distributor gear, see link. Thus
pressure is leaking off there.
Editing to add: I was thinking you were reading oil pressure. I went back and looked and saw what you posted about the flow that came out when the filter was off. First you do not tell us exactly how you are turning the pump, there is a lot of difference between turning it by hand and turning it with a drill. Never worked on a Ford but just by look at a block online it should squirt out of that filter hole with some spraying force to direct a stream away from the engine. A good estimation would be a couple cups worth in 5 seconds or a bit more. If it does not then indeed there should be some concern. If you are doing this with a screwdriver in your hand then I cannot really give you any estimation of what you could expect but it probably would not be much more than the descriptions you have given.
Example distributor


This post was edited by used red MN on 04/28/2023 at 03:14 pm.

 

[barnerr]

I've tried a couple of things:
1.) I used a drill to turn the oil pump. I did have some oil splatter so I sealed the hole with a rag. Something noteworthy, the pump is gurgling when I turn it over just as the old pump did.

2.) I put the distributor back in, removed the spark plugs, filled the pump through the screw hole below the distributor and turned the engine over with the starter. Very little oil flow. I pulled the oil filter off and observed the flow by turning over the engine with the starter. Very little flow.

There is a little oil around the push rods and a little around the rocker arms but not much. The oil filter has oil in it so it must be flowing some oil into it.

I've taken these engines apart before but never had this kind of problem before.

 

[JMOR]

(quoted from post at 08:28:56 05/01/23) I've tried a couple of things:
1.) I used a drill to turn the oil pump. I did have some oil splatter so I sealed the hole with a rag. Something noteworthy, the pump is gurgling when I turn it over just as the old pump did.

2.) I put the distributor back in, removed the spark plugs, filled the pump through the screw hole below the distributor and turned the engine over with the starter. Very little oil flow. I pulled the oil filter off and observed the flow by turning over the engine with the starter. Very little flow.

There is a little oil around the push rods and a little around the rocker arms but not much. The oil filter has oil in it so it must be flowing some oil into it.

I've taken these engines apart before but never had this kind of problem before.

ight want to verify the piping, fittings, gaskets around oil pump suction and discharge.. "Gurgling' might be a sign of sucking air?

 

[Two0aks]

My 2

Since the pan was off you no doubt got the pump pickup tubes correct ? I'm pretty sure they only go on or fit one way.

Also without doubt the drain plug screen is clean ? and oil level is correct too.

I also believe turning the oil pump with the drill motor should show pressure as it turns faster than engine cranking speed.

If you removed the oil pipe that goes to the side of the block, did you put the rubber washer back in ? At least I seem to remember there being one. Parts Cat. shows 66644 I think.

 

[JMOR]

(quoted from post at 11:22:04 05/01/23) My 2

Since the pan was off you no doubt got the pump pickup tubes correct ? I'm pretty sure they only go on or fit one way.

Also without doubt the drain plug screen is clean ? and oil level is correct too.

I also believe turning the oil pump with the drill motor should show pressure as it turns faster than engine cranking speed.

If you removed the oil pipe that goes to the side of the block, did you put the rubber washer back in ? At least I seem to remember there being one. Parts Cat. shows 66644 I think.

peaking of plugs......that oil gallery that runs beside cam (see picture) has a screw-in plug at both front and rear.

The one at rear is (I believe) behind this gear cover.

Rubber washer that Oaks is referring to.

 

[jimtrs]

(quoted from post at 08:28:56 05/01/23) I've tried a couple of things:
1.) I used a drill to turn the oil pump. I did have some oil splatter so I sealed the hole with a rag. Something noteworthy, the pump is gurgling when I turn it over just as the old pump did.

2.) I put the distributor back in, removed the spark plugs, filled the pump through the screw hole below the distributor and turned the engine over with the starter. Very little oil flow. I pulled the oil filter off and observed the flow by turning over the engine with the starter. Very little flow.

There is a little oil around the push rods and a little around the rocker arms but not much. The oil filter has oil in it so it must be flowing some oil into it.

I've taken these engines apart before but never had this kind of problem before.

Not sure you got a problem. I stopped trying to get oil pressure this way a long time ago. Doesn't usually work for me.

If you've lubed all your surfaces during the rebuild you'll be fine for testing.

You got a bit of oil showing up, so i would button it all up and start the engine. Watch for oil pressure in the first 10 -- 20 seconds. If nothing, then shut her down and start troubleshooting.