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NAA - Rebuild - Oil Pump Stuck??

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ReidS TN-NAA

08-28-2005 19:50:39

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Almost done with rebuild/overhaul of ol' Henry my trusty NAA. Down to putting freshly painted sheet metal back on and decided to spin the oil pump around to see if I could build up some oil pressure or at least prime the pump a little. 14V cordless Milwuakee wouldn't turn the oil pump at all. UH OH - I am thinking - somethings wrong. Off came the oil pan, out comes the oil pump. Seems like I may had left off a gasket maybe or never got one in rebuild kit. I determined that the gears of the oil pump were binding on the bottom plate that the oil tubes hook up to on pump. I carefully made a thin cardboard gasket that basically shimmed the plate away from the gears 0.01"-0.02" thick. It was lightweight cardboard and seemed to be good gsaket material at the time. Bolted everything back together - spins fine now. However I still coulnd't build any oil pressure (on the gauge anyway) by spinning oil pump shaft with dist out. I haven't turned the engine over yet. Should I be seeing oil pressure on gage without turning engine over? Also - is there supposed to be a gasket between oil pump body and bottom plate?? Will my homemade gasket be OK for a while? Seems like most gaskets you get are thin paper anyway. Anyway, glad I tried the thing before I stuck dist in and tried to crank - I can just see a broken tang on end of distribtor shaft or worse!! I am hoping to get some picture posted to show off progress - he's gotta run before I can show him off though.

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ZANE

08-29-2005 04:26:10

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Re: NAA - Rebuild - Oil Pump Stuck?? in reply to ReidS TN-NAA, 08-28-2005 19:50:39

You had better take that oil pump back off again.

Are you sure you were turning it the right way? Some distributors and oil pumps turn counter clock wise.

The gasket where the pick up tube connects is very important. If it is pulling in air it will never pull in oil no matter how the gakets fit or the gears fit.

It is also very important that all the old gasket material be removed from the mating surfaces on every gasket placement. Just a bit of old gasket material can cause a substantial leak with the new gasket.

How do I know this????? Don't ask!

Zane

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Rob

08-29-2005 03:25:49

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Re: NAA - Rebuild - Oil Pump Stuck?? in reply to ReidS TN-NAA, 08-28-2005 19:50:39

1. Cardboard is pretty far down on the list of stuff I might use for a gasket. Kraft paper maybe, but probably not cardboard. Did you measure that stuff at .001 to .002 or are you guessing?
2. Oil pump is too critical to mess around.

That said, I have never used cardboard to shim an oil pump but in answer to your question, no I do not think your homemade gasket is ok for awhile.

There is a gasket and it has only one small hole for the oil flow. EAA 6619-C.

Depending on how you made that gasket, you could be losing any oil pressure there. Not to mention that cardboard can come apart pretty easy.

I do not know about oil pressure but you should be able to see the oil flow if you remove the oil filter.

My advice, get your oil pump right.

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Dan

08-28-2005 20:22:01

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Re: NAA - Rebuild - Oil Pump Stuck?? in reply to ReidS TN-NAA, 08-28-2005 19:50:39

When I rebuilt my NAA engine, the Tisco oil pump gears were too thick and would bind solidly on the cover plate as well. I sent them back and lucked into a set of original NOS Ford oil pump gears off eBay and they fit perfectly. I think the Tisco gears are not measured correctly. Anyway - I primed my oil pump with assembly grease before I closed it up, this gave me a good prime to get oil pressure quickly after I started the tractor up. As long as you coated all the moving parts with assembly grease, you should be fine for a few seconds that it takes to build oil pressure.

Good luck,
Dan

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