1950 8n conplete engine rebuild only have 10# psi

[Fritz Maurer]

May be missing this part in filter

 

[DanielW]

I could be misremembering (one of the experts will correct me if I err), but I believe all the N's right up through the alter production 8N used an orifice restriction into the filter. The filter is at the 'end of the line' for oil routing, so what doesn't go through the bearings makes its way to the filter. Sounds like yours isn't being restricted like it should be at the filter, but because the filter is the most down-stream component of the oil routing, it's probably not overly concerning. There was some debate on here a while ago about exactly how/what the orifice restriction into the filter was: Some said it was in the fitting, other say it was a small hole in the can. Whatever the case, sounds like yours is a little too open. It's probably not overly concerning because the bearings are getting oil, but a little more pressure at the bearings certainly wouldn't be a bad thing.

 

[tim haire]

I got that but i plugged filter guvernor line at the housing so no oil could pass through and i had 10 psi

 

[lha]

The oil pump in the early 1950 tractor have a thinner gear size than tractors with a S/N after 247571. In the early tractors there is less volume flow rate and lower oil pressures than with the later model 8Ns. (Expected)

The correct oil gauge for front mount distributor is 9N 9273A which is 0-50psi gauge. The 0-80 psi gauges used in later model 8Ns are not as accurate with the lower pressures, and may not read correct.

You may want to vent the line at the gauge as well.

That's strange that my '41 9n gas 40# cold and about 20# hot. Bearing clearances,spring tension on relief valve have a lot to do with oil pressure. I don't want to start an "oil battle",but I use 15W40.

 

[DanielW]

This might be a long-shot suggestion, but how long did you run it for when you blocked the governor line? If some of the oil drained from the filter can when you took off and blocked the line at the governor, it would a few minutes to fill the filter cavity, displace the air, and start pressurizing it. Similar to if you don't pre-fill the filter cavity on a tractor with a cannister type of filter: It takes a little longer for the oil pressure to build up. Think of it like the bladder tank for a well system in your house: You can tell when your bladder's gone and the tank is completely full of water, because it'll pressurize instantly (what you want, in the case of your oil filter). When your well tank is working properly with an air cavity above the bladder it takes longer to build pressure.

Maybe try running it for at least 5-10 minutes or so with the governor line blocked and see if it changes?

 

[soaked]

I believe the pickup tube solder joint can break, causing variable suction results. Also may need priming, then other start ups it doesnt.The screen on the drain plug, if intact, can "hold" it, and keep it from falling out. Need to drain the oil and put fingers on it to tell if its loose.

This pickup tube fell out as I dropped the jack.

 

[Duner Wi]

Be sure to post the end of the story please.

 

[tim haire]

This might be a long-shot suggestion, but how long did you run it for when you blocked the governor line? If some of the oil drained from the filter can when you took off and blocked the line at the governor, it would a few minutes to fill the filter cavity, displace the air, and start pressurizing it. Similar to if you don't pre-fill the filter cavity on a tractor with a cannister type of filter: It takes a little longer for the oil pressure to build up. Think of it like the bladder tank for a well system in your house: You can tell when your bladder's gone and the tank is completely full of water, because it'll pressurize instantly (what you want, in the case of your oil filter). When your well tank is working properly with an air cavity above the bladder it takes longer to build pressure.

Maybe try running it for at least 5-10 minutes or so with the governor line blocked and see if it changes?

I got thinking the same thought so instead i plugged the t going to cartridge bingo 25psi. the canaster has been replaced by a new aftermarket one the brass fitting was not a restrictive one. I ordered a restrictive one lets see what happens ill let you know !

 

[tim haire]

I believe the pickup tube solder joint can break, causing variable suction results. Also may need priming, then other start ups it doesnt.The screen on the drain plug, if intact, can "hold" it, and keep it from falling out. Need to drain the oil and put fingers on it to tell if its loose.
View attachment 79474
This pickup tube fell out as I dropped the jack.

yes they can i used smoke machine also vacuum pulled -30psi its all good

 

[tim haire]

Be sure to post the end of the story please.

I will i hopeing i found problem .

 

[tim haire]

Be sure to post the end of the story please.

ok after blocking off t and having good 25psi i ordered restriction fitting installed ran 10 min ran out of gas . put fuel in tank started walked away put gas can away came back 0 oil pressure i Quit this will have to weight till fall!!!

 

[JMOR]

" the canaster has been replaced by a new aftermarket one". As Dunner said, the restriction (as Ford built it) is in the filter canister. So, when you replaced the canister, you removed the restriction.

https://imgur.com/JwI3DoT

https://imgur.com/7hQ1H3V

hole" It is just a tad under 1/16, (#53 drill size, 0.059 inch) (vs 1/16=0.0625 inch)

 

[tim haire]

i will find a stock replacement. But now with filter line plugged only line to guage i lost all pressure have feeling junk turkey made oil pump must have took a crap brass fitting did not fit housing to thick to press in machine shop got the correct one. Probley drive gear came loose from shaft !Just guessing

 

[Dan]

i will find a stock replacement. But now with filter line plugged only line to guage i lost all pressure have feeling junk turkey made oil pump must have took a crap brass fitting did not fit housing to thick to press in machine shop got the correct one. Probley drive gear came loose from shaft !Just guessing

Pretty sure the gear didn't come loose from the oil pump shaft - the shaft has a flat that the gear has to fit into - I can't imagine any way that could slip unless the new gear hole was completely round and didn't have a matching flat cut in in (not likely). With the oil line removed from the oil guage do you see any oil coming out of the line?

 

[tim haire]

Pretty sure the gear didn't come loose from the oil pump shaft - the shaft has a flat that the gear has to fit into - I can't imagine any way that could slip unless the new gear hole was completely round and didn't have a matching flat cut in in (not likely). With the oil line removed from the oil guage do you see any oil coming out of the line?

thats tomorrow have other project's today

 

[HCooke]

As I posted above, there has been a lot of discussion on this forum re oil pump gears. Please look at this discussion and share it with whoever rebuilt your oil pump.

1950 8N - Oil Pump Replacement/Rebuild

Hey everyone, I've got my hand on an 8n for the first time. Tore into it last week to find out what damage had occured when previous owner put the governor bolt in the wrong hole. In addition to the cam and crank gears being trashed, I also noticed a lot of play in the pump shaft. When I...

forums.yesterdaystractors.com

 

[olddavid]

Withdrawn.

 

[tim haire]

For all thats been following this is what happened. Removed pump made in turkey gears worn after 5 min run time also main shaft pulling out of pump gear. everthing pressed together at machine shop and assy lube on gears. So i had shop reinstall old gears as they were within specs installed . Found a original filter housing installed with ford restrictor that Fritz suggested fired up 80psi woops took out restrictor 40 psi! thanks all that chimed in ! ps the machinest and i think drive gear may not had the correct pitch pulling itself apart.

 

[DanielW]

Thanks for reporting back - always nice to hear the end result.

40 psi - wowzers. Almost 10X what I have on mine when its warm. Guess I should be looking into it this winter.

 

[ole fred]

I'll bet your oil filter wasn't full.

Opps, I guess I didn't get current before I posted.