51 8N Oil Pick up tube Alignment

BobMsc

New User
Due to a loose Oil pickup tube on a recently purchased 51 8n,I have begun the process of repair. However once I dropped the pan and inspected the situation there was not only not a screen at the pick up but the pickup wont come close to aligning with the drain plug hole. Is there a posibility that sometime in this tractors past a wrong tube was installed and not even attached securly to the pump? What should I do ? Help my 1st tractor.
 
Also I have had the pan on and off 4 times trying to align tube to drain hole so I can put new drain plug and screen in properly. Appears as if the tube is about 1/2 inch too long.
 
I am in the middle of replacing the oil pickup tube also. Luckily I have a good one from a parts tractor that threw a rod thru the block.
Here is a picture of a diagram I made using the good one, and some pictures of how I measured it. hope it helps, There may be other ways but I thought since I have one apart I would measure it best way I could.
a224011.jpg

a224012.jpg

a224013.jpg

a224016.jpg
 
TJ,

I asked this here before but didn't get an answer.

Is the pipe section inside the bell JOINTED up inside where that pipe meets the flat inside back of the bell and meets the pipe to the pump?

The reason I ask is that mine would wiggle when I changed the oil and put a finger on it.

I figure it must be like a rolled joint or something like that because my pressure is good, but maybe that connection at the bell is submerged in oil so it won't suck air from the sump.

Thanks,
Terry
 
Tall T, It looks to me like the small tube is one piece all the way to the pump and the cup maybe spot welded or swagged to the tube. My pressure was also good, 40
PSI on a cold engine at idle and 30 PSI with engine warmed up. Mine would wiggle back and forth (cup and the 1/2" tube together) When I got the oil pan off I could see
a crack where it is soldered to the pump plate.
Tom
 
(quoted from post at 05:27:38 04/17/16) Tall T, It looks to me like the small tube is one piece all the way to the pump and the cup maybe spot welded or swagged to the tube. My pressure was also good, 40
PSI on a cold engine at idle and 30 PSI with engine warmed up. Mine would wiggle back and forth (cup and the 1/2" tube together) When I got the oil pan off I could see
a crack where it is soldered to the pump plate.
Tom

Tom,

Perfect answer; thanks!

I guess I'd better drop the pan. What is puzzling, if I remember correctly, is that the cup was ridged, but the length of pipe inside wiggled. (?)

If the can had moved I would have dropped the pan right then.

Maybe the spot weld connection at the cup has left the main pipe still solid to the cup but the section inside the can, is broken and hanging by very little metal.

My oil pressure remains 40 or above in all conditions.

I've got the pan gasket so one of these days.

Cheers,
Terry
 
The oil pickup tube for the 8N after serial number 247571 is 3/16" shorter than the one for all engines before that serial number. Mixing them between models will result in the pickup tube being 3/16" off center in the drain hole one way or the other, depending on which combination you have. Pickup tubes for the truck and jeep engines were 1/2 to 1" longer than the tractor ones. You could have one of those. The pickup tubes are not a one size fits all deal, even though the aftermarket sellers of new ones say they are all the same.
 
The depth of knowledge on this site just amazes me.

I wonder how many others besides John in the whole have that info!
 
(quoted from post at 21:39:12 04/17/16)
I had the same thought now I will never look at my box of what is now assorted pick up tubes the same...
es, John does have a mental storehouse of information!
 
(quoted from post at 02:39:12 04/18/16)
I had the same thought now I will never look at my box of what is now assorted pick up tubes the same...

Hard to measure, but easy to tell the 9N6615 (9/16 pump gears) from the 8N6615 (3/4 gears) by looking at the mounting plate. 9N has ribs, 8N is smooth.

8n6615.jpg


.
 
Ordered new tube from YT. Installed and lines up correctly. Start tractor to hear loud knocking not heard before and no oil pressure. Following posts here that recommend priming through pressure valve. Some pressure like 5# and still knocking. Thoughts? SORRY FOR NOT BEING ABLE TO RESPOND PROMPTLY, WORK....Maybe crank or rod hitting tube...
 
After work on pickup tubes . . .
obviously the rule of thumb should be to rotate the crankshaft (get a friend to rotate with a front crank while you watch)
before putting the pan back on. If something is going to hit when it's running, then you'll find that spot in slo mo beforehand.

T
 
Bob,

Thanks for not taking my comment the wrong way. I said "obviously" but I wasn't meaning that you had missed the obvious.

This was the second time since my joining the forum, that a pickup tube wound up not being clear of the crank or rod caps, so i was thinking it was time to add a general safety precaution to the procedure, for myself as well. :)

Cheers,
Terry
 
OBVIOUSLY LOL. Dropped pan again today to reveal worn spot on pickup tube where rod journal was hitting.
 
Is the screen a necessary item and it just seems strange to me that the bell has no breather hole to allow the oil level to raise above the bottom of tube?
 
(quoted from post at 19:44:47 05/01/16) Is the screen a necessary item and it just seems strange to me that the bell has no breather hole to allow the oil level to raise above the bottom of tube?
ooks like someone once shared your concern & took matters into his own hands.
http://n*tractorc*lub.com/forums/nboard/messages9/193821.html
(copy & paste & remove the *)
 

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