Re-addressing the oil dipstick NAA

LeoinMI · Nov 5, 2012

After reading the previous post on the oil capacity of a NAA,(5qt or 6qt.) depending on the length of the dipstick,..I got to thinking,(Which can be dangerous for me). I assume if you have the 11.25 inch dipstick ,you must first start the tractor and let it run to get oil into the filter and THEN check the oil level to see if it is on the full mark. Checking the oil cold would result in an overfill on the stick of about 3/4qt since the filter takes an extra quart and drains back into the oilpan..
Am I way off on this or just complicating things? Just trying to clarify for future oil changes.

Dean · Nov 5, 2012

Yes. You must start the engine to allow the filter to fill and then allow the oil to drainback into the pan to achieve an accurate level check after an oil and filter change.

Cold (non oil change) level checks are accurate because most filders do not drain down upon shutdown due to check valves and/or air locks.

Dean

Geo-TH,In · Nov 5, 2012

LEO,
I have an NAA, Jubilee. The spin on filter will drain back only about a quarter of an inch on the dipstick after it sits for a long time. If my menory is correct, I only bought a 5 quart bottle of synthetic oil from Wal-mart. I have a splash left in the bottle because the spin on filter doesn't take a full quart. There was no need for me to buy extra oil, because my engine doesn't use oil. I went with synthetic oil because the filter drains back and takes 10-15 seconds after sitting to fill the filter and build oil pressure. I even use NAPA gold filter, still drains back. Removed filter to confirm it drains back.

If I remember, I'll measure the length of my dipstick tomorrow.

I would think if you put an extra quart of oil in engine, it might come out someplace.

I accidently overfilled a 13 hp honda engine and it smoked like crazy.

George

LeoinMI · Nov 6, 2012

I have the original style filter on my NAA George with a Wix cartridge filter inside the canister.(See attached Picture). I just assumed the original canister filter drained back somewhat due to it being on a 90 degree angle to the engine block. Thus causing a higher reading on the dipstick even when checked cold.

JMOR · Nov 6, 2012

(quoted from post at 12:31:05 11/06/12) I have the original style filter on my NAA George with a Wix cartridge filter inside the canister.(See attached Picture). I just assumed the original canister filter drained back somewhat due to it being on a 90 degree angle to the engine block. Thus causing a higher reading on the dipstick even when checked cold.

There was a diaphragm between block & filter with a hole positioned toward the top. This prevented drain back to the pump below the level of the hole. However, other than the tight clearance/oil film at bearings, there was nothing to prevent drain back through the center outlet of filter.....this should take a very long, nearly infinite period of time in a non-worn out engine & even then get you down to a half full filter. The FORD spin on adapter has a similar hole at the top. As for the anit-drain back flapper valve incorporated in spin on filters, in my observation those are not much of a valve! Some seem a little better than others, but I would not expect any of them, even 'original' Motorcraft to hold for much time.

Re-addressing the oil dipstick NAA

LeoinMI

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Dean

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Geo-TH,In

Well-known Member

LeoinMI

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JMOR

Well-known Member

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