4 1/2 qt's "Easy to explain" ??? Please do,,

G

Greg way out West

Member


Hi Guy's,,



Mr. Roger's said is was simple physic about the 4 1/2 vs 5 qt Refill on the oil "leak" question.. When he get's time to explain why the 5 qt. leak deal I'am all ear's...


Maybe Ford made a mistake on the refill amount ???. Maybe "old" Henry wanted it to leak and lube the wishbone socket ???


Greg out west,


 
OK Greg, here is how I see it. With the oil at the 5 quart mark and no more the pan will have about 4 quarts in it when the engine is running. As the oil is pulled out of the engine pan it is replaced by oil returning from above via the mains and the hole in the front of the valve chamber and the down tube. The most important return is the main return tube because it has a small amount of suction on it to keep the main channel from flooding because of the removal of oil by the pump. As implausible as this sounds the pump creates a circulation . If the oil is too full the suction is too little to keep the channel low so the oil overflows the channel at the rear main. In other words, if the oil is not kept at the recommended level it will leak. This only happens at overfull. I try to keep my oil at about 1/2 quart low. This is plenty to keep lubrication good but insures I don't over fill the rear channel and have a leak.

The turkey is gone and I feel better. Sunday it starts all over again :(.
 
Correct me if I'm wrong, but when you drain the oil is their not some (1/2 qt?) left in the dipper(windage) tray? And that is the reason for only adding 4 1/2 qts when refilling.
Paul in CT
 
1931 flamingo said:
Correct me if I'm wrong, but when you drain the oil is their not some (1/2 qt?) left in the dipper(windage) tray? And that is the reason for only adding 4 1/2 qts when refilling.
Paul in CT
Click to expand...

Right, and when I change oil I use 4 quarts only and the oil level is half way between FULL & LOW, which is just fine. By the time the oil is down to the add line, it's time to change again. Works for me. :)
 
James, et al:

If the oil level is 1/2 qt too high, say 5 qts, does it leak at the rear main only when the engine is running, or will it also do so when the vehicle is not running, parked on level ground, say you add five quarts at oil change, then walk away from it w/o starting it and leave it sit overnight ?

Kind of a silly question, but I'm curious...
 
Special Coupe Frank said:
James, et al:

If the oil level is 1/2 qt too high, say 5 qts, does it leak at the rear main only when the engine is running, or will it also do so when the vehicle is not running, parked on level ground, say you add five quarts at oil change, then walk away from it w/o starting it and leave it sit overnight ?

Kind of a silly question, but I'm curious...
Click to expand...
Once it is run. Filling the pan even 7 quarts and not running it will only make the pan too full and basically a storage area. Now, run it and you will have a leak. The oil has to be circulated and the suction from that circulation defeated by adding too much oil. Raise the front of the car or motor (a hill or jack) shortly after running and you will have a leak. Just adding too much oil and walking away means you have a large expensive oil can (pan). This was evident when the motors were new in the AA trucks used for grain hauling. When the front of the trucks were lifted to dump the grain, oil leaked profusely so, Ford added a drain tube that had a check ball in it so the oil couldn't run up the tube or the heightened level in the pan would create pressure in the tube forcing oil out the rear main tube channel.
 
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