Don't overlook the filter cover as there are a whole lot of them that don't fit real good and some also get egg shaped after while. If you smear a good layer of grease all around the contact point of that round cover, it will suck the grease in any spot that is leaking. I have known guys to put a back up washer( rubber band) so to speak, in the groove so O ring protrudes more for a seal.
As for that o ring between the split, it should not affect rear pump until the front pump quits supplying oil entirely, then it could possibly draw air back wards through that passage because the o ring in question is well forward of the rear pump and front pump is still trying to pull oil forward.
I used to put a bead of 515 loctite around the outside of that o-ring in the split as insurance to prevent leakage. There really is not tube as it is merely a spacer that sits in a recess to keep o-ring from collapsing.
You have a seal pressed into the rear housing on the rear pump suction tube behind the filter that can cause you problems as well , even though it is below oil level , the oil is churning right close to that seal due to the gear driving the pump gear.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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