U Oil Issue

molinegb

Well-known Member
Just started up a U and no oil to front rockers. Fished pipe out and no apparent blockage. Have oil in port beside that feeds distributor. Where is oil fed from?
 
Gas engine? Diesel may be different.

I am guessing its a later split-block gas/lp engine, cylinders in pairs.

I am thinking oil comes up the tube through the passage in the head and block from a drilled passage/gallery that runs from front to rear in the crankcase and I am guessing it is supplied to that passage from the filter housing, or at least it gets its oil from that area behind the filter housing.

My very first U with KEF engine had an external copper tube (added I presume) that was tapped into the side of the crankcase at that oil gallery and ran externally through some sort of valve and up the side of the engine to the head, where it went through a drilled hole in the side of the head and from there inside the valve cover to the front of the rocker shaft. I am guessing someone thought it was getting too much oil to the rockers and wanted to cut the flow back some with that valve. Since there was no provision to seal the tube where it went into the head, it always oozed oil where the tube went into the head.

Also, MM used a 1/4 or 5/16 dia. rod about 2-1/2 long in some of those vertical oil tubes to limit how much oil could get up there to the rockers.
 
All gas U's KEC KEF and 283A have same oiling system. One external pipe that feeds distributor or magneto drive and waterpump setup. Two feed tubes on heads. One on front and other on back. Same setup used on the diesels. Front of cam is fed by crankshaft then out to distributor drive. I have oil there and I can run wire through hole in cam down to crankshaft. Rocker feed is only an inch away and it has no oil.
 
I don't know what the rocker-arm end of the oil feed looks like in detail, but would it be possible to connect oil or air under pressure to it, to try to blow out any obstruction (backwards direction)?
 
UTS does not have camshaft bearings. Thinking there must be another hole in front throw of camshaft. Back further to feed front head. May have to pull out another cam from parts one.
 

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