N15 Oil issue

Hi all,

68 N15CS. Been having an issue with oil coming out of the breather/smoke coming from exhaust intermittently. Rode for over an hour today and started again just as I was getting home. Looking in the oil tank this is the first time I noticed no oil returning to the tank. Before the ride I had plenty of flow including air bubbles.

Took off the timing cover and oil pump. Was able to blow air through to the oil tank and the pickup hole on the sump no problem. Oil pump spins and gurgles and seems to be fine. Taking it apart shows the plate is smooth and nothing looks worn. I'm at a loss. How can the pump have an intermittent problem scavenging? Any ideas?

Thanks,
Matt

I think you need to measure your oil pressure to get a good handle on what your oil pump is doing.Try a tee fitting off the rocker lube line.

You have a scary situation going on!

Slick

You may have blown the obstruction back into the engine. Drain the case ,look for crap. Remove head feed ,run motor,oil should spray out showing supply ok, but still may have scavenge problem, lump of silicon ??.

Rubber pipes can delaminate internally providing an unwanted check valve that works intermittently.

Look on the bright side,your motor got too much oil, better than none.

Thanks guys. I think I'll start by replacing the oil lines to and from the tank. I'll add in an oil pressure gauge there.

AZMatt said:

Thanks guys. I think I'll start by replacing the oil lines to and from the tank. I'll add in an oil pressure gauge there.

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The oil lines to and from the tank are not pressure lines. An oil pressure gauge should go in the rocker box feed line.

While you are replacing the oil line to and from the tank, remove the feed line hose barb from the oil tank. If it is anything like the Atlas, it should screw out, bringing with it the internal oil screen. A clogged oil screen could cause your symptoms.

Slick