717 one of the small oil pump lines keeps cavitating

[Austin69]

Ive bled the oil lines with the bleeder screw and ran it with mixed but the rear oil pump 3/32 line is just mixed with air bad but the front line is full and working great! Please Let me know

 

[Austin69]

 

[Austin69]

 

[JJinSC]

Since you have premix fuel in, start the engine and while at idle, open the oil pump lever wide open for a few seconds and see if it will blow those air bubbles out. If not, it has to be drawing air somewhere. I would then take that line loose from the pump end and inspect line for cracks. Also, I have had one of those press-in fittings that the have the nipples the hose attaches on the actual oil pump get bumped while engine was being installed and actually fall out. Make sure that fitting is in and good and tight. If it is loose. You will need a new oil pump.

 

[JJinSC]

Actually the press-in fitting that I referred to was on the main line I believe. So you may want to check that fitting too. Though, if it was loose, it would seem like both small lines would have bubbles in it.

Check the line at nipples like I said and that fitting the is bolted to pump. Make sure washer is in good shape and that bolt is secured well.

 

[Austin69]

Actually the press-in fitting that I referred to was on the main line I believe. So you may want to check that fitting too. Though, if it was loose, it would seem like both small lines would have bubbles in it.

Check the line at nipples like I said and that fitting the is bolted to pump. Make sure washer is in good shape and that bolt is secured well.

Interesting! And what washer?

 

[JJinSC]

I’m not familiar with your model. I see why I was confused. Mine does have pressed fittings. Your model has the nipples bolted on. It would seem that bolt and fitting would need some sort of washer/seal to prevent leaking or drawing air.