Make sure the oil filter is free of any any bubbles first and then open the bleeder screw on the oil pump until oil flows out freely
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No oil
- Thread starter CoolHandJohnny
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CoolHandJohnny
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so I got a new to me oil pump. I bled the supply hose and the filter as much as I could. Maybe just a very small air bubble in the filter. I’ve been squirting oil in the cylinders before cranking on the hose. Once cranked and water flowing, I’ve been turning the pump full open. It is pumping quick but is pulling air from somewhere. I’ve tightened the hoses as much as I can so am not sure where this air is coming from. I finally got oil in most of the small line on the left. The one on the right is pushing some oil but only a little. Ive done this cycle 7 times now and the right line isn’t getting any better. Any ideas guys? Shouldn’t both lines be full of oil? It did start smoking once the left line got completely full of oil.
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I’m not sure why that line would not fill with oil but better hold off on cranking it till it can be figured out. Which lines are you speaking of when you say you have tightened the lines as much as you can? If it’s the small oil lines, they fit so tight on the nipples tha to they are a real bugger to get on. The only other thing I’ve read was the check valves but I don’t know anything about them. Sorry, hopefully someone comes on that can help.
CoolHandJohnny
Member
Yea, the small oil lines are the ones I was talking about.
Did they seam kind of loose? Maybe the wrong size? Your engine is a 787? They should be 3/32”
CoolHandJohnny
Member
No, not loose at all.
CoolHandJohnny
Member
Can anyone else help me out? Should both lines have oil in them? If so, any idea why I would be getting air in the one line and not the other? If noone has a better idea, I'm going to change out this oil line tonight. Fill it with oil before cranking and see what happens.
Ground your spark plug boots and while cranking hold the oil pump wide open. Should see the oil fill the lines
CoolHandJohnny
Member
So don't actually crank it? I just ground the boots and turn it over with the pump held open? Any idea why the one line wouldn't be filling up like the other one? Also, fluid seems to go through it a lot faster than the line that is now full of oil.
No, you have to have the engine turning over for the oil pump to work and if it isn't with the engine actually running at 3,000 rpm it isn't going to just cranking at a few hundred.
Yes, both oil lines have to be full and pumping, one is for each cylinder.
If one isn't pumping, make sure the nipple on the intake manifold isn't plugged on the one that isn't pumping.
Yes, both oil lines have to be full and pumping, one is for each cylinder.
If one isn't pumping, make sure the nipple on the intake manifold isn't plugged on the one that isn't pumping.
CoolHandJohnny
Member
It is pumping but it's like it isn't picking up much oil or is getting air in that line. I can see oil being pushed through the line very quickly but only a very small amount at a time. It's mostly pushing air through that line.
CoolHandJohnny
Member
Okay. I guess it just seems strange to me that only one side seems to be getting air in it while the other one filled up with oil. Thanks for the help.
CoolHandJohnny
Member
I'll certainly try it.
Thanks again!!
I was trying to find a solution for this last night and couldn’t get a definitive answer by looking through old threads. Where are the check valves on these 787 RFI’s? are they in the oil pump? I’m guessing they allow oil to go through the pump into to the small oil lines and then close so as not to allow it to back flow? Could it be possible that the one check valve is clogged or broken and not opening? I think I read it takes 3 pounds to open the check valve, not sure about that though.
CoolHandJohnny
Member
SMH. So I bled the pump again…twice. Replaced the hose that wasn’t getting oil through it. Had to run it 4 times but it finally got oil all the way through it to the cylinder. It no more than filled up when the other line stopped pumping oil. So now the one that was full is empty and the one that was empty is full. What gives?
Could this be the check valve?
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CoolHandJohnny
Member
I’m now wondering if you’re onto something here. I wonder if the check valve isn’t opening as much as it should. When one tubes pressure gets higher than the other tube, it starves the other tube so it can’t get enough oil. The check valve is only opening enough to supply one side. There appears to only be one check valve and it is above the oil tank.
I was asking, I don’t have a good grasp on the check valve thing at all. From my reading I thought there was one in the oil pump but couldn’t find any good information to confirm that.
This it? Doesn’t matter now anyways since the oil has switched sides as to which line is filling up
Those are for the 720-580 engines and mount to the oil pump.
CoolHandJohnny
Member
Any ideas on what could be causing this issue?
Since your not getting any replies right now, just to recap. You got a new to me oil pump, did you bench test it with a drill at 1500 rpm in reverse? I can’t remember how much it’s supposed to output at, but it can easily be looked up in the manual. If it passed then I would think the only place to look would be the nipples where the small oil lines attach. If it didn’t pass then get another new pump. Highly irregular for these pumps to go bad. When your trying to fill the lines ( only try to fill the lines if the pump passes the bench test ) are you actually starting the machine? Add some oil in the plug holes, start the machine, then reach down and hold the oil pump wide open. If the pump passes the bench test it should fill those lines up in seconds idling with the oil pump lever held wide open. Don’t run the machine more than 20 seconds. No need for the water hose.
CoolHandJohnny
Member
I tried the bench test but wasn’t sure I was doing it right as I never got oil to pump on the old one or the new to me one. I am starting the machine. I have been putting oil in each spark plug hole prior to starting. I have been putting it on the water hose too. I have been running longer than 20 seconds but been keeping it around a minute or less.
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