New rebuild no oil pressure
#1
New rebuild no oil pressure
According to the manual I am supposed to loosen feed hose and idle until a couple ounces of oil comes out. Then it is primed. Problem is I am not sure I am loosening the right hose. I loosened the feed hose that is on the bottom going to the oil filter. Nothing is coming out. The oil pump is a year old.
Am I loosening the correct fitting? In this diagrahm I pulled #2
Am I loosening the correct fitting? In this diagrahm I pulled #2
#2
Can you prime the pump manually?
My engine builder told me to take the oil screen plug out of the top of my S&S oil pump and fill the pump manually from an oil can before starting the bike after the rebuild.....
But I also think you should loosen the line marked "1 Main Oil Feed" in the diagram above - the line from the oil tank to the oil pump - until you get oil there by gravity alone. That way you know the feed line is full and the pump is full. Then if you crank the motor with the plugs out, you should see oil coming from the pump to the filter.
My engine builder told me to take the oil screen plug out of the top of my S&S oil pump and fill the pump manually from an oil can before starting the bike after the rebuild.....
But I also think you should loosen the line marked "1 Main Oil Feed" in the diagram above - the line from the oil tank to the oil pump - until you get oil there by gravity alone. That way you know the feed line is full and the pump is full. Then if you crank the motor with the plugs out, you should see oil coming from the pump to the filter.
#3
on my '88 sporty. I filled the pump with oil when I put it back together. I pulled the plugs and cranked the engine until the oil light went out. Only took a few seconds.
After it was running I visually verified oil was returning to the tank.
Make sure the feed and suction lines to the pump from the tank are not reversed.
To answer your original question #2 appears to be the correct one to pull
After it was running I visually verified oil was returning to the tank.
Make sure the feed and suction lines to the pump from the tank are not reversed.
To answer your original question #2 appears to be the correct one to pull
Last edited by BMyers; 04-20-2017 at 09:16 AM. Reason: more info
#6
Yes, if you pull that line off the pump and there is no oil flowing, it's a pinched line or venting issue.
Last edited by ChickinOnaChain; 04-20-2017 at 09:46 AM.
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Wi_Duker (04-20-2017)
#7
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I'd pull the #1 line at the pump and make sure I had oil coming out there. If that's OK, put it back and pull the #2 line at the pump and see if oil comes out there. Maybe hook up a mighty-vac or similar and pull the oil through. Then crank it over without spark plugs a time or two, and you should have oil pouring out.
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#8
Oil line from tank to pump has a slow flow. Oil into tank is working fine. I'm draining the oil and it comes out a lot quicker than flowing into the pump. But then again it is a bigger line. Nothing is coming out of the pump to the oil filter.
.
So slow from tank to pump
good from pump to tank
nothing from pump to filter mount
.
So slow from tank to pump
good from pump to tank
nothing from pump to filter mount
#9
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mmmmmK. So, maybe there's an obstruction in the pump, or the pump isn't assembled right, or the pump isn't turning. I also had one once where there was a tiny air leak on the input side, and since oil is a lot thicker than air, it sucked in teh air and not the oil.
Take one of those shop oil cans that has a long skinny spout on top and a trigger pump on the side. Stick the spout into a piece of hose and connect that to the pump input. Pump away on the trigger. Should see oil come out the ->filter outlet. This will also prime the pump really well.
That good from pump to tank, is that while cranking over? If so, there's maybe something wrong with the relief bypass. either that or the pressureside of the pump isn't put together right, but the return side is.
One of those things I could probably sort out in about half an hour if I was there, butit's hard to describe over the net.
Take one of those shop oil cans that has a long skinny spout on top and a trigger pump on the side. Stick the spout into a piece of hose and connect that to the pump input. Pump away on the trigger. Should see oil come out the ->filter outlet. This will also prime the pump really well.
That good from pump to tank, is that while cranking over? If so, there's maybe something wrong with the relief bypass. either that or the pressureside of the pump isn't put together right, but the return side is.
One of those things I could probably sort out in about half an hour if I was there, butit's hard to describe over the net.
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Wi_Duker (04-20-2017)
#10
mmmmmK. So, maybe there's an obstruction in the pump, or the pump isn't assembled right, or the pump isn't turning. I also had one once where there was a tiny air leak on the input side, and since oil is a lot thicker than air, it sucked in teh air and not the oil.
Take one of those shop oil cans that has a long skinny spout on top and a trigger pump on the side. Stick the spout into a piece of hose and connect that to the pump input. Pump away on the trigger. Should see oil come out the ->filter outlet. This will also prime the pump really well.
That good from pump to tank, is that while cranking over? If so, there's maybe something wrong with the relief bypass. either that or the pressureside of the pump isn't put together right, but the return side is.
One of those things I could probably sort out in about half an hour if I was there, butit's hard to describe over the net.
Take one of those shop oil cans that has a long skinny spout on top and a trigger pump on the side. Stick the spout into a piece of hose and connect that to the pump input. Pump away on the trigger. Should see oil come out the ->filter outlet. This will also prime the pump really well.
That good from pump to tank, is that while cranking over? If so, there's maybe something wrong with the relief bypass. either that or the pressureside of the pump isn't put together right, but the return side is.
One of those things I could probably sort out in about half an hour if I was there, butit's hard to describe over the net.