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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 22nd April 2020
XLXLXL XLXLXL is offline
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Question IH 73, oil not returning, need trick to pull out oil pump out

Hey folks,

I have just rebuilt my 73 IH, the oil pump was working fine, in the beginning, it flows back to the tank, rode 20-30 miles, then it started to decrease, last time was no oil at all, even if revved to 2000-3000, still nothing.

so far:
1. i have checked the lines, all no clogged nor pinched
2. opened the ball valve side, cleaned, few really small debris
3. opened the camgear covers and blow oil line/holes, all through
4. put off the oil pipe to topend and blew it, all seems through as well.

last position; No oil in to the tank and no oil out from the tank. I came to the conclusion that the oil pump failed!? Or just simply I need to bleed the system? what could possible broken inside? bushing?

I need trick to pull the oil pump out without taking off the engine off the frame, some dude lean the bike one the left/right side will dismounting the engine mount!? can I do this?

Any better practices?

many thanks
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  #2  
Old 23rd April 2020
72 Ironhead XLH's Avatar
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Unless your frame has the offset, motors got to come out
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Old 23rd April 2020
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Quote:
Originally Posted by 72 Ironhead XLH View Post
Unless your frame has the offset, motors got to come out
thx, yeah. digging a lot, that will be inevitable.

UPDATE: I bled the oil pump / or prime the pump, it worked well.

just did: start the engine, open the ball valve side, let the air and oil out for 30 secs, plug immediately, then you are good.

case closed.
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Old 23rd April 2020
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Good!!!! sometimes the simplest things get overlooked!

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Old 23rd April 2020
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I'd keep a good eye on that, I've never known a pump work for 20 miles and then need bleeding, it suggests that something is amiss.
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Old 23rd April 2020
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Quote:
Originally Posted by yoshi View Post
I'd keep a good eye on that, I've never known a pump work for 20 miles and then need bleeding, it suggests that something is amiss.
my bad, I reroute the lines earlier the day, invited air through the system.
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Old 23rd April 2020
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Pull off the feed line at the pump and bleed the air before starting.
Or let it set overnight. (this won't work unless your feed line is up hill all the way to the tank)
Another trick is you can prime the pump/motor by back feeding oil into a rocker feed line.
Also you can pull the tach drive and pour a half quart into the motor to keep it from starting up (or running) dry. It's mostly splash lubed....

A ball valve is a ticket to disaster, you will know when you forget it because your wallet will break out in a cold sweat.
Ride it regularly or put a pan under it. It's part of the Mystique or Adventure of owning a vintage bike.
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Old 24th April 2020
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Quote:
Originally Posted by ryder rick View Post
Pull off the feed line at the pump and bleed the air before starting.
Or let it set overnight. (this won't work unless your feed line is up hill all the way to the tank)
Another trick is you can prime the pump/motor by back feeding oil into a rocker feed line.
Also you can pull the tach drive and pour a half quart into the motor to keep it from starting up (or running) dry. It's mostly splash lubed....

A ball valve is a ticket to disaster, you will know when you forget it because your wallet will break out in a cold sweat.
Ride it regularly or put a pan under it. It's part of the Mystique or Adventure of owning a vintage bike.
thx for the advises.

finally, did plug off the oil switch, and start the engine with pan set below. run engine on idle 30secs, and close immediately. Not a clean job with all the oil spits, but it worked well.
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Old 24th April 2020
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Check valve! Ball valve is something else - plumbing stuff.
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engine mounts removed, the engine can tilt enough to clear the pump without pulling engine but if you do, now's the time to mod the frame. there are several ways and many here have done so, self included.
there are a couple of other things that can be done but NOT for the faint of heart.
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