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breather timing, sportster, sumping, xlch

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  #21  
Old 26th March 2021
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So, you had the vent line removed and the motor running?
I assumed you either had a leak there or clear hose for testing as you mentioned with the return.
If you simply took the vent line off, you opened an area in the cam chest that is reserved for oil separation.
Which will cause puking out the vent fitting on the motor.
Hook the line back up and that problem should go away.
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  #22  
Old 26th March 2021
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Default 1960 xlch

Sportsters are dry sump engines so there should be no oil flowing out the vent hose.With the hose removed there will be pulsing air due to the pistons up and down strokes and no oil flow as you described. The breather tube in the front of the gearcase should remove the air. If the gearcase is filling up or pressurizing oil and coming out the vent hose the breather/oil pump is suspect.The breather screen could be partially clogged since you mention some oil/mist out of the breather tube.
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  #23  
Old 26th March 2021
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Hi XL604,

This is probably a long shot question but it can't hurt to check. Do your 3 oil lines connect to the crankcase the same as the ones in this thread, post #1?

http://xlforum.net/forums/showthread.php?t=967253

Also, did you have this problem before the rebuild?
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  #24  
Old 27th March 2021
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Quote:
Originally Posted by XL 604 View Post
Mine is almost like another return so much oil comes out

thats your problem.


in a nutshell:
there are two oil pumps
a supply pump (skinny gears)
and a return pump (thick gears)


that means there is more volume gettin returned back into the oil tank than is being feed into the engine by the feed pump.


but you cant return more oil than was feed in.
so some of the return volume isnt oil, its air.


so the oil tank gets all the feed oil returned plus the excess air.
that would pressurize the oil tank if it wasnt for the vent line that returns excess air back to the cam cover where it equalizes with the atmosphere through the cam cover via puke tube.


for all this to happen the open end of the vent system inside the oil tank must be in the air space above the oil level in tank.

because you say the vent line is transferring oil not air back to the camcase it seems that your oiltank plumbing is faulty.
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  #25  
Old 29th March 2021
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Default 1960 xlch

After rereading all the comments I have the feeling the breather timing needs to be rechecked.The breather should start to open at 20-25 deg. atdc front cylinder. Verify this is happening.
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  #26  
Old 29th March 2021
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I think the engine is sumped, then more oil added, then for unknown reason the oil tank vent line was removed and found to be the return line, oil hoses are plumbed wrong. OP hasn't said anything about oil coming from the vent tube on the generator end of the gearcase.
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  #27  
Old 30th March 2021
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Sounds to me like lines were connected incorrectly after the rebuild/oil pump swap. Oil tank fittings identified: http://www.harleykmodel.com/technica...nks/index.html
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