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no oil flow rear rocker

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  #1  
Old 24th October 2021
Hardtail28 Hardtail28 is offline
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Sportster/Buell Model: Sportster 1000xlh
Sportster/Buell Year: 1979
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Lightbulb still not a drop!!! 1979 1000xlh

Hello again!, I posted a few days ago looking for some knowledge from the community but, have not had any replies..? i will post again. I have a 1979 1000xlh sportster (the year with a gearoter/scavenger oil circulator (pump). goin' over some maintenance, I disconnected my oil lines that join the split-rocker covers, there are 2 covers for each cylinder head, totaling four covers in all. i noticed that only the front rocker was receiving oil. compress aired all the lines... i feel a small bit of air coming where the oil SHOULD be flowing. started the bike and have good oil flow directly coming from crankcase (where oil line to the rocker would go (disconnected currently). reconnected the lines and still no oil, not a drop coming from the rear rocker disconnect. i ran for about 3-5 min. in all. i don't have any idea at this point, what it could be. is there not enough pressure? why is it only affecting the rear and not the front? PLEASE, if you come across this post and have any ideas... i would greatly appreciate any help out there, thank you
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  #2  
Old 24th October 2021
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Start from the source.
What's your oil pressure from the pump?
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  #3  
Old 24th October 2021
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I was thinking this would get more attention in the Ironhead 57-85 section. Maybe the Mods can move it.
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  #4  
Old 24th October 2021
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I didn't noticed that but you're right.

I'll post this anyway.
Normally it should be a straight shot front to back before splitting the boxes.
(front box shown)

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  #5  
Old 24th October 2021
Hardtail28 Hardtail28 is offline
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There is extremely minimal pressure readings for the 79*s, they operate at about 5 or 6 pounds pressure... I didn't get a pump pressure as it was flowing well from the spot where you would connect your oil line to the cranckase. I figured that, once I connected the lines again, it would be flowing for sure. Is there something (mechanically) that could cause low pressure in the rear but not in the front?, ie tight rocker, lifter?
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Old 24th October 2021
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Mechanically speaking, if the oil is all going out the end of the front rocker arm instead of backing up to flow to the rear, then that could be a problem.
I'll send IronMick a message to see if we can move this thread to the IH section.
Maybe more help there.
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  #7  
Old 24th October 2021
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Moving to the Ironhead section.
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  #8  
Old 24th October 2021
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If you say you are running split rockers, we need to see your plumbing. If you have oil coming from the two port near the tappet blocks, your issue lies somewhere above, which we don’t know what you have to begin with. There are a few ways to plumb that set up. Take a pic and post it.
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Old 25th October 2021
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I'm going to assume that your saying the rear rocker box is not getting oil ?

Or are you saying the rear box on your divorced rocker box on the front head is not getting oil ?

First check in any case is to remove the set screws in the front of the rocker box. With the engine running oil will leak from there.
If there is no oil you have a problem that needs to be fixed.

This checks both the exhaust and intake sides of the front rocker box but on the rear only tells you it's getting to the intake side.

If you have divorced rocker boxes and you have oil at the intake on the rear cylinder you can disconnect the line between the rocker halves and check for oil.

You may have to pull the arms and clean the annular groove and check the holes in the shafts themselves,
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  #10  
Old 4 Weeks Ago
Hardtail28 Hardtail28 is offline
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Alright so update, first... thank you all very much for your replies.in regards to ferrous head's reply, I am actually saying that the entire set of split rockers (the whole rear, intake and exhaust) was not getting oil. Hopefully, this will help someone? I had tried blowing w/compressed air, proding/poking, etc. Oil was coming from the crankcase, hooked up the 10" oil line from the crankcase to rocker, oil all the way up. Connected again to the rocker, no oil? I could feel compressed air where the oil should be but nothing. Even rode it a few blocks! The ONLY thing that worked... started it with the slit-line coupler off (brass piece on the rocker shaft) and popped 3 shots of 10-15lbs. Compressed air in there. Immediately started flowing.ohh!, that beautiful stuff.
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