When and why do you bleed HLA? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 04-30-2016, 10:09 PM Thread Starter
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When and why do you bleed HLA?

I am vaguely aware of the process. Why do it? Does it need to be done anytime top end work occurs and head is removed or cam\valves messed with?
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post #2 of 5 (permalink) Old 05-01-2016, 07:18 AM
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I am vaguely aware of the process. Why do it? Does it need to be done anytime top end work occurs and head is removed or cam\valves messed with?
Seems to me it may as well be done while the access is there. I am interested in what's up with this as well. Mine are probably the same as they were 30 years ago and i've only the foggiest idea what they actually do. I'm about to ( still waiting for organizational things ) tear mine apart as well. Trying to get as much info as possible before i even turn the head of a bolt.

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post #3 of 5 (permalink) Old 05-01-2016, 09:01 AM
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Good question!

Covered in 4-22 to 4-24 of the downloaded manual. Under index heading: "engine: top end"

I would say bleeding only needs done if the lifters have been removed and emptied of oil, or, the "leakdown measurement" procedure is being done to evaluate lifter condition.

If a removed head has been stored upside down or on it's side, the lifters may have emptied.

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post #4 of 5 (permalink) Old 05-01-2016, 11:42 AM Thread Starter
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When assembling a new engine wouldnt they start out dry?

Ok - I will review manual. So i am guessing the hla is the pieces with nipple of sorts under the rockers? If so i didnt remove them when i removed the heads. I even left rockers intact on one head. BUT i did tip them i want to skip if i can. I will crank w/o ignition a long time to pish oil and air out everywhere before starting.

I am not doing a total rebuild and didnt plan to check spec on all components given price and mileage (low) of project. Not knocking those that smartly do this.

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post #5 of 5 (permalink) Old 05-01-2016, 11:56 AM
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New (dry) lifters would usually get filled using roughly the same procedure as bleeding. Submerge in oil and pump the lifter plunger until no air bubbles are seen.

My opinion, you should be able to assemble your engine as is, the lifters should get topped off with oil fairly quick. If you have any doubt, just put the HLA in a bowl of oil and pump the lifter. If the lifter was empty, you should notice it getting stiffer to move.

Yes, the HLA is just under the rocker.

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