Is there any help for a stuck HLA?? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 21 (permalink) Old 05-05-2011, 05:11 PM Thread Starter
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Is there any help for a stuck HLA??

I have an HLA that is clattering in my engine. It was really bad yesterday. I had my bike running, and at idle it was pretty loud and it was clattering intermittenly.
I recently changed my oil, and I put in Castrol 20W50, and it's still in the lower 50 degree range outside.
Could the oil be a little too heavy for the cooler weather?
Could it have an affect on the HLA's?
I checked both ACCT's and they are both working good. The noise don't start till around 2,000 RPM's and usually after it's warmed up a bit.
I added some Seafoam to the oil last night and went for a short ride to see if it helped any.
Is there anything I can do to help free it up? I might have to do another engine pull and look at them.
The noise is coming from the front cylinder, but the weird thing is that under acceleration it goes away, it seems to make the most noise under cruising conditions ie: with no load on the engine.
Any ideas from the brilliant mechanics out there? Thanks all.
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post #2 of 21 (permalink) Old 05-05-2011, 08:46 PM
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How did you check the ACCT's, you still could have a very weak spring or a busted one? Did you take them out and check the front one. You have a large cap just above the ACCT, remove, there is a spring in there that also puts tention on the upper chains. See if it is broken this could also give you a loud chain slap.
You said that you had the engine out, what was done after it was removed?

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post #3 of 21 (permalink) Old 05-05-2011, 10:24 PM
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HLA ???? Advise the dummy please.


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post #4 of 21 (permalink) Old 05-05-2011, 10:27 PM
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What he is saying I think is Hydrolic, lifter, assembly. that is what I come up with.

2004 25,500 miles
Led tail light enhancement
Homemade floor boards
Headlight modulator
Extra heat sink on R+R
R+R relocation
Homemade driver's backrest
Fused Stator
Mcct conversion-cost 4.50
Ride-on in tires
crash bar with home made hyway pegs
iridium plugs
home made fork wind deflectors
coil pickups adjusted.
Kenda kruz tires 110/90 170/80
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post #5 of 21 (permalink) Old 05-05-2011, 10:33 PM
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when my acct spring broke I was 40 miles from home, at idle and low cruising speeds it was clacking like hell, if I kept the rpm's up it was fine so I revved it the whole way home, put in a new spring and it was gone. for less than 6 bucks and a quick trip to the hardware store and 10 minutes you can convert it like I did in my signature line and see if it fixes it, you can always switch it back to an acct later if you want but shouldnt need to. I would try that first!

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post #6 of 21 (permalink) Old 05-06-2011, 04:55 AM Thread Starter
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HLA is the Hydraulic Lash Adjuster under the rocker arms that keeps the rocker arms in contact with the camshaft lobes.
I manually checked both ACCT's with a screwdriver with the engine running. I turned them CCW slowly until the chain started rattling, then released the screwdriver, and the chain noise went away. I then turned the screws slightly CW to make sure there was sufficient tension on the chains.
I checked both springs under the caps above the tensioners, and both were good with tension on them.
I checked the timing chain tension when I had the engine out and both chains were tight.
I am almost positive the noise is coming from a lash adjuster as the noise is intermittent.
At idle the engine makes absolutely no noise at all. You rev it up to 1,000 RPM's, and still no noise. It don't make any noise until roughly 1,800 RPM's and the noise is the worse at cruising speed.
I will check the springs under the caps again, and I am going to go get some flat washers to put between the caps and the springs to see if that helps any.
I had the engine out to do some carb work, and to replace all of the O-Rings and water & fuel lines.
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post #7 of 21 (permalink) Old 05-06-2011, 11:45 AM
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When I checked the spring behind the large caps they measured at a little over 1 and 1/2in long. Right for wrong I stretch them to about 2 inches long, because I was having a little noise in the top end. They do not seem to be made of hard tempered steel.

2004 25,500 miles
Led tail light enhancement
Homemade floor boards
Headlight modulator
Extra heat sink on R+R
R+R relocation
Homemade driver's backrest
Fused Stator
Mcct conversion-cost 4.50
Ride-on in tires
crash bar with home made hyway pegs
iridium plugs
home made fork wind deflectors
coil pickups adjusted.
Kenda kruz tires 110/90 170/80
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post #8 of 21 (permalink) Old 05-06-2011, 04:18 PM Thread Starter
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I'm going to take the springs with me today, and get some new ones that are a little longer with a little more tension, and see if that helps any, and will post the results.
I'm hoping that I can get a sound recording at various RPM's so that everyone can hear what I'm hearing in the engine.
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post #9 of 21 (permalink) Old 05-07-2011, 02:59 AM Thread Starter
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I added 2 flat washers behind the springs tonight, and they had no affect on the noise at all. I checked the ACCT's again, and they are both tight.
If I tighten them much past snug, it will actually pull the engine down, and I can hear the chains against the guides.
I changed the oil and it didn't help either.
The noise is coming from the front cylinder.
So I guess it's time to pull the engine AGAIN.
Anyone want to buy a parts bike?
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post #10 of 21 (permalink) Old 05-07-2011, 10:05 AM
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Quote:
Originally Posted by RakerBill View Post
I added 2 flat washers behind the springs tonight, and they had no affect on the noise at all. I checked the ACCT's again, and they are both tight.
If I tighten them much past snug, it will actually pull the engine down, and I can hear the chains against the guides.
I changed the oil and it didn't help either.
The noise is coming from the front cylinder.
So I guess it's time to pull the engine AGAIN.
Anyone want to buy a parts bike?
try some Lucas OIl treatment,before you pull the engine,it may help,the sound you describe sounds like a collapsed lifter,or it may be stuck in it's bore,but usually they are noisiest at idle ,when oil pressure is lowest.

I have personally used Lucas,oil treatment with good results,you will have to drain some of your oil and add the additive,then run your engine until it runs N.O.T. and then try letting it have time to pump up the bad HLA ,if the noise doesn't go away then pull the engine.

I am in no way affiliated with Lucas Additives I am just convinced through my own experiences they make good stuff,It's worth a try.




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