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[Gettinold]

I would love to see some add'l. pics if you could let us know where we might find them.  This is all very disturbing to ole spyder.  Could cause me to start drinking again.  har. spyder

Remember Spyder, too much booze Will make you walk with a limp.

[spydglide]

Remember Spyder, too much booze Will make you walk with a limp.

Dagnabit!     spyder

[WVULTRA]

I would love to see some add'l. pics if you could let us know where we might find them.  This is all very disturbing to ole spyder.  Could cause me to start drinking again.  har. spyder

Posted in May 2009:

Ok here is what I found Vs a new one

The order that we found it installed which shows the spring below the piston when it should be above

The bike in question had never been opened up before, so it was assembled at the factory the wrong way.

 

[FR8TRN]

Did not know that, even shows it in the book like you say it should be.  So the pic at the start of the thread should be showing the spring if it's still there, or like you suggest it's under the piston where it shouldn't be.....interesting......Thanks...

[Twolanerider]

Did not know that, even shows it in the book like you say it should be.  So the pic at the start of the thread should be showing the spring if it's still there, or like you suggest it's under the piston where it shouldn't be.....interesting......Thanks...

The worn part pictured would almost certainly be missing the spring if it's above the piston.  Would have escaped through the worn shoe.  If the subassembly was misassembled and the spring was beneath the piston I'm not sure how that would play out in application.

If the piston is hollow you'd actually have much less shoe pressure and wear and likely a loose chain to the point of noticeably variable timing.

If the piston is solid it'd seem the shoe pressure would be the same as if the spring were on the other end.  But I'm not sure how the spring would stay captured.

[FR8TRN]

Agreed....it would be nice to see the inside of the piston...and the housing....but I can certainly see it being assebled different than designed as an issue.

[CVOJOE]

Hmmmm... so much for improvements. I'm glad I went gear drive.

 
Ride Safe,
Fired00d
 

AMEN!!! So much for the new and improved chit huh? 

[WVULTRA]

Piston is hollow with what apprears to be a small orifice at the top.  Have heard it's a one-way check valve.

If you ever get a chance to disassemble one, a quick review of the parts will help understand it's function.

 

[Twolanerider]

Piston is hollow with what apprears to be a small orifice at the top.  Have heard it's a one-way check valve.

If you ever get a chance to disassemble one, a quick review of the parts will help understand it's function.

 

Hollow piston explains how the spring is captured if its underneath rather than on top.  Much less tension from the tensioner system though.  Hard to believe there wasn't noise from chain slop.

[WVULTRA]

Hard to believe there wasn't noise from chain slop.

Agree.  And from the OP it appears to be the outside tensioner!

 

[porthole]

Not sure I am getting this. Are some saying the spring belongs between the piston and the shoe? That doesn't make sense.
What does make sense is the the spring under the piston keeps pressure on the shoe with no (start up) oil pressure or low pressure (hot idle). Once running the hydraulics should keep the proper tension.

Either way, I am thinking about pulling mine apart (SE upgrade) to inspect. Just can't get the crankcase pressure under control. Plan on pulling the pump to check the o-rings behind it.

I too am running a Fueling spring in the SE pump. Hot idle pressure is 30 and 45 or so the rest of the time.

[WVULTRA]

Duane:

I'm positive the spring goes on top of the plunger.  Have disassembled several new ones and they all are this way.  Will really shed some light on this once you have one apart in your hands.

My understanding is the spring keeps initial tension against the shoe.  Then a precise flow of oil enters the plunger while a check valve/orifice at the top of the plunger allows a very small amount of oil to escape which also aids in keeping the plunger lubricated inside the shoe.  There are three very small horizontal openings in that top section of the plunger that also serves as a seat for the spring.

Again, close inspection of a disassembled unit will yield a wealth of understanding/info.

 

[WVULTRA]

Maybe this pic will help............



Photo furnished by Herko!  THANKS!

 

[sadunbar]

http://www.harley-davidson.com/en_US/Media/downloads/Service/isheets/-J04804.pdf

see page 4 of the attached pdf...

[WVULTRA]

sadunbar: