7500 mile service

[HOOLIGAN]

As some of you may have read on my previous post i was having some whining noise on decel. I have that taken care of as of now. Anyway here is my question: While looking through my owners manual i came upon a checklist for the 7500 mile service (which the dealership wants $200 to perform). I realized that over the past couple weeks i had performed all but 2 on that list. The first being "check compensator sprocket for backlash" and the second being "download ignition module, note settings and rev hits, forward to Big Dog Customer Service".
How do you check the backlash? and is the download being forwarded to Big Dog important?

 

[Gas Man]

Fuck the download
I thought you checked your compensator nut?

 

[HOOLIGAN]

Fuck the download
I thought you checked your compensator nut?

I did check it for tightness. It's tight but the manual says to check it for "BACKLASH". What the fuck does that mean. Somehow you can adjust the amount of backlash but i have no idea how to do it or what the specs for correct backlash are.

 

[Gas Man]

I can't help you. Maybe raywood or alhall...

 

[4thHorsemen]

I've been wondering the same thing for awhile especially since I was recently experiencing the whining on deceleration like Hooligan and I'll do the same steps as him to resolve it.

Okay, I just looked up the definition of backlash online. So I found a different definition when used in terms of machinery:

. Machinery. a. the space between the thickness of a gear tooth and the width of the space between teeth in the mating gear, designed to allow for a film of lubricant, binding from heat expansion and eccentricity, or manufacturing inaccuracies.
b. play or lost motion between loosely fitting machine parts.

This makes sense and now I don't feel so dumb...

 

[avdhunter]

Sounds like you have to adjust the backlash just like a rearend in a truck. now in saying that I have no idea what it is supposed to be. I am assuming you will need a dial indicator to do it though.

 

[DRBarnhart]

I would think if the manual says, "check compensator sprocket for backlash" it's telling you there shouldn't be any.

Afterall, if there was supposed to be some backlash wouldn't the manual say something more like, "make sure the compensating sprocket backlash is less than .005 in.".

:zz2cents: :zz2cents:

Dennis

 

[4thHorsemen]

Agreed, there shouldn't be any backlash. I didn't know what "backlash" meant in mechanical terms and assumed it's more common meaning of "recoil, sudden backward whipping motion" causing only more confusion. Once I read the definition in terms of machinery, I took the manual's "checking compensating sprocket for backlash" as just a visual inspection of the sprocket's teeth. Say the primary chain has more play than it should, upon acceleration the chain's rollers would ride high on the sprocket's teeth causing excessive wear prematurely. That was my take.

 

[DRBarnhart]

I took the manual's "checking compensating sprocket for backlash" as just a visual inspection of the sprocket's teeth. Say the primary chain has more play than it should, upon acceleration the chain's rollers would ride high on the sprocket's teeth causing excessive wear prematurely.

Not exactly... "Checking the sprocket for backlash" would be looking for play between the lobes of the sprocket and the sliding cam since that's what drives it. In other words, when the nut is tightened down is there any axial play in the sprocket. If there were any play it would defeat the purpose of the sprocket and the engine wouldn't put power to the drive train as smoothly.

I think the only thing that would cause the primary chain to ride high on the teeth would be a loose chain...

:zz2cents: :zz2cents: :zz2cents:

Dennis