chain keeps slipping/making a loud noise

[kamden5689]

I have a 420 chain on a 40 series torque converter. when ever I give it a little gas it slips. as long as I slowly accelerate it doesn't slip but the slightest kick and it slips and makes a loud noise. I have the motor as far forward as possible. I'm stuck at this point. anyone have any ideas?

 

[landuse]

I have a 420 chain on a 40 series torque converter. when ever I give it a little gas it slips. as long as I slowly accelerate it doesn't slip but the slightest kick and it slips and makes a loud noise. I have the motor as far forward as possible. I'm stuck at this point. anyone have any ideas?

Are your sprocket teeth worn? This could cause slippage

 

[cavfire]

Worn teeth is a definite possibility, especially with the drive sprocket as there are less teeth. Another thing to check is the sprocket alignment. They need to be inline and parallel to each other.

Something else to check is if the motor is twisting when the chain comes off. This one happened to me after changing the engine's cam and head along with raising the engagement speed of my torque converter. Engine came with a rubber insulator between it and the frame. Stock motor it was fine, but after doing the work to the motor it seemed like I couldn't tighten it enough to keep from twisting. Pulled out the insulator and found a soft foot on a corner that I shimmed and no problems since.

If the sprocket teeth, chain, and alignment are good then you'd be surprised how loose a chain can be without popping off. Sprocket manufacturers recommend a minimum chain wrap of 120° on the smallest sprocket. Now I'm not saying run it loose, but if everything is right the chain shouldn't pop off from a little slack.

 

[itsid]

teeth are fine as to be seen in his very similar first thread here


My guess: it's not the chain, it's the belt that slips!
too much dirt on the pulleys is the main cause for slip there,
you MUST cover the TC up if you go offroading... belt pulleys do not like mud on their sheaves.


'sid

 

[Hellion]

My guess: it's not the chain, it's the belt that slips!

Well, you were a bit stumped at first. I feel gratified now as TC and chains (and slipping) mentioned in the same sentence, don't go together.

We all have our "off" days. No worries, mate.

 

[itsid]

Well, you were a bit stumped at first. I feel gratified now as TC and chains (and slipping) mentioned in the same sentence, don't go together.

We all have our "off" days. No worries, mate.

Talking about being stumped at first...

So you're saying as long as a chain is in use behind the TC... a TC belt can't slip?
I'm sorry to inform you, that a TC belt ALWAYS slips.. yes, fully engaged, perfectly set up, ideal final gear ratio and the belt is constantly slipping.
that's what causes the belt weardown over time.. It's minimal, true.. but it's still slip;
Just as your tires wear down for the very same reason... slippage.

A wet/dirty or worse greasy belt/pulley and the belt will slip badly especially under heavy load changes (quick acceleration)

and the noise... well that's covered in the other thread

Sorry pal, but as you said... no worries ..

'sid

 

[landuse]

And belts slip even more with high gear ratios