Last evening my serp. belt tensioner/pulley let go and chewed up the belt. Into a friends garage and an hour later I'm back on the road. No big deal.

The odometer shows a tick less than 148k miles but we've been able to research the truck origin and see where the long block was replaced under warranty early in life and has 80-85k miles on it.

While observing the new belt and tensioner operation, we noticed what I'll define as a slight wobble to the crank pulley. Not like it's about to come out the bottom, but a noticeable runout or wobble, (enough to get your attention).

My Citizen watch makes more noise than this motor when running even after a cold start up and less now that the pulley and belt has been changed. I've owned the truck for the last 8 years, have never had a problem. Getting ready to overhaul the topend with the Texas Speed 212/218 cam kit so the crank balancer and pulley will be coming off anyhow.

Am I overly concerned? I've never noticed this before but I've never looked for it until last night.

Thoughts?
Thanks!

 

anybody?? I'm looking at a new under drive crank harm balancer/pulley and an alternator overdrive pulley.

Appreciate all thoughts and comments.

Thanks, Dave aka V1

 

Take the belt off and run it for a few seconds to see if you still see the pulley wobbling. Check to make sure the bolt is tight as well.

 

Thanks for the reply. My thinking as well. I realize the crank harm. balancer/pulley bolt is a torque to yield bolt, but snugging it for a relatively short period of time is better than loose if that's the issue.

Getting ready to disassemble the whole top end for heads, cam, pump, t-gear/chain set etc.

V1

 

Being that the truck is 14 years old, the elastomer separating the two parts of the balancer could be deteriorating. I recently replaced an ASP underdrive pulley that had this happen and I have heard of stock crank pulleys doing the same.

 

Sounds reasonable. I had a Boss 302 motor in a boat of mine once that actually spun the ring enough that I couldn't set the timing. May just have to order an under drive replacement.
Thanks!

 

My 00 has always had a little wobble and it's never been an issue.

 

Glad to hear this! I noticed mine doing the same thing ever since I put my efans on and could see all the way down to the crank pulley.