joejoe

Mine was the chain starting to groove the metal tensioner itself....kind of a ticky chainsaw sound.

Adk46

Understanding the source of the ticking sound is important for the failure analysis. 1 for 2 crank revolutions: gear issue. Different rate: chain anomaly running over gears and/or pads. On a bicycle, a stiff link or a link pin half released makes a telltale noise. Something that changes the length of the chain will mean it will be alternately loose and tight as it goes around.

Landseer

So I should have used a timing light to determine the periodicity of the sound relative to some rotating part.

kmascotto

Here was my chain derailment...the pad came apart and the rest is history. 2 bent intake valves and one exhaust. and 2 GT Cams ruined

Mongo

At what mileage are your tensioners and pads going bang? I am at 160,000 on original pads. I am not proud of the fact I haven't changed them since doing a valve cover reseal, but I literally had only about 1mm wear.

Mongo

I don't know how you're keeping it together Landseer, but I would be pitching the "LS3 swap is strategically cheaper" to my wife if I were in the same predicament.

Chris

Well at least you got to keep the head Mine was scrap when it happened.

I used this as an excuse to replace my S4 with GT cams, bummer about your cams though

Landseer

One or two more examples and we can file with the IRS for non profit status as the Chain Derailment support group.

Andy, wife is sorta saying that now... her idea of the LS swap....she says the Suburban has an LS, why not ditch everything else and drive it.

kmascotto

Mine let go at just over 100k miles... really its not to hard to replace the pads...

Mongo

http://www.turnkeyenginesupply.com/t...r-and-harness/

Just talk to XSchop for installation. This price is too tempting if you ask me. Beats an $11k rebuild.

On the other hand, if she wants an LS SUV, push for a 2009+ Denali. L92 is a great motor.


*SIGH* Wives.....

Landseer

Well, she is being more practical than that.

We have a suburban, its in the driveway, she's saying ditch the 3 928's and the barn full of parts.

Real issue here is I neglected maintenance and it bit me.

Mongo

Yep... had that conversation once too. I hope things get better and you get it fixed.

The Forgotten On

My 89 has 194K miles on the original pads. I guess I need to add this to the to do list of items to do when I bite the bullet and do a top end refresh.

Mongo

These failures are starting to sound like RPM vs wear issues. 944S, S2s and 968s wear their chain tensioner pads out faster because their motors are usually wound up past 2500-3000 RPM. For the 928, most cars' pads may not be having high failure rates because higher RPMs are usually not attained due to the engine's torque, or how people drive it (i.e. cruising or freeway in a tall gear)

terry gt

its not the wear on the pads
the plastic gets brittle with heat and age