I use a high grade multi-viscosity oil, normally 20w50. I doubt this has much of a role to play in the wear proccess but who knows.

 

Schocki, could you do us a favor and take a clear picture (at an angle like george's) of the wear face of the new pad? That way we can have a baseline.

 

I have 160K on my S4 and the pads look fresh. Have you checked the chains to make sure they are smooth and have nothing that is cutting the pads? I wonder too if the tensioner is putting too much tension on them, thus wearing them faster.

 

Na klar kein Ding!!!

 

Interesting, forgotten about this thread and my post that my tensioner pads looked OK. Well they didn't have the wear but that didn't stop one of the pads from cracking and breaking up and taking a lot of crap with it.

Used to be you could get both the pads seperately but now you can only get one and the price has gone through the roof .. $100.

Checking the condition of the tensoner is a smart idea, make sure the piston travels freely.

New tensioners and chains are cheap compared to the damage when something lets go.

However, unlike the 944/968 camp you rarely hear of issues with the 928's ... just another thing to check I guess when you remove the cam covers.

Chris

 

The "worn" ones and the new ones have a different design. The profile of the "worn" ones matched the chain more completely, and I'm not convinced they are that badly worn. I seem to remember mine looking a lot like them. Notice the shiny rounded area outside the path of the chain... not due to wear, but design. The rollers don't contact the surface of the new design, do they? It seems that the edges of the chain will wear into the surface of the new design pad until the rollers begin to contact the surface of it. All this is based upon my recollection of a single roller chain design... it is, right?

 

Ja. No kidding. The white kills it. Turn off the flash perhaps? Schocki, thanks for the attempt. I guess we'll need to resort to words...

Do the white ones have an indentation on the wear face? Or is the profile flat?

 

Bill, this is more or less my question too (except that GG's do look pretty fragged to me) and why I asked Schocki to see if he could snap some pics. I'm trying to get some evidence about wear rates, but without knowing how the pad starts its life...


Below is a pic of the pads on one side of my '89. Depending upon the initial profile these are either not worn very much at all or are showing some minor wear (at 120k miles.)

 

Without flash makes the picture to fuzzy and yes they are absolutely smooth.

 

https://rennlist.com/forums/showthre...=tensioner+pad

Check out the pic in this thread, its nearly exactly the same as what happened on my passenger head except it also ripped the tensioner mounting of the head. Good part about a 944 is it stops running but a 928 will still run on 4 cylinders.

Anyway if you browse the 944 forums the thought is this kind of failure is caused by the brittleness of the pad not a wear groove.

Just FYI

Chris

 

I have a 944S which I brought at 147K miles with no tensioner pad change having been done. When I disassmbled the motor, I was surprised at how little wear there was (I was expecting much more). I have all new tensioner, J-tube etc. for when it all goes back together. Although my pad did not have much wear, I would be concerned about the 20 year old plastic (which has spent its life having hot oil splashed on it).

The wear on the pads it the original post is very dramatic. Makes one wonder what other factors are at play. I have heard that sometimes the oil feed (J-tube) is damaged, so that would be something else to check.