Timing belt reinstall - Another PK tensioner over extended?
06-06-2016, 04:14 PM
#256
Captain Obvious
Super User
Super User
If I had to modify the tensioner, I would bring it to the 2mm minimum range and would put the tensioner in a vertical mill and make the holes oval. This way a pin can be installed behind the bolt to act as a physical stop if the bolts ever loosen up.
06-06-2016, 04:33 PM
#257
Rennlist Member
Thread Starter
Fred: no explanation as to why mine is where it is. Mine is the same as the the other fellows that jumped time. Only similarity I see is our PKT's were purchased close to the same time.
06-06-2016, 04:43 PM
#258
Rennlist Member
I mentioned this a while ago, but I still like the idea of Ken having some PK brackets made for the >8mm situation. The customer exchanges his bracket for one that will bring his extension to 4mm. He could keep half a dozen on hand. I know it's an expense for him, but it would eliminate this particular risk for out of spec. standard installs.
Dave
Dave
06-06-2016, 04:45 PM
#259
Hi Fred, It's been a while, but I think his install extension was 9mm, and it was 10mm after the failure event. Now it's back at 9mm. I think he needs a modification which brings it back to 4-5mm. This is all assuming there are no bent or otherwise damaged parts. Dave
I will probably have to go back to the stock tensioner, though I have no idea how this failure could happen again with the safety roller back in place (even at 10mm of extension).
06-06-2016, 04:51 PM
#260
http://www.nord-lock.com/nord-lock/w...rs/sp-washers/
06-06-2016, 05:18 PM
#261
Inventor
Rennlist Member
Rennlist Member
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
Even before all this, I was thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
06-06-2016, 05:25 PM
#262
Rennlist Member
I've said this a few times now, but it keeps getting drowned out.
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
I have been thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
I have been thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
How much pulley movement corresponds to that 4mm?
Thanks,
Dave
06-06-2016, 06:08 PM
#263
Rennlist Member
Thread Starter
I've said this a few times now, but it keeps getting drowned out.
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
Even before all this, I was thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
Even before all this, I was thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
06-06-2016, 06:09 PM
#264
I've said this a few times now, but it keeps getting drowned out.
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
Even before all this, I was thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
Even before all this, I was thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
06-07-2016, 12:04 AM
#265
Three Wheelin'
I've said this a few times now, but it keeps getting drowned out.
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
Even before all this, I was thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
Subsequent batches of PKT brackets will go back to the original (prototype) design with about 2mm less extension. The only change for most installations will be to install the T/D AFTER the belt has been strung. I may also include the bolt spacer above for an additional 1.5-ish mm net with T/D modification.
Even before all this, I was thinking about a PKT-C with clear zinc (actually has blue tint) plating because black zinc is more expensive and takes more time at the platers.
06-07-2016, 12:58 AM
#266
Vegas, Baby!
Rennlist Member
Rennlist Member
I started to read this thread, then it turned into a pissing contest, like they all do, so I ignored most of it.
I put Ken's tensioner in my car 3 or 4 years ago, along with Ed's Guardian pump, new timing gears. It all frigging works fine, and I'm happy! If it breaks, I'll buy another engine, or maybe just **** can the 928. Keep my 04 996, and the 930, and be done with it.
Some times you people beat some thing to death!
I put Ken's tensioner in my car 3 or 4 years ago, along with Ed's Guardian pump, new timing gears. It all frigging works fine, and I'm happy! If it breaks, I'll buy another engine, or maybe just **** can the 928. Keep my 04 996, and the 930, and be done with it.
Some times you people beat some thing to death!
06-07-2016, 10:44 AM
#267
Rennlist Member
Ken,
I'm also interested in the latest information and instructions for the PKT upgrade that came out a couple of years ago. I am running two PKT's and recently got two upgrade kits from Roger, but I'm not sure where the upgrade install instructions are. I've looked at liftbars.com but I'm not seeing the instructions there.
I'm also interested in the latest information and instructions for the PKT upgrade that came out a couple of years ago. I am running two PKT's and recently got two upgrade kits from Roger, but I'm not sure where the upgrade install instructions are. I've looked at liftbars.com but I'm not seeing the instructions there.
06-07-2016, 10:52 AM
#268
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The bulletin was sent to all customers who purchased a PKT from 928sRus.
As already said very simple -
1) Check all bolts for tightness and torque as per the instruction.
2) Replace the countersunk screw.
The offer was also made to supply two bolts, washers and nuts to upgrade the gold system to the black system. Purely a customer decision. Ken had noted on the Audi forums that there was benefit to locating the lever and roller on the bracket with through bolts as opposed to bolts threaded into the bracket its self.
As already said very simple -
1) Check all bolts for tightness and torque as per the instruction.
2) Replace the countersunk screw.
The offer was also made to supply two bolts, washers and nuts to upgrade the gold system to the black system. Purely a customer decision. Ken had noted on the Audi forums that there was benefit to locating the lever and roller on the bracket with through bolts as opposed to bolts threaded into the bracket its self.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
06-07-2016, 11:06 AM
#269
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The PKT System notice was sent out in February 2014.
I forwarded a copy of the one sent to you Don.
I forwarded a copy of the one sent to you Don.
Last edited by ROG100; 06-07-2016 at 11:51 AM.
06-07-2016, 11:09 AM
#270
Nordschleife Master
What are you describing or comparing?
Last edited by GlenL; 06-07-2016 at 11:53 AM. Reason: Fixed price...