Timing belt reinstall - Another PK tensioner over extended?
#272
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PKT with AP (includes Audi parts) $408
PKT no AP (includes Audi parts) $395
Never been $495
87 to 95 stock system - boot, O ring, clamp, gasket, bush x 2, small roller & large roller $240 - add the later WP v using an earlier WP with a PKT and it becomes more expensive. $430 v $395.
85 to 86 32v S3 - same parts $340
I did not add the tensioner bolt as nobody does this - or if they do very rare.
PKT no AP (includes Audi parts) $395
Never been $495
87 to 95 stock system - boot, O ring, clamp, gasket, bush x 2, small roller & large roller $240 - add the later WP v using an earlier WP with a PKT and it becomes more expensive. $430 v $395.
85 to 86 32v S3 - same parts $340
I did not add the tensioner bolt as nobody does this - or if they do very rare.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
![thumbsup](https://rennlist.com/forums/graemlins/bigok.gif)
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
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#273
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When it's stated that the factory tensioner has never caused a failure, it's BS. I've seen multiple parts of the system fail, but those that say this already know this.
#274
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PKT with AP (includes Audi parts) $408
PKT no AP (includes Audi parts) $395
Never been $495
87 to 95 stock system - boot, O ring, clamp, gasket, bush x 2, small roller & large roller $240 - add the later WP v using an earlier WP with a PKT and it becomes more expensive. $430 v $395.
85 to 86 32v S3 - same parts $340
I did not add the tensioner bolt as nobody does this - or if they do very rare.
PKT no AP (includes Audi parts) $395
Never been $495
87 to 95 stock system - boot, O ring, clamp, gasket, bush x 2, small roller & large roller $240 - add the later WP v using an earlier WP with a PKT and it becomes more expensive. $430 v $395.
85 to 86 32v S3 - same parts $340
I did not add the tensioner bolt as nobody does this - or if they do very rare.
So you're comparing the new parts for the T-belt job that you don't need with the PKT.
Personally, if the bearings feel smooth, the rollers and water pump go back in. All I plan on is the boot, gasket and nylon bushings.
#275
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Personally, if the bearings feel smooth, the rollers and water pump go back in. All I plan on is the boot, gasket and nylon bushings.
#276
Nordschleife Master
#277
Nordschleife Master
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I have seen a perfect water pump get bearing play in 5k km and 2 years. Due to this I will never reuse a water pump.
The tensioner bearing is small and with the loads the stock system has should be replaced every time.
#278
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Originally Posted by Lizard928
Those of us that do this for a living would never consider doing this.
I have seen a perfect water pump get bearing play in 5k km and 2 years. Due to this I will never reuse a water pump.
The tensioner bearing is small and with the loads the stock system has should be replaced every time.
I have seen a perfect water pump get bearing play in 5k km and 2 years. Due to this I will never reuse a water pump.
The tensioner bearing is small and with the loads the stock system has should be replaced every time.
#279
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#1 on the list - the rollers followed by anything else that touches the belt.
Think about it....there is less than a thimble amount of grease (of what quality nobody knows) squirted into those bearings. At some point the bearing is going to fail and take the belt with it.
Only in very, very rare occasions does a belt fail without any outside assistance.
We should call it a roller and water pump job, the belt is just along for the ride.
#280
Nordschleife Master
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Still... I'm working in a different set of motivations than the pro mechanics. I've done some work for friends/acquaintances and I use the "as-needed" approach. And I let them have the final say and responsibility on what gets replaced. As for my own cars, my mechanic works cheap and actually gets a bonus for money not spent.
I'd really like to see hard data on belt failures and the root causes. Following along for a few years, the failed parts in the majority of cases are the pivot bolt and the water pump. That pivot bolt gets over-tightened and then bends or fails. The water pump simply wears out.
This is a good point.
Last edited by GlenL; 06-07-2016 at 05:07 PM.
#281
Nordschleife Master
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There was an old member on here who had someone do some work on his GTS, demanded he reuse a bunch of parts, then blamed him for it not lasting and causing bent valves.
I will never make the mistake that fellow did.
I do it all, or I don't do it at all.
I will never make the mistake that fellow did.
I do it all, or I don't do it at all.
#282
Under the Lift
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I have installed Ken's system on a couple of cars. One was a GTS, done years ago with no word of any problem, the other an early 16 valve a week ago. Also, I have a kit on my parts shelf that I bought very early on intended for my car, never installed. I'm watching this thread for how the upgrades/mods/revisions settles out. I don't know now what would prompt me to install it. I tend to be an early adopter, so I bought the kit, but haven't felt impelled to install it on my car. I have no strong feelings one way or the other. I can see potential advantages for Ken's system as well as potential pitfalls; hence, the discussions here and my several years of delay in installing it on my car. I just regret the name calling and personal attacks that have appeared. Like Charlie said in one of these threads: It's like watching your parents fight. Very disturbing, especially when it veers away from facts and technical discussions into nastier digs from one side or the other. Hopefully it will settle down and some positive result will be found.
#283
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Tensioner extension is 10mm.
Had to go in to change a failed Laso water pump.
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#284
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Note there is a low priced core exchange program for the final 'S' bracket which covers a wider range of engines (at the expense of a couple more steps during installation).
(Limited number available, with or w/o the new air-pump accessory bracket. See web page for details.)
(Limited number available, with or w/o the new air-pump accessory bracket. See web page for details.)
#285
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Note there is a low priced core exchange program for the final 'S' bracket which covers a wider range of engines (at the expense of a couple more steps during installation).
(Limited number available, with or w/o the new air-pump accessory bracket. See web page for details.)
(Limited number available, with or w/o the new air-pump accessory bracket. See web page for details.)
I'm going to do my cam gears this winter so I will upgrade the bracket then if I stay with the PKT.