safulop

Apologies if this is answered in the vast number of threads about it but. . .

My shop is 928 experienced, but not PK tensioner. It mystifies them, but they are impressed with how well my T-belts are running with it.

My question is, when it comes time to replace timing belts, what should I tell them to do with the Porken tensioner in there? They only have experience with the stock system. My impression is that the procedure should be simpler, no?

Thanks,

Sean

Schocki

Yep, easier. Push the piston of the hydraulic actuator back in and insert the safety pin. Change TB.
I would recommend to change the tensioner roller after 50 kmiles oder 10 years (just my oponion)

Dave H.

on VWs and Audis the tensioner roller is typically not changed before the 80k t-belt service.

PorKen

The Audi parts used on the PKT are very long lasting. The pulley usually shows little sign of wear in it's native application which has a wider and heavier belt. All three parts are relatively inexpensive, though, so they could all be exchanged for new. (Part numbers.)


The 1" 928 timing belt is the weakest link. If it were spec'ed in the '90s (vs. the '70s), it would likely have been ≥1.25".


On my own cars, I will just throw a new belt on at 40-50K miles or 4-5 years. More often on my track car. Change the Audi parts every other time. Come to think of it, my '86.5 auto is due by this summer, already.

jbrob007

Ken, Not to get off topic, but what T belt do you use... Gates Standard or Racing? If your using the Racing Belt please let us know the condition when you take it off. I dont think any of them have reached the 5 year mark yet...

Thanks, Joel

PorKen

I've been using Flennor belts. (Flennor is owned by Gates.)

If I was actually tracking my 'track' car, , I would go for the Gates racing/Kevlar belt and change it at the 'regular' interval. If I had the racing belt on my 'regular' cars, it would take a while, but I would probably let it go 60-70K miles, or 6-7 years before I'd change it and the PKT parts at the same time. YMMV!


I open up the front of my engines so often that a high mileage belt doesn't make ¢ent$ for me. I would like to see someone (Lizard) test the high rpm cam retard of different belts, including the racing. I expect the racing belt will retard very little.

safulop

OK great, I think I understand the Porkensioner now. If I tell the shop guys that it is basically like the self-adjusting tensioner in an Audi V6, they will know exactly what to do---they fix a lot more Audi V6's than 928s these days!

Thanks,

Sean

Dave H.

yeah they just won't have the tabs on the cams to use the lock bar...