Carpokes Porsche Forum

Hi all,

I'm looking to buy an ArnnWorx tension tool (or a reasonably priced 9201) if anyone has one collecting dust.
I'm aware that I could probably get away with the "twist" method, a Krikit tool, or even the 3D printed tool, but I would really like to have the right tool for the job - especially with it being my first time setting the tension.

I am feverishly working on a replacement for the Arnnworx tool. Won't be ready for several months though. Different design but will work on all models and be more precise than the 3D printed tool. That said, the 3D printed tool is surprisingly accurate. Certainly better than the 'twist' method in terms of consistently getting it within the range Porsche spec'd, especially for newcomers with no 'feel' for how tight they should be.

Glad to hear that, Tom! From what I’ve seen in your other posts, it’s clear you’re going above and beyond to fill the gap left by Bruce’s retirement—something the community truly appreciates. I’ll probably 3D print the timing belt tool to verify my results, but I’ll need to find a different approach for the balance shaft belt.

Where are located?

I'm located in southwest Ohio

joeyfic wrote: Wed Mar 05, 2025 6:25 pm I'm located in southwest Ohio

I was going to suggest just borrowing a factory tool from someone local (thinking you might be local to me).

I've just had someone reach out to me and offer to let me borrow an early version (3.13) of the ArnnWorx tool, so I’ll likely take them up on that until I can find one for myself. If you decide to create your own version, I’d be more than happy to assist with testing and sharing my results!

I once read that folks make to much of a big deal tensioning the timing belt. From experience I tend to agree with that. Yes of course you have to take care in doing it right as there definitely is a wrong way, to loose or to tight.

I found this video very useful and basically the method I’ve used. Pluck it like a guitar string, has worked for me.

Anyone notice in the video that the balance belt tensioner pulley installed is a timing belt tensioner pulley.
Also, the specification for clearance between the balance shaft belt and idler is 0 to a negative value. Meaning the idler should be touching the belt run or deflecting it upward slightly.

Be prepared for a learning curve regarding the correct feel when using the Arnworks tool. This is especially true if you have a 16 valve motor which uses a wider timing belt.