I’m working on replacing the supercharger drive belt (and the idler pulley bearings) on my 2002 S2000 and ran into a snag.

For context, I installed this kit 20 years ago (!) and my memory is definitely not what it used to be.
At this point I’m definitely a “vintage owner” trying to jog the details.

The install instructions say:

I was hoping I could just do all this in reverse order but the problem is:

• There’s no diagram B included in my instructions.
• Nothing in the manual clearly calls out where the tensioner pulley mounting bolt or the tensioner pivot bolt are located.
• And like I said, at this point I hardly remember installing the kit...

Has anyone here done this recently and can give me a breakdown of exactly how to replace the supercharger belt?
A photo or step-by-step would be amazing my search came up very blank.

Thanks in advance - I’d really appreciate the guidance.

 

You should only need to loosen the adjustment bolt to release the tension on the belt, if the tensioner doesn't move loosen pivot bolt slightly.
All these are M10 bolts and use a 14mm head wrench.
With tensioner fully backed out you should be able to slide out the old belt pretty easy, new one might need some convincing to get on.

 

Hey everyone,

Just wanted to circle back and say a big thank you to flanders for the quick reply and for posting that super helpful photo showing exactly where the adjustment bolt is. That made a huge difference.

I also wanted to give a shout‑out to Shad at Comptech USA. I emailed him and he responded immediately with: “Just give me a call and I’ll walk you through it.”
Super cool of him, and incredibly helpful.

Since a few people might run into the same situation, here’s a quick breakdown of the process I went through after talking with Shad. I’ve also attached photos of the process and a couple of my completely destroyed pulley bearings for reference.
Process Breakdown

• First step (per Shad): remove the airbox.
  This opened up a ton of space and made it much easier to see the tensioner pulleys and access the belts and engine pulleys.
• I had already loosened the intercooler and disconnected it from the throttle body so I could push it back a couple inches.
  I didn’t want to fully remove it and deal with coolant refilling, and luckily you don’t have to—just pushing it back gives enough room.
• With the airbox out, I could clearly see the tensioner.
  I loosened that, then removed the supercharger belt first, followed by the engine belt.
• Fortunately, the idler pulley bolt is accessible just below the supercharger mounting plate.
  Tight access, but totally doable.

• Once the idler was off, I spun the engine tensioner pulley and realized those bearings were toast too.
  Replacing them is easy as long as you remember: reverse‑thread bolt → it loosens clockwise.
• There are plenty of YouTube videos on pressing bearings in/out, so I won’t rehash that.
  For reference:
  • I used a 20mm socket to press the bearings out
  • And a 30mm socket to set the new ones in

• Important: pay attention to the order of the pulley bearing assembly.
  I actually laid mine out wrong in a photo, but the video I watched clarified it.
  Correct order is:
  bolt → dust cover → washer → pulley (with bearing) → spacer (engine side)
  On the tensioner, the spacer is built into the arm.

Here are my completely shot bearings!

• Once the new bearings were in, everything went back together smoothly.
  I torqued the idler pulley to 33 ft‑lbs.
  The tensioner pulley I tightened by feel because I couldn’t get a torque wrench between the SC mounting plate and the bolt.
• Installed both belts:
  • Engine belt: 6PK1470
  • Supercharger belt: 6PK1015
    (NOT 6PK0990 like I mistakenly ordered the first time…)
• Supercharger belt tension note:
  Shad told me there isn’t a specific torque spec for tensioning the supercharger belt. Instead, it should be tight enough that you can twist the belt no more than about 90 degrees at its loosest point.
  I checked this before loosening everything, and that’s exactly how tight the old belt was — so I matched that when installing the new one.
• After that, I reinstalled the airbox and reconnected the intercooler to the throttle body.

Hopefully this helps the next person who runs into the same missing‑diagram / mystery‑bolt situation. And again—thanks flanders and thanks Shad at Comptech for the support.