Replacing an S2000 Fan Belt/Serpentine Belt/Auxiliary Belt

6 Jul

This job was dead easy, but I’ve been documenting everything else so it made sense to do this too.

Tools required:

  • New Serpentine Belt (GSF Car parts, £12, Part Number: 134VG0030)
  • 14mm Socket

I have a K&N induction kit in there and so I don’t have the massive air box that you may be faced with. If you do, you may want to check this guide for getting the airbox off, it’s pretty straight forward.

I ordered the wrong part form GSF (6PK1137) originally, seems I got the cheaper, shorter one for cars with no aircon unit. The correct length belt is part number 6PK1472.

The terminology is probably the most confusing part for most people and it had me going for a while. “I’m going to replace the serpentine belt” I would say, “You mean the fan belt” they would say, “Erm, I guess so”…

Basically, years ago, this belt would drive the fans too, but these days they are mostly electric, and the engines generally point the wrong way now too. A bit like wing mirrors, nowadays these are mostly connected to the door, but still referred to as wing mirrors, it’s just one of those things. So these:

  • Alternator Belt
  • Ancillaries Belt
  • Auxiliary Belt
  • Serpentine Belt
  • Fan Belt

are all the same thing. The S2000 doesn’t have a cam belt, it has a timing chain due to the high RPM of the engine (a chain is noisier than a belt but more reliable and should last the life of the engine), you can’t easily get to that and I wouldn’t recommend it unless you really know what you are doing, and if you do, you’re probably not reading this!).

Now that’s all cleared up, lets change it. As a rule of thumb, this belt should be changed every 100k miles, mines just about to hit 110k miles and it was flagged at the last service. If you pop the hood and take a look, the belt tensioner has an indicator on it to show you when it’s stretched too much and should be replaced, this was mine before I changed it:

You can just about make out where the indicator is (skip to the end to see what it’s like with the new one on).

Make a note of how it was fitted, it basically goes on the outside of the top and bottom two, and inside the middle two.

Stick a 14mm socket onto the tensioner and push it down (counter clockwise looking into the engine bay) and it will move just enough to slip the old belt off.

Slip on the new belt and make sure that it’s on correctly everywhere, fire up the engine and you’re good to go.

Dead easy.