- I referred to it before changing the belt on my Elise for the first time.
Here are some details for 2011 Elise SC owners. The polyrib belt supplied by Lotus on my vehicle was a Goodyear Gatorback 4060790 6PK2005. The belt has 6 ribs, is 13/16 inches or 20mm wide and the effective length of the belt is 79.0 inches or 2005mm.
Goodyear doesn't sell the Gatorback anymore. Goodyear belts were actually made by Veyance Technologies and Continental AG bought Veyance
. So Gatorbacks belts and some other Goodyear products are now branded ContiTech.
Here in the big city of Denver, no one sells Goodyear or ContiTech, so I bought a Gates K060790. This has the same dimensions as the OEM belt. Eventually, I'll be looking for a vendor that can supply a Gates K060785RB - that's their blue racing belt. It is 78.5 inches effective length (1/2" shorter), but I think it will still fit.
I used the same basic procedure Nessal detailed. I removed only the underbody tray (and not the wheel well liner) and accessed the belt and tensioner from below. The tensioner is like a shock with very slow compression and fast rebound. So put some tension on your wrench (towards the back of the vehicle), wait a few seconds for the tensioner to compress, then repeat 4 or 5 times to get enough slack in the belt to remove it.
As shown in the picture below, once the tensioner was compressed to where I could remove the belt, I held my breaker bar in place and under tension with a big Tywrap between the end of the breaker bar and the axle. This let me fool with removing the old belt and installing the new belt without having to compress the tensioner again. Once the new belt was in place, I just cut the Tywrap off and slowly released the tensioner.
Since these seem to be hard to find, I drew a belt routing diagram for the 2011 Lotus Elise SC with AC:
The easiest way to install the new belt is to start with the supercharger pulley at top and thread the belt over the pulleys working counter clockwise - but skip the water pump. Then when the belt is over all the other pulleys, finish up by sliding the smooth back side of the belt over the water pump pulley.