Underdrive Pulley Install Guide

[jmatta]

Very good visual, indeed. Do you think the point is strong enough to hold so you could loosen the crank bolt? The only experience I have is that is remotely close is the tool that holds the pulley for removal in an older air cooled 911.

[TroyN]

It is strong enough. The bolt is on there way tighter than the fan/alt nut on the air-cooled 911s incidentally. (just did this mod today)

[CapDunn]

Why not remove the stock pulley with air tools?

[TroyN]

Originally Posted by CapDunn

Why not remove the stock pulley with air tools?

There's no room in there. You could do that if you dropped the engine.

[syncspeed]

It is strong enough, I just cut a large hex key to fit in the hole and it worked like a charm. You will need a large breaker bar and a 24MM socket to get it loose.

[backman_z]

Great write up. Easy to follow instructions. I did it in the wee small hours of the morning today.

The only thing I did differently was to use a screw driver head instead of his leverage contraption. I put the screw head through a hole in the stock pulley, and into the boss (see pics). This held the stock pulley in place while I loosened it.

http://www.flickr.com/photos/backman_z/4845265417/
http://www.flickr.com/photos/backman_z/4845884042/

Thanks again sd/boxster!

[Johnny Danger]

You will quickly notice that the new under drive pulley is dollar for dollar the best bump in performance one can do for their boxster. Good luck.