Intermediate Shaft Bolt - 986 Forum - The Community for Porsche Boxster & Cayman Owners

blinkwatt · 10-08-2009, 05:38 AM

Quote:

Originally Posted by Dragonwind

At this point in the game I wouldn't buy a NA 996/997/986/987 without planning on the immediate expense of having the IMS retrofit and clutch. My 99 is in right now for the IMS portion (unfortunately did the clutch just last year). Keep spreading the word Jake!

Chris

...it wasn't so much of an issue with 2.5L engines....you engine sleeves cracked instead.

Dragonwind · 10-08-2009, 06:17 AM

Broken sleeves? I hadn't heard of that being as much of an issue on 2.5L as the larger variants later on. Doesn't worry me, I drive it as much as possible anyways!

Chris

10-08-2009, 07:30 AM

They all have the potential to crack. 3.4 and 3.6 motors are likely to be seeing more of this as the mileage racks up, as the few that we've measured the bores on all show deformation across the thrust axis. As the cylinders become more and more oval, the ductility limit of the metal will be reached sooner or later, and the sleeve will crack. 2.5 and 3.2 motors have the thickest sleeves, but even those have had liner failures.

The only motor that hasn't seen a liner failure yet is the M97 3.8.