Engine - Redesigned Cylinder Block and Pistons

NUMBER: 02-105-08

DATE: 02/28/08

APPLICABILITY: 2008MY Tribeca 3.6L

SUBJECT:
Cylinder Block and Piston Design Change

INTRODUCTION

The purpose of this bulletin is to inform that the cylinder block journal and piston skirt design has been changed. As a result, the ECM logic was also changed. This bulletin provides the new part numbers, countermeasure in production, interchangeability of parts and ECM reprogramming information.

COUNTERMEASURE IN PRODUCTION

The new style cylinder block and pistons were used in production starting in mid-November, 2007 starting with engine # 251543.

The new ECM logic was used in production towards the end of August, 2007.








PART IDENTIFICATION





PART INFORMATION

INTERCHANGEABILITY

The old style pistons cannot be installed in the new style cylinder block.

The new style pistons can be installed in both the old and new style cylinder block. If installed in the old style cylinder block all six pistons must be replaced.





REPROGRAMMING INFORMATION

If the new style cylinder block, pistons, or short block assembly is installed in an early production vehicle, the ECM will need to be reprogrammed.





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