Engine - Loud Ticking, Knocking, Rattling Noises: Overview

Bulletin No: 01-012/12

Last Issued: 04/03/2012

Subject:
VARIABLE VALVE TIMING (VVT) NOISE AND/OR TIMING CHAIN NOISE





BULLETIN NOTE

APPLICABLE MODEL(S)/VINS

2006-2007 Mazdaspeed6

2007-2009 Mazdaspeed3

2007-2010 CX-7 2.3L Turbo vehicles with VINs lower than JM3ER******327444 (prod. before Feb. 26, 2010)

2010 Mazdaspeed3 vehicles with VINs lower than JM1BL******295247 (prod. before Feb. 27, 2010)

DESCRIPTION

VVT Noise:





When the engine is first started, some vehicles may exhibit a loud ticking noise from the variable valve timing (VVT) actuator (A). This is caused by the lock pin of the variable valve timing actuator not fully engaging or from a worn lock pin hole

Timing Chain Noise:

With the engine warmed up, some vehicles may exhibit a knocking/rattle type noise from the front timing cover and/or valve (cylinder head) cover below 2,000 rpm. The noise is caused by excessive stretching of the timing chain.

Customers having this concern should have their vehicle repaired using the following repair procedure.





REPAIR PROCEDURE FLOW CHART





COMPARISON PICTURES





PART(S) INFORMATION





WARRANTY INFORMATION