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Главная arrow Тех информация arrow Service Bulletin arrow Bulletin No: 01-018/11 Rattle Noise From Engine Due To Stretched Timing Chain
Bulletin No: 01-018/11 Rattle Noise From Engine Due To Stretched Timing Chain

Bulletin No: 01-018/11

Last Issued: 04/27/2011 

Subject: Rattle Noise From Engine Due To Stretched Timing Chain

BULLETIN NOTE: This bulletin supersedes the previous bulletin 01-053/10, issued on 12/02/10. The REPAIR PROCEDURE and PART(S) INFORMATION has been revised. 

APPLICABLE MODEL(S)/VINS

2007-2011 Mazda CX-7 2.3L Turbo vehicles with VINs lower then JM3ER******352482 Prod. before Sept. 29, 2010)

2007-2011 Mazdaspeed3 vehicles with VINs lower then JM1BL******398222 (prod. before Sept. 29, 2010)

2006-2007 Mazdaspeed6 

DESCRIPTION

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 

1. Verify proper oil change intervals have been preformed.
2. Verify that the noise is coming from the front timing chain cover and/or cylinder head area.
 

TIPS:The noise is heard inside the vehicle with all of the windows rolled up, all accessories turned off, and engine running at normal operating temperature.
Knock pulse is at camshaft speed (1/2 the engine RPMs).

Knock can usally be felt on the No. 3 engine mount.


3. Remove the engine front cover according to the online MS3 instructions or the Workshop Manual (section 01-10 TIMING CHAIN REMOVAL/INSTALLATION).

4. Check the protrusion length of the chain adjuster plunger.

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If it is 17mm (9 exposed notches) or more, replace the timing chain with a modified one according to the online MS3 instructions or the Workshop Manual (section 01-10 TIMING CHAIN REMOVAL/INSTALLATION).
NOTE: DO NOT replace the chain adjuster.

If it is less than 17mm, the noise is not the result of the timing chain stretching concern. Refer to the "ENGINE NOISE" diagnostic procedure in TSB 01-036/10 " DIAGNOSTIC PROCEDURE FOR ENGINE NNOISE REPAIR".

 

 

5. Install the engine front cover according to the online MS3 instructions or the Workshop Manual (section 01-10 TIMING CHAIN REMOVAL/INSTALLATION).

NOTE: Be sure to properly seal the engine front cover using RTV Sealer according to TSB 01-019/11 (OIL SEEPAGE FROM ENGINE FRONT C
OVER) to eliminate the possibility of oil leaks.
6. Verify repair.

 

 
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