Engine - Valve Train Noise

9220mazda01

Bulletin No.
012/92

Issued
2/17/92

Revised


Category
B


Applicable Model/s
(see below)


Subject
ENGINE VALVE TRAIN NOISE


DESCRIPTION

Some six (6) cylinder 1989-'92 MPV JE and 1988-'91 929 SOHC engines may experience valve train noise for approximately one (1) minute after starting. This may be caused by air being trapped in the Hydraulic Lash Adjuster (HLA).

To prevent air from being trapped in the HLA, the rocker arm shafts have been redesigned to increase oil flow.

Redesigned shafts have been used in MPV models starting September 3, 1991. No production change was made on 1988-'91 929 models with SOHC. 929 models exhibiting valve train noise or MPV models which were produced prior to September 3, 1991 with this same problem should have the redesigned shafts installed.


VIN OF PRODUCTION CHANGE

MPV JM3LV **** N0409900 September 3, 1991
929 None


REPAIR PROCEDURE

Replace rocker shafts according to Workshop Manual procedures in Section B.





PARTS INFORMATION


WARRANTY INFORMATION

Warranty Type Code: A
Customer Comment Code: 82
Damage Code: 99
Part No. of Main Cause: JF01 12 160B or JF01 12 170C
Quantity: 2
Operation No/Labor Hour MPV 929
B0408DRX/2.6 Hr. B0408CRX/2.7 Hr.
w/AC add B0408DRA/0.1 Hr.

NOTE:
Only vehicles within the normal warranty period are eligible for this repair.