Engine - Hydraulic Lash Adjuster Noise Returning to Idle

90mazda02 Category B
Applicable Model/s 1988-'90 626/MX-6
Subject HYDRAULIC LASH ADJUSTER (HLA) NOISE
Bulletin No. 004/90
Issued 6/8/90
Revised



DESCRIPTION

If you encounter a complaint of HLA noise when returning to an idle after freeway driving that continues for approximately one minute, the rocker arm may need to be replaced.

As illustrated, the diameter of the oil passage "A" on the modified rocker arm has been enlarged (0.031 in to 0.078 in). With this modification, oil volume to the HLA increases and the period of HLA noise is reduced.


PARTS INFORMATION

PART NUMBER DESCRIPTION QTY

F201 12 130B Rocker Arm Assembly 6

F201 12 150B Rocker Arm Assembly 6

NOTE:
There are two different configurations for the Rocker Arm Assembly. See page B-63 in the 1990 Workshop Manual for more information.


REPAiR PROCEDURE

1) When removed from the rocker arm shaft, inspect the contact area of the rocker arrn. If it is scratched, replace the rocker arm shaft. Otherwise, due to oil pressure, leakage may result.

2) Please instruct customers to observe scheduled maintenance intervals. Inadequate amounts of oil or oil deterioration may cause the problem to reoccur.


VIN OF PRODUCTION CHANGE

626/MX-6 manufactured in Japan
JM1GD****L1831322 February 1, 1990

626/MX-6 manufactured in U.S.A
1YVGD****L5248982 March 19, 1990