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| Mazda Engine >> REVISED ROCKER ARM REDUCES NOISE
Revised Rocker Arm Reduces Lifter Noise On
1987-90 Mazda 2.2L (B2200) Engines
The AERA Technical Committee has recently become aware of a revised rocker arm that may reduce lifter noise on 1987-90 Mazda 2.2L engines. Generally this noise occurs only at engine startup, when the vehicle has not been used for a longer period.
When the engine starts, an insufficient quantity of oil reaches the hydraulic lash adjuster (HLA) to refill it. Therefore, the valve train may be noisy until the lash adjuster has been refilled.
The revised rocker arm features a larger oil passage to permit more oil to reach the lash adjuster. The previous passage was .031 in diameter, which has been enlarged to .078 in the revised part. Extended oil change intervals can lead to varnish and sludge buildup in the oil passage aggrevating the problem.
This engine uses a separate intake, Part #F240-12-131B, and exhaust, Part #F240-12-151B, rocker arm. Engines manufactured after September 1, 1989 use the revised rocker arms.
The AERA Technical Committee
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