SERVICE = sé BULLETIN

Jar. Nar. LAVAL (Does not apply to Maok Trucks Australla) INITIAL VALVE LASH ADJUSTMENT — E-TECH™ ENGINES In all heavy-duty diesel engines, an Initial seat-in/wear-in of the Inlet and exhaust valves takes place. This wear-in affects the “balance” adjustment of the valve yokes: and also results in a decrease of valve lash and engine brake slave piston lash. The major amount of this wear-in occurs during the first 50,000 miles (80 000 km) of service, after which the rate \t has been determined that readjusting valve lash to specifications after the Initial wear-in period will eliminate component loadings which can result In breakage of the engine brake and valve train components. Effective with engines produced January 2002 and later (beginning with engine serial No. series 2A), and also with rebuilt engines and replacement cylinder heads, valves must initially be checked and adjusted (if

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