Mack Diesel Powered Trucks Maintenance and Lubrication Manual 2002

7) Ja er | AA p= = [sa ET) MT da RE = IVIAINTENANCE =| LUBRICATION | SERVICE g@ BULLETIN: ®) \ NUMBER: SB-213-031 \ LEAN, | DATE: 12/21/01 —™, MODEL: E-Tech™ (Does not apply to Mack Trucks Australla). INITIAL VALVE LASH ADJUSTMENT — E-TECH™ ENGINES 7 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 specificatlons 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 (beginn

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