MITSUBISHI 4M50 TIMING GEARS AND BALANCE SHAFTS [Installation] • Position the No. 1 idler gear with its ends facing in the illustrated directions. • Press in the gear bushing until sits snugly on the chamfered end of the No. 1 idler gear. • After press-fitting the bushing, remeasure the clearance between it and the No. 1 idler shaft. • Ream the busing if the measurement is below the standard value range.
Inspection: Balance shaft bend • Place supports under the No. 1 and No. 3 journals of the balance shaft and measure the bend of the balance shaft at the No. 2 journal.
NOTE • Turn the balance shaft by one turn and read the dial gauge. Divide the reading by two to obtain the balance shaft bend. • If the measurement exceeds the specified limit, replace the balance shaft.
Installation procedure Installation: Balance shafts • Install all the indicated parts on each balance shaft with their ends facing in the illustrated directions. • Install the balance shaft RH by turning its nut clockwise, and the balance shaft LH by turning its nut counterclockwise.
• Install the balance shaft RH assembly and the balance shaft LH assembly into the crankcase according to the following procedures, which include different instructions between the two balance shafts. • The balance shaft RH can be installed in the crankcase without following any special procedure. (The positioning of the gear of the balance shaft RH will be finally determined by installing the oil pump.)
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