FUSO 4M4 – Engine – STRUCTURE AND OPERATION – Timing Gears

•Each timing gear has mating mark(s) “1” or “5” to ensure that it is engaged correctly with another gear during installation.

5.1 Idler gear
• The idler gear is press fitted into the idler sprocket, which drives the timing chain, and rotates on the idler shaft.
• The idler shaft is anchored to the crankcase using the idler washer and bolt.
The idler sprocket is fitted with the idler bushing, which is lubricated by engine oil supplied through the oil holes drilled in the idler shaft.