FUSO 4M4 – Engine – TIMING GEAR – Inspection before removal

Inspection: Timing chain elongation
โ€ข Support the cam sprocket with

โ€ข Align the inscribed lines on the adjusting plate and the nut to adjust the exhaust cam sprocket and the intake cam sprocket positions to their normal installed positions.
โ€ข Push the tension lever by hand to make the timing chain taut.
โ€ข Measure the amount of elongation of the timing chain (smallest distance between the two chain portions).
โ€ข Replace the timing chain if the measured distance is below the specified limit.

Inspection: Backlash between gears
โ€ข For each pair of gears, measure the backlash for at least three teeth.
โ€ข If any of the measurements exceeds the specified limit, replace the defective part(s).

Inspection: Idler gear and sprocket assembly end play
โ€ข If the measurement exceeds the specified limit, replace the defective part(s).