Sisu Diesel 645 Series Workshop Manual page 46

Broad timing gear casing
4. Assemble the idler gears as in picture. Fit the big idler gear
in its position. Note the position of the timing marks. Fit also
the small idler gear.
5. Tighten the guide bolts in the guide unit frame and position
the unit on the idler gears as in picture (guide bolts in the idler
gear shaft holes and housing holes). Tighten the idler gear
bolts through the guide unit holes, tighten 180 Nm. Remove
the guide unit.
Timing Gear Assembly
6. Check the tooth backlash, which should be 0,05...0,25
mm.
7. Fit the drive unit shaft and camshaft axial controller in the
48--- 8
front cover (apply sealing compound to the thread). Fit the
cover and hit in the tension pins. Observe the idler gear shaft
bolt seals. Fit the drive unit rear bearing and cover.
Note! If the crankshaft oil throwing ring is removed, fit it (drift
9103 94900) before fitting the cover.
8. See instruction 7...9 / Narrow timing gear casing.
9104 05400
48--- 9
8---3
48--- 10