Suzuki DF 25 Service Manual page 248

10-24 LOWER UNIT
Adjusting gear backlash
To check the backlash, hold the driveshaft by hand, then gently
rock forward gear back and forth by hand.
Gear backlash : 0.10 – 0.20 mm (0.004 – 0.008 in.)
• If backlash is larger than the specified, thickness of for-
ward gear back-up shim must be increased.
• If backlash is smaller, back-up shim thickness must be
decreased.
Checking and adjusting tooth contact pattern
(Pinion and Forward gear)
Check tooth contact pattern by using the following procedure:
1. To assess tooth contact, apply a light coat of Prussian Blue
on the convex surface of forward gear.
2. Install propeller shaft and housing assembly (minus reverse
gear and internal components).
3. Push propeller shaft inward and hold in position.
4. Using driveshaft holder tool, rotate the driveshaft 5 - 6 times.
09921-29510 : Driveshaft holder
Push