Measuring The Forward Gear Backlash - Yamaha F30B 2018 Service Manual

l. Determine the distance average, and then
round down the average to 2 decimal plac-
es.
Example:
(mm)
Measurement point "a"
Measurement point "b"
Measurement point "c"
Measurement point "d"
Average
Round-down average (M)
m. Determine the pinion shim (T3) thickness
adjustment using the "Pinion shim (T3) se-
lection table" according to the rounded av-
erage (M) and the deviation (P) stamped
on the lower case. See "Pinion shim (T3)
selection table" (A-18).
TIP:
The (P) mark "a" is stamped on the trim tab
mounting surface of the lower case in 0.01 mm
units. If the (P) mark is unreadable, replace the
lower case.
Pinion shims
0.10/0.12/0.15/0.18/0.30/0.40/
0.50 mm
Example:
(M) = 0.19
(P) = –3
+2
0.20
0.20
0.19
0.18
0.1925
0.19
+4
a
(T3) = 0.60 mm from the "Pinion shim (T3)
selection table".
Stamped value
on the lower
case (P)
n. Remove the special service tools, and
then install the determined pinion shim(s)
(T3).
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲

Measuring the forward gear backlash

• Spray anti-rust lubricant on the gear and
bearings before installation. Do not apply
gear oil to the parts. Otherwise, correct mea-
surements cannot be obtained.
• Keep the parts free of foreign material, such
as dirt and lint.
• When measuring the forward gear or reverse
gear backlash, use the original bearings and
shim(s).
1. Install:
• Forward gear shim (T1)
• Tapered roller bearing outer race
TIP:
• If the original forward gear shim(s) (T1) are
missing, install new shims with a combined
thickness of 0.50 mm.
• Do not reuse a shim if deformed or scratched.
2. Install:
• Forward gear assembly
• Drive shaft
• Pinion
See "Installing the shift rod, drive shaft,
and oil seal housing" (8-19).
• Propeller shaft housing assembly
See "Installing the propeller shaft housing
assembly" (8-20).
3. Check:
• Drive shaft movement
Not smooth  Repeat from step 2.
8-34
Shimming
Pinion height mea-
surement (M)
0.18 0.19

–2

–3 0.60
–4
0.20