Yamaha T-60 Service Manual download pdf (Page 118)

6-25

E

LOWR

SHIM SELECTION

Example:

If M is “28.60 mm” R is “–1”, then

T2 = 28.60 – 28.00 + 1/100 = 0.61

NOTE:

● Use a minimum number of shims to

obtain the thickness equal or nearly equal

to the calculation.

● Install the shims with the thicker one on

the outer side.

163015-0*

MEASURING THE BACKLASH

NOTE:

● Do not install the water pump compo-

nents when measuring the backlash.

● Both forward and reverse gear backlashes

should be measured.

● If both the forward and reverse gear back-

lashes are larger than specified, the pinion

may be too high.

● If both forward and reverse gear back-

lashes are smaller than specified, the pin-

ion may be too low.

● If either of these conditions exists, then

check the pinion shim selection.

1. Place the shift rod in neutral.

2. Install a dial gauge on the gear case.

3. Install a backlash indicator gauge (spe-

cial service tool) on the drive shaft (50,

60, 70 hp: 18 mm in diameter, 75, 80, 90

hp: 20 mm in diameter) and make the

dial gauge stem contact the mark on the

indicator gauge.

Available shim thickness:

0.10, 0.12, 0.15, 0.18, 0.30, 0.40

and 0.50 mm

Dial gauge:

YU-3097/90890-01252........... 1

Magnet base:

YU-34481/90890-06705......... 2

Backlash indicator:

YB-6265/90890-06706 ........... 3

Backlash adjusting plate:

YB-7003.................................. 4

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