Yamaha F150 Service Manual download pdf (Page 174)

LOWR

Lower unit

6-29

63P3F11

3. Calculate the reverse gear shim thick-

ness (T2) as shown in the examples

below.

NOTE:

“R” is the deviation of the lower case dimen-

sion from standard. The “R” mark

a

is

stamped on the trim tab mounting surface of

the lower case in 0.01 mm units. If the “R”

mark is unreadable, assume that “R” is zero

and check the backlash when the unit is

assembled.

Example:

If “M2” is 30.70 mm and “R” is (+3), then

T2 = 30.70 – 29.90 – (+3)/100 mm

= 30.70 – 29.90 – 0.03 mm

= 0.77 mm

4. Select the reverse gear shim(s) (T2) as

follows.

Example:

If “T2” is 0.77 mm, then the reverse gear

shim is 0.78 mm.

If “T2” is 0.79 mm, then the reverse gear

shim is 0.80 mm.

Backlash

(regular rotation model)

6

Measuring the forward and reverse

gear backlash

1. Remove the water pump assembly.

2. Set the gear shift to the neutral position

at the lower unit.

3. Install the special service tools so that it

pushes against the propeller shaft.

NOTE:

Tighten the center bolt while turning the drive

shaft until the drive shaft can no longer be

turned.

Calculation formula:

Reverse gear shim thickness (T2) =

M2 – 29.90 – R/100

Calculated numeral

at 1/100 place

Rounded numeral

1, 2 2

3, 4, 5 5

6, 7, 8 8

9, 10 10

Available shim thicknesses:

0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and

0.50 mm

Shift rod push arm: 90890-06052

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