Mercury 30 Service Manual

6-16 - LOWER UNIT 90-826148R2 MARCH 1997
Inspection
Upper Drive Shaft Bearing
1. Inspect bearing for rust, roughness or discolor-
ation from lack of lubricant.
2. DO NOT remove bearing from drive shaft unless
bearingmustbereplacedasremovalprocesswill
damage bearing.
3. If bearing must be replaced, position drive shaft
assembly in vise (jaws of vise supporting only
bearing) and while holding drive shaft, strike top
ofdriveshaftwithleadhammeranddrivebearing
off.
a
a - Bearing
4. To install new bearing, thread old pinion nut 3/4
way onto drive shaft. Position Universal Puller
Plate(91-37241)underbearingandpressonpin-
ion nut while holding drive shaft until bearing
seats against shoulder.
52387
a
b
c
a - Old Pinion Nut (Nut Should be Above Drive Shaft)
b - Bearing
c - Universal Puller Plate (91-37241)
Pinion Gear Bearing
1. Inspect bearing for rust, roughness or discolor-
ation from lack of lubricant.
2. If bearing is damaged, bearing and race must be
replaced as an assembly.
3. If race appears to have spun in drive shaft bore,
gear case housing must be replaced.
52823
a
b
a - Bearing
b - Race
Pinion Gear
1. Inspect pinion gear teeth for rust, chipping, ex-
cessive wear (teeth are sharp edged) or broken.
2. If pinion gear teeth are damaged, also inspect
forward and reverse gear teeth for damage.
3. Replace gears as required.
52839
Forward Gear
1. Inspect forward gear teeth for rust, chipping, ex-
cessive wear (teeth are sharped edged), or bro-
ken teeth.
2. Inspect forward gear clutch jaws for wear.
Rounded jaws indicate the following:
a. Improper shift cable adjustment.
b. Engine idle speed too high.

Mercury 30 Specifications

General

Horsepower	30 HP
Cylinders	3
Displacement	526 cc
Gear Shift	F-N-R
Fuel Induction System	Electronic Fuel Injection (EFI)
Shaft Length	20 in
Steering	Remote / Tiller