Page 214 - Latin America Accessories Guide (2020) - 8M0163252

RACING

2.5L Sport Master Gearcase w/o Torque Tab GEAR CONVERSION KIT

Ratio Rotation Torque Tab Shaft Length Part Number Service Housing
1.62:1 RH No S(15) 1687-840561A27 1600-8M0084203
1.62:1 RH No L(20) 1687-840561A28 1600-8M0084203
1.62:1 RH No XL(25) 1687-840561A29 1600-8M0084203
1.75:1 RH No S(15) 1600-8M0084203
1.75:1 RH No L(20) 1600-8M0084203
1.75:1 RH No XL(25) 1600-8M0084203
1.87:1 RH No S(15) 1687-840561T33 1600-8M0084203
43-849189T 2
1.87:1 RH No L(20) 1687-840561T34 1600-8M0084203
To convert a 1.87:1 or 2.00:1 ratio RH rotation gearcase to a 1.75:1 ratio
1.87:1 RH No XL(25) 1687-840561A35 1600-8M0084203 Fits 2.5L outboards
2.00:1 RH No S(15) 1687-840561T36 1600-8M0084203
2.00:1 RH No L(20) 1687-840561A37 1600-8M0084203 WATER PRESSURE RELIEF VALVE KIT
2.00:1 RH No XL(25) 1687-840561A38 1600-8M0084203
WATER PRESSURE RELIEF VALVE KIT
2.5L Sport Master Gearcase Counter Rotation

Ratio Rotation Torque Tab Shaft Length Part Number Service Housing
1.62:1 LH No S(15) 1687-840561A63 1600-8M0084203
1.62:1 LH No L(20) 1687-840561A64 1600-8M0084203
1.62:1 LH No XL(25) 1687-840561A65 1600-8M0084203
1.75:1 LH No S(15) 1600-8M0084203
1.75:1 LH No L(20) 1600-8M0084203
1.75:1 LH No XL(25) 1600-8M0084203 863208A 3
1.87:1 LH No S(15) 1687-840561T69 1600-8M0084203 The purpose of this kit is to regulate engine block water pressure to a maximum of
30 psi and vent excess water overboard.
1.87:1 LH No L(20) 1687-840561T70 1600-8M0084203
Fits all MCM engines in high performance applications where engine block water
1.87:1 LH No XL(25) 1687-840561T71 1600-8M0084203 pressures are exceeding the maximum 30 psi.
2.00:1 LH No S(15) NLA 1600-8M0084203
2.00:1 LH No L(20) NLA 1600-8M0084203 GEARCASE FILLER PLUGS
2.00:1 LH No XL(25) NLA 1600-8M0084203
GEARCASE FILLER PLUGS

2.5L Torque Master Gearcase

Ratio Rotation Torque Tab Shaft Length Part Number Service Housing RACING
1.87:1 RH Yes L(20) 1686-827214T25
2.00:1 RH Yes L(20) 1686-827214T25

OUTBOARD GEAR SET FOR 2.5L MODELS
GEAR CONVERSION KIT 22-8M0163134
Used to fix gearcase water pressure issues with the dual water inlet gearcase not
supplying adequate water prssure and flow to the engine at the high installation "X"
dimension heights that were used with the low water inlet gearcase.
Fits O/B & MCM Bravo gearcases with dual water pickups

43-848855T 2
To convert a 1.87:1 or 2.00:1 ratio RH rotation gearcase to a 1.62:1 ratio
Fits 2.5L outboards

2020 Mercury Precision Parts & Accessories Guide 205