This Service Repair Manual covers Mercury MerCruiser Sterndrive R, MR, Alpha 1, and Alpha 1 SS models. These sterndrives are known for their robust engineering and reliability, designed for a wide range of marine applications. The Alpha Series, indicated by the model names, represents a significant advancement in marine propulsion, offering dependable performance and durability for various boating needs. The manual encompasses a broad spectrum of engine options and transmission gear ratios, ensuring comprehensive coverage for these versatile units.
The purpose of this manual is to provide detailed guidance for the maintenance, repair, and servicing of your Mercury MerCruiser sterndrive. It includes essential information on general procedures, troubleshooting common issues, removal and installation of components, adjustments, and specific details regarding the driveshaft housing, gear housing, and transom assembly. Furthermore, it covers critical systems such as power trim, steering, and corrosion protection. With step-by-step procedures, detailed diagrams, and exploded views, this manual is an indispensable resource for owners, mechanics, and technicians seeking to maintain optimal performance and longevity of their sterndrive units.
MERCURY MERCRUISER STERNDRIVE R MR ALPHA 1 ALPHA 1 SS # 6 SERVICE REPAIR MANUAL
Models Covered in This Manual
Transom Assemblies
Model-----------------------------------------------------------------------Serial Number
MC 120R/140B/185R/488R/898R/228R/260R .............................6216687 – 6849289
MC 120MR/140MR/170MR/185MR/190MR/200MR/
230MR/260MR/300 Tempest MR..................................................6849290 – 0A471374
MC Alpha One/Alpha One SS ......................................................0A471375 and Above
Sterndrive Units
MC 120R-260R
Original Ratio-------Ratio If Serviced With 13:21 Gears------------Serial Number
1.98:1 ..................................1.94:1 .....................................................6237861-6854392
1.84:1................................. 1.81:1 ....................................................6225577-6862701
1.65:1 .................................1.62:1 .....................................................6268065-6810537
1.50:1 ..................................1.47:1 ......................................................6229158-6847029
1.32:1 ...................................1.29:1 ....................................................6231571-6663947
MC 120 MR - 300 TEMPEST MR
Original Ratio------Ratio If Serviced With 13:28 Gears--------- Serial Number
1.98:1 ...............................1.94:1 ....................................................6854393-0A476746
1.84:1 ..............................1.81:1.................................................... 6862702-0A470164
1.65:1 ..............................1.62:1.................................................... 6810538-0A475786
1.50:1 .............................1.47:1...................................................... 6847030-0A479506
MC ALPHA ONE / ALPHA ONE SS
Original ------Ratio If Serviced --- R.H. Serial Number---L.H. Serial Number
Ratio With 13:28 Gears
1.98:1............1.98:1...................0A476747 and Above................0C881740 and Above
1.84:1 ...........1.84:1 ...................0A470165 and Above ..............0C884040 and Above
1.65:1 ...........1.65:1 ...................0A475787 and Above.............. 0C881790 and Above
1.50:1 ...........1.50:1 ..................0A479507 and Above ..............0C852908 and Above
1.32:1 ...........1.32:1 ...................0A613927 and Above
Alpha One SS
1.50:1/1.32:1....1.50/1.32:1 .......0A545004 and Above
Sea Ray Sterndrive Units and Transom Assembly (Oyster White)
Original Ratio--------Ratio If Serviced With---------- Serial Number
13:21 Gears
1.98:1..................................................................... 0B803866-0C348031
1.84:1 .....................................................................0B800854-0C343526
1.50:1 ......................................................................0B796473-0C340666
1.32:1 ......................................................................0B804807-0C340030
Transom Assembly................................................ 0B815811-0C340333
CONTENTS:
GENERAL INFORMATION
MAINTENANCE
TROUBLESHOOTING
REMOVAL & INSTALLATION
ADJUSTMENTS
DRIVESHAFT HOUSING
GEAR HOUSING
TRANSOM ASSEMBLY
TRANSOM DISASSEMBLY
POWER TRIM
TRIM CYLINDERS
DUAL POWER TRIM CONTROL
AUTO TRIM II
POWER STEERING
MANUAL STEERING
CORROSION PROTECTION
This is a very comprehensive manual (DOWNLOAD in PDF format) for MERCURY MERCRUISER STERNDRIVE R MR ALPHA 1 ALPHA 1 SS # 6, Features detailed exploded views. This is the same manual that technicians use to fix your vehicles. Manual covers detailed and complete step-by-step written procedures with pictures and diagrams, fully printable-selected pages or whole manual, illustrated. So, you will not be disappointed. This is the manual for Repairs, Maintenance & servicing.
MERCURY MERCRUISER STERNDRIVE R MR ALPHA 1 ALPHA 1 SS # 6 SERVICE REPAIR MANUAL
Models Covered in This Manual
Transom Assemblies
Model-----------------------------------------------------------------------Serial Number
MC 120R/140B/185R/488R/898R/228R/260R .............................6216687 – 6849289
MC 120MR/140MR/170MR/185MR/190MR/200MR/
230MR/260MR/300 Tempest MR..................................................6849290 – 0A471374
MC Alpha One/Alpha One SS ......................................................0A471375 and Above
Sterndrive Units
MC 120R-260R
Original Ratio-------Ratio If Serviced With 13:21 Gears------------Serial Number
1.98:1 ..................................1.94:1 .....................................................6237861-6854392
1.84:1................................. 1.81:1 ....................................................6225577-6862701
1.65:1 .................................1.62:1 .....................................................6268065-6810537
1.50:1 ..................................1.47:1 ......................................................6229158-6847029
1.32:1 ...................................1.29:1 ....................................................6231571-6663947
MC 120 MR - 300 TEMPEST MR
Original Ratio------Ratio If Serviced With 13:28 Gears--------- Serial Number
1.98:1 ...............................1.94:1 ....................................................6854393-0A476746
1.84:1 ..............................1.81:1.................................................... 6862702-0A470164
1.65:1 ..............................1.62:1.................................................... 6810538-0A475786
1.50:1 .............................1.47:1...................................................... 6847030-0A479506
MC ALPHA ONE / ALPHA ONE SS
Original ------Ratio If Serviced --- R.H. Serial Number---L.H. Serial Number
Ratio With 13:28 Gears
1.98:1............1.98:1...................0A476747 and Above................0C881740 and Above
1.84:1 ...........1.84:1 ...................0A470165 and Above ..............0C884040 and Above
1.65:1 ...........1.65:1 ...................0A475787 and Above.............. 0C881790 and Above
1.50:1 ...........1.50:1 ..................0A479507 and Above ..............0C852908 and Above
1.32:1 ...........1.32:1 ...................0A613927 and Above
Alpha One SS
1.50:1/1.32:1....1.50/1.32:1 .......0A545004 and Above
Sea Ray Sterndrive Units and Transom Assembly (Oyster White)
Original Ratio--------Ratio If Serviced With---------- Serial Number
13:21 Gears
1.98:1..................................................................... 0B803866-0C348031
1.84:1 .....................................................................0B800854-0C343526
1.50:1 ......................................................................0B796473-0C340666
1.32:1 ......................................................................0B804807-0C340030
Transom Assembly................................................ 0B815811-0C340333
CONTENTS:
GENERAL INFORMATION
MAINTENANCE
TROUBLESHOOTING
REMOVAL & INSTALLATION
ADJUSTMENTS
DRIVESHAFT HOUSING
GEAR HOUSING
TRANSOM ASSEMBLY
TRANSOM DISASSEMBLY
POWER TRIM
TRIM CYLINDERS
DUAL POWER TRIM CONTROL
AUTO TRIM II
POWER STEERING
MANUAL STEERING
CORROSION PROTECTION
This is a very comprehensive manual (DOWNLOAD in PDF format) for MERCURY MERCRUISER STERNDRIVE R MR ALPHA 1 ALPHA 1 SS # 6, Features detailed exploded views. This is the same manual that technicians use to fix your vehicles. Manual covers detailed and complete step-by-step written procedures with pictures and diagrams, fully printable-selected pages or whole manual, illustrated. So, you will not be disappointed. This is the manual for Repairs, Maintenance & servicing.
