This is a comprehensive Service Repair Manual for the Mercury Mercruiser #6 Sterndrive Units R, MR, Alpha One, Alpha One SS, covering production model years 1983 to 1990. This invaluable technical manual includes detailed diagrams and manufacturers specifications, providing essential instructions for maintaining and servicing your equipment.
MODELS COVERED:
TRANSOM ASSEMBLIES
MC 120R / 140B / 185R / 488R / 898R / 228R / 260R - Serial Number: 6216687 - 6849289
MC Alpha One / Alpha One SS - Serial Number: 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 - Ratio If Serviced With 13:28 Gears - R.H. Serial Number - L.H. Serial Number
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 13:21 Gears - Serial Number
1.98:1 - 0B803866-0C348031
1.84:1 - 0B800854-0C343526
1.50:1 - 0B796473-0C340666
1.32:1 - 0B804807-0C340030
Transom Assembly - 0B815811-0C340333
When making repairs to Sea Ray (Oyster White) sterndrives, follow procedures as outlined for corresponding MerCruiser models as shown in the cross-reference chart provided.
TABLE OF CONTENTS:
1 - IMPORTANT INFORMATION
A - Important Information
B - Maintenance
C - Troubleshooting
2 - REMOVAL, INSTALLATION AND ADJUSTMENTS
A - All Models
3 - STERN DRIVE UNIT
A - Drive Shaft Housing
B - Gear Housing - MR / Alpha One / Alpha One SS
C - Gear Housing - I-R
D - Gear Housing - Alpha One Counter Rotation
4 - TRANSOM ASSEMBLY
A - Service Procedures Requiring Minor Disassembly
B - Service Procedures Requiring Major Disassembly
5 - POWER TRIM
A - Oildyne Power Trim Pump (Plastic Reservoir)
B - Oildyne Power Trim Pump (Aluminum Reservoir)
C - Prestolite Power Trim Pump
D - Trim Cylinders
E - Dual Power Trim Control
F - Auto Trim II
6 - STEERING SYSTEMS
A - Power Steering
B - Manual Steering
7 - CORROSION PROTECTION
A - All Models
Model Specification: Mercury Mercruiser #6 Sterndrive Units R, MR, Alpha One, Alpha One SS Model Year: 1983-1990 Language: English Total Pages: 566 File Format: .PDF Requirements: Adobe Reader ZOOM IN/OUT: YES Printable: YES Compatible: All Versions of Windows & Mac
This manual provides detailed service information, step-by-step repair instruction, and maintenance specifications for your Mercury Mercruiser #6 Sterndrive Units R, MR, Alpha One, Alpha One SS. It is designed as a "Service Guide" for MerCruiser models listed, providing specific information including procedures for disassembly, assembly, inspection, and adjustment, supplemented with photos and illustrations.
All Official Mercury Marine Manuals for MerCruiser Sterndrives and Inboards include easy to follow, step-by-step illustrated procedures based on the complete dismantling, repair, and assembling of boat motors. From the simplest repair to complex procedures, these manuals give you everything you need to do the job with confidence.
Save Money by doing your own repairs! All pages are printable, so you can run off what you need and take it with you into the garage or workshop.
