1983-1990 Mercruiser Sterndrive Units R, MR, Alpha One, Alpha One SS Service Manual #6
Mercury Marine Part Number 90-12934-2 10/97
This factory service manual provides service information, step-by-step repair instruction and specifications for your
Mercruiser Sterndrive
This comprehensive overhaul and repair manual is designed as a "Service
Guide" for MerCruiser models listed. It provides specific information
including procedures for disassembly, assembly, inspection and
adjustment, to enable dealers and service mechanics to keep the
MerCruiser in top operating condition. The procedures are 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, this manuals
give you everything you need to do the job with confidence.
Transom Assemblies:
MC 120R/140B/185R/488R/898R/228R/260R
MC 120MR/140MR/170MR/185MR/190MR/200MR/
230MR/260MR/300 Tempest MR
MC Alpha One/Alpha One SS
Sterndrive Units:
MC 120R-260R
MC 120 MR - 300 TEMPEST MR
MC ALPHA ONE / ALPHA ONE SS
Sea Ray Sterndrive Units and Transom Assembly (Oyster White)
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
5 – POWER TRIM
A – Oildyne Power Trim Pump
B – Prestolite Power Trim Pump
C – Trim Cylinders
D- Dual Power Trim Control
D – Auto Trim II
6 – STEERING SYSTEMS
A – Power Steering
B – Manual Steering
7 – Corrosion Protection
Publisher: Mercury Marine February 10/97
Product Dimensions: 12 x 9 x 2.3 inches
Shipping Weight: 1.0 kg
Approx 700 pages.
Out of print
Original OEM, not a reprint or copy