1986 Mercruiser MCM 120-260 Stern Drive Units Service Manual
This 1986 Mercruiser MCM 120-260 Stern Drive Units Service Manual covers troubleshooting, drive units, and related components. Ref: 90-86137 286
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Models Covered & Key Technical Specifications
Mercruiser MCM 120, 140, 165, 470, 485, 898, 228, 260 (90-86137 286) - 1986 | Stern Drive Units Repository. Engineered Rotational Force: 120 Ft. Lbs. is set to Engine Alignment. Design Storage Capacity: 40 Amp fuses are utilized to protect the electrical system. Documented Fit Tolerances: 125 In. Lbs. is standardized to Gear Housing Bearing Preload. Principal Climate Specs: Year(s) not specified. Advanced Travel Rate: 5000 RPM corresponds to Operating Limit. Primary Clamp Forces: 30 Ft. Lbs. is established at Shift Cable Adjustment.
Manual Description & Preview
Verified Specification Electrical Manual: Inboard Engine (Sterndrive) Official Mercruiser MCM 120, 140, 165, 470, 485, 898, 228, 260 Stern Drives - 1986 Service & Troubleshooting Manual #4 System-Standards
Model-Designation: MCM 120, 140, 165, 470, 485, 898, 228, 260 (90-86137 286) // Equipment-Series: MCM Stern Drive Units / Power Trim Logic // Unit-Designations: 1986 Service & Troubleshooting Manual.
Document Overview
This table outlines key assessment parameters, their associated technical paths, and calibration data for Inboard Engine Sterndrive units.
| Assessment-Parameter | Technical-Path | Calibration-Data |
|---|---|---|
| Engine Alignment | Drive Shaft Housing | 120 Ft. Lbs. |
| Fuel System | Carburetor Adjustment | 25 Ft. Lbs. |
| Electrical Connections | Wiring Harness | 10 Ft. Lbs. |
| Trim Limit Switch | Electrical Testing | 5 Ft. Lbs. |
| Gear Housing | Bearing Preload | 125 In. Lbs. |
| Shift Cable | Adjustment Procedure | 30 Ft. Lbs. |
Table of Contents Summary
- Power Trim System Identification
- Hydraulic System - External Return Lines
- Trim Cylinder Tests
- Electrical System
- Booster Cylinder
Manual Content Details
This manual documents various systems and procedures related to MerCruiser MCM Stern Drive Units. It details the identification of power trim systems, including electrical schematics and hydraulic system layouts for both "Up" and "Down" circuits. Maintenance hierarchies are structured into detailed sections covering component removal, disassembly, inspection, cleaning, reassembly, and installation for critical parts such as trim cylinders, solenoids, and hydraulic pumps.
Procedures for testing and troubleshooting are provided, covering hydraulic system pressure tests, trim cylinder tests, and electrical system checks. Specific guidance is offered for issues like striking objects with light or great force, and diagnostic charts are included for common problems. The manual also details the operation and maintenance of the power steering system, including neutral, left, and right turn modes, along with pressure tests and component breakdowns. Rigorous adherence to these procedures ensures optimal performance and longevity of the drive unit.
Properly requiring the correct procedures for component replacement, this manual references torque specifications for various assemblies, such as the drive shaft housing and gear housing, to ensure proper oscillation integrity and secure mounting. Technical notes and diagrams supplement the repair instructions, providing a comprehensive understanding of the system's configuration and operational parameters.
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