🏷️ Basic Information Identification Make: MerCruiser Model: 4 Cylinder Engines Year: 1985-1989 Generation: N/A (specific models covered) 📋 Manual Details Product Information Product Name: 1985-1989 MerCruiser 4 Cylinder Engine Service Manual PDF Download Manual Number: #8 Mercury Marine Manual Type: Service Manual Format: PDF (Instant Download) Language: English Content Overview Coverage: Inspection, service, and overhaul of main components. Excludes general knowledge. Intended Audience: Technicians with basic MerCruiser knowledge and skills, apprentice mechanics, DIY mechanics. Features: Step-by-step repair procedures, pictures, illustrations, diagrams, troubleshooting, specifications. ⚙️ Engine Specifications Model Variations Covered Models: • MCM 170 MR • MCM 170 Alpha One • MCM 165 Alpha One • MCM 3.7L Alpha One • MCM 190 MR • MCM 190 Alpha One • MCM 180 Alpha One • MCM 3.7 Liter LX Alpha One Displacement Engine Displacement: 3.7 Liters Power Output Horsepower Range: 165 HP to 190 HP (depending on model) Engine Type Engine Configuration: 4 Cylinder Serial Number Ranges Mcm 170 Mr Serial Numbers: 6916779 to 0A475151 Mcm 170 Alpha One Serial Numbers: 0A475152 to 0B434940 Mcm 165 Alpha One Serial Numbers: 0B424941 to 0B774251 Mcm 3.7L Alpha One Serial Numbers: 0B774252 and Above Mcm 190 Mr Serial Numbers: 6917368 to 0A475551 Mcm 190 Alpha One Serial Numbers: 0A475552 to 0B436390 Mcm 180 Alpha One Serial Numbers: 0B436391 to 0B775248 Mcm 3.7 Liter Lx Alpha One Serial Numbers: 0B775249 and Above 🔧 Transmission Drive Systems Drive Type: Sterndrive (Alpha One, MR) Transmission Type: N/A (covered by drive system specifications) 🔧 Maintenance General Guidance Service Scope: Detailed repair from basic maintenance to complete overhaul. Safety Precautions: Included in manual, crucial for safe operation and repair. Technical Notes Illustrations Purpose: Show basic principles of operation and work procedures.