🏷️ Basic Information Identification Make: Mercury Mercruiser Model: #10 Marine Engines GM 4 Cylinder Year: 1985-1989 Generation: Not Specified Product Name Product Name: Mercury Mercruiser Number 10 Marine Engines GM 4 Cylinder Service Repair Manual 1985-1989 Download PDF 📋 Manual Details Manual Information Manual Type: Service Repair Manual Language: English Page Count: 308 Format: PDF Manual Features Printable: True Searchable: True Bookmarked: True Illustrations: True Diagrams: True Wiring Schematics: True Includes Troubleshooting: True Includes Maintenance: True Includes Rebuild Procedures: True Compatibility Operating Systems: • Windows (All Versions) • Mac • APP ISO • iPhone • iPod • Android Delivery Delivery Method: Instant Download Technical Requirements Software Requirements: Adobe PDF Reader Features Zoom Functionality: Yes Searchable Text: Yes ⚙️ Engine Specifications Engine Configuration Engine Type: GM 4 Cylinder Engine Displacement Displacement Liters: 2.5L - 3.0L Displacement Cid: 153-181 CID Engine Power Hp Mcm 120: 120 Hp Mcm 140: 140 Hp Sea Ray 3.0L Later Models: 130 Engine Features Compression Ratio Sea Ray 3.0L Later Models: 9.2:1 Cooling Systems: • Seawater Cooled • Closed Cooled Fuel System: MerCarb 2-Barrel Carburetor Component Compatibility Notes: MCM 2.5L and MCM 3.0L are the same as MCM 120. Sea Ray 3.0L is the same as MCM 140 (later models are rated at 130 HP). Engine Components Engine Block Type: G.M. In-Line Electrical Systems Electrical System Coverage: • Starting System • Ignition System • Charging Systems • Instrumentation • Electrical Kits • Wiring Diagrams Fuel System Fuel Delivery Coverage: • Fuel Delivery System • Fuel Pump • MerCarb 2-Barrel Cooling Exhaust Cooling Exhaust Coverage: • Seawater Cooled Models • Closed Cooled Models • Exhaust Manifolds/Elbows Power Steering Power Steering Coverage: Power Steering 🔧 Maintenance Service Procedures Covered Procedures: • Complete tear down and rebuild • Maintenance • Troubleshooting • Diagnostic procedures • Repair procedures Service Interval Interval Recommendations: Detailed in Section 1B Purpose Target Audience: • Do-it-yourselfer • Experienced mechanic 📄 Models Covered Model Listing Mcm 120 Mr: Serial Number Range: 6853914 to 0A492055 Mcm 120 Alpha I: Serial Number Range: 0A492056 to 0B531853 Mcm 2.5L: Serial Number Range: 0C856450 and Above Mcm 140 Mr: Serial Number Range: 6852270 to 0A484072 Mcm 140 Alpha I: Serial Number Range: 0A484073 to 0B450800 Mcm 3.0L: Serial Number Range: 0C856450 and Above Sea Ray 3.0L: Serial Number Range: 0B787205 to B917530