1985-1989 Mercury Mercruiser #10 Marine EngineS GM 4-Cylinder Workshop Service Repair Manual Download PDF

This manual can be used by anyone from a first time owner/amateur to a professional technician.Easy to read type,And give you all the information needed to do the procedure correctly. MODELS COVERED: Models and Serial Number MCM 120 MR-6853914 to 0A492055 MCM 120 Alpha I-0A492056 to 0B531853 MCM 2.5L-0C856450 and Above MCM 140 MR-6852270 to 0A484072 MCM 140 Alpha I-0A484073 to 0B450800 MCM 3.0L-0C856450 and Above Sea Ray 3.0L-0B787205 to B917530 NOTICE: MCM 2.5L MCM3.0L - Same as MCM 120. Sea Ray 3.0L-Same as MCM 140 (Later Models are rated at 130 HP and have 9.2:1 Compression ratio.) TABLE OF CONTENTS: SECTION 1 - Important Information A - Important Information B - Maintenance C - Troubleshooting SECTION 2 - Removal & Installation A - 4 Cyl. 153-181 CID (2.5-3.0L) B - Driveshaft Extension Models SECTION 3 - Engine Mechanical A - G.M. In-Line SECTION 4 - Electrical Systems A - Starting System B - Ignition System C - Charging Systems D - Instrumentation E - Electrical Kits F - Wiring Diagrams SECTION 5 - Fuel Systems A - Fuel Delivery System B - Fuel Pump C - MerCarb 2-Barrel SECTION 6 - Cooling and Exhaust A - Seawater Cooled Models B - Closed Cooled Models C - Exhaust Manifolds/Elbows SECTION 7 - Power Steering A - Power Steering Keep this shop manual handy and use it often. Performing routine,preventive maintenance will save you time & money by helping to prevent premature failure and unnecessary repairs.