This factory service manual PDF download provides detailed service information, step-by-step repair instruction and maintenance specifications for your MerCruiser GM 4 Cylinder Marine Engines. 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. Models Covered in This Manual MODEL - SERIAL NUMBER MCM 120 MR - S/N: 6853914-0A492055 MCM 120 Alpha I - S/N: OA492056-08531853 MCM 2.5L - S/N: OC856450 and Above MCM 140 MR - S/N: 6852270-0A484072 MCM 140 Alpha I - S/N: OA484073-08450800 MCM 3.0L - S/N: OC856450 and Above Sea Ray 3.0L - S/N: 08787205-8917530 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.) Service Manual Outline 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 & Exhaust A - Seawater Cooled Models B - Closed Cooled Models C - Exhaust Manifolds/Elbows Section 7 - Power Steering A - Power Steering Language : English File Format : PDF Delivery method : Download This manual pdf download will come in PDF format, so it's EXTREMELY easy to move around with you from computer to computer. Many mechanics purchase electronics manuals like this and use a laptop near them while doing maintenance! If you don't have a laptop, no problem! Just print out the pages of the manual that you need and you've got a hard copy in front of you while doing your work! Simply throw it away when your finished! It's much easier and quicker than having to deal with a book!. Related Keywords : index of / pdf, download, boat, info, library, boatinfo, service, repair, workshop, book, shop, manual, brochure, bulletin, marine, engine, sterndrive, stern, drive, maintenance, fix, motor, outdrive, outboard, inboard, service manual, repair manuals, maintenance.