This repair manual covers the 1978-1982 MerCruiser sterndrive models and provides detailed procedures for inspection, service, and overhaul of main components. It does not include general knowledge information. Please refer to the GENERAL INFORMATION section for basic inboard engine or stern drive information and read other sections for proper inspection and service procedures.
TRANSOM ASSEMBLIES COVERED IN THIS MANUAL:
MCM 120 - serial numbers 4891650 to 6216686
MCM 140 - serial numbers 4891650 to 6216686
MCM 165 - serial numbers 4891650 to 6216686
MCM 470 - serial numbers 4891650 to 6216686
MCM 485 - serial numbers 4891650 to 6216686
MCM 898 - serial numbers 4891650 to 6216686
MCM 228 - serial numbers 4891650 to 6216686
MCM 260 - serial numbers 4891650 to 6216686
MC 120 to 260 STERN DRIVE UNITS:
Ratio 1.98:1 - serial numbers 4893635 to 6237860
Ratio 1.84:1 - serial numbers 4893835 to 6225576
Ratio 1.65:1 - serial numbers 4890460 to 6268064
Ratio 1.50:1 - serial numbers 4898730 to 6229157
This manual is based on the latest available information at the time of publication. Differences may exist between the content of this manual and the actual stern drive unit or transom assemblies if modifications have been made since then. The illustrations in this manual demonstrate the basic principles of operation and work procedures.
Intended for use by technicians with basic knowledge and skills in servicing inboard or stern drive motors and components, this manual should be used with caution by those without such expertise. Apprentice mechanics or DIY enthusiasts without proper tools and equipment may not be able to perform the services described properly, which could result in injury or render the component unsafe for the boat operator and passengers. It is important to never attempt to work on MerCruiser components without a manual, as it contains essential safety precautions, service information, and other data.
QUESTIONS AND ANSWERS
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A. Once downloaded, you can store it on your computer forever and refer to it when maintenance and repair is necessary.
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A. Once downloaded, it appears exactly the same as a repair manual you'd buy in stores. It includes every aspect of repair, step-by-step repair procedures, pictures, illustrations, diagrams, troubleshooting, and specifications.
Q. Is the repair manual model and year specific?
A. Yes! This is not a generic manual.
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