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Article #245: Identifying Mercruiser Parts

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Introduction: for below waterline installation and can
Mercruiser is an advanced marine easily be replaced.
propulsion system and is available in Fresh water System:
recreational and commercial vehicles These are the complete pump and pipe
ranging from 1.5-liter displacement to system for circulating fresh water used
14.0-liter displacements. These are for cooling 2 stroke outboard engines.
generally two stroke diesel engine These systems are available with complete
vehicles and are termed as inboards or instructions and can easily be replaced.
stern drives depending on the vehicle Oil Coolers:
design. These are the cylindrical coolers used
Mercruiser parts: for cooling oil and these are available
This water vehicle contains the following in varying sizes from 5" * 1" to 12" *
major parts. 1.25" and sometimes two cylinders
Mercruiser Engine: attached together are provided as dual
These are the heart of any vehicle and coolers.
are available in 4, 6 or 8 cylinders Motor and Gear Lube:
capacities, especially for stern drives. Service manual provides the complete
The engine rating and displacement or instruction to change engine and gear oil
fuel system are also important for a at particular interval and the oil should
specific purpose motorboat. These are the be changed as per the direction given in
important Mercruiser parts and every manual.
engine contains a tag specifying details Some other important mercruiser parts
of the engine. include electrical system; power
Carburetor: steering, couplers and stern drive parts.
Carburetor is attached to the fuel Identifying the mercruiser parts:
delivery system and filters and regulates A tag is attached to identify engine
the supply of fuel to the engine. The model, serial number of engine, transcom
carburetor can be identified by its assembly serial number and drive serial
design (filtering and regulating fuel) or number. Similarly for inboard
matching its design from the catalogue or transmission, model and serial numbers
manual provided with the boat. are provided on a tag on the top or side
Exhaust Manual: of transmission. You should verify the
These Mercruiser parts are used for tag details to the manual provided to you
removing combustion gases from engine by the manufacturer and both the details
through exhaust manifold. These are should match.
attached to the exhaust system. Once you have located the correct model
Water and Fuel Pumps: number with specified transmission
Raw water pumps or circulating water details, you should see the parts details
pumps are used for cooling outboard as figure of each part has been provided.
engines by continuously circulating You should identify the figure from
water. These pumps are supplied with full catalogue or manual provided to you or
instructions and can be replaced easily. you should visit the web site of the
Fuel pumps are small nozzles through manufacturer. Once the parts
which fuel, which is generally diesel, is corresponding to the figure has been
injected to the engine. identified, you should note down the
Marine Mufflers: serial number supplied in the catalogue
These are the silencers made from or web site. Once you are able to locate
fiberglass and are designed for the exact part number and corresponding
backpressure compensation and resistant serial number, it is easy for you to
from corrosion. These are in cylindrical purchase these parts directly from
shape from varying diameter of 1.5" to manufacturer or resellers.
12" inlet and outlet. These are suitable






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