Replacement Parts Warning; Do-It-Yourself Maintenance Suggestions - Mercury TDI 3.0L Owner's Operation And Maintenance Manual

Engine components and fluids are hot and can cause serious injury or death. Allow the engine to cool before removing any
components or opening any fluid hoses.
Performing service or maintenance without first disconnecting the battery can cause product damage, personal injury, or
death due to fire, explosion, electrical shock, or unexpected engine starting. Always disconnect the battery cables from the
battery before maintaining, servicing, installing, or removing engine or drive components.
Fuel vapors trapped in the engine compartment may be an irritant, cause difficulty breathing, or may ignite resulting in a fire
or explosion. Always ventilate the engine compartment before servicing the power package.
IMPORTANT: Refer to Maintenance Schedule for a complete listing of all scheduled maintenance to be performed. Some
tasks can be done by the owner or operator, while others should be performed by an authorized Mercury Diesel repair facility.
Before attempting maintenance or repair procedures not covered in this manual, we recommended that you purchase the
appropriate Mercury Diesel service manual and read it thoroughly.
Before performing any maintenance on your Mercury Diesel engine:
• Protect yourself with suitable work clothing and personal protection equipment.
• Stop the engine, remove the ignition key, and press the emergency stop switch.
• Move the throttle to the neutral position.
• Allow the engine to cool.
• Ventilate the engine compartment for at least five minutes before beginning work.
• Disconnect the battery, if servicing any electrical components. Always disconnect the negative (–) lead first and reconnect
it last.

Replacement Parts Warning

Avoid fire or explosion hazard. Electrical, ignition, and fuel system components on Mercury Marine products comply with
federal and international standards to minimize risk of fire or explosion. Do not use replacement electrical or fuel system
components that do not comply with these standards. When servicing the electrical and fuel systems, properly install and
tighten all components.
Do‑It‑Yourself Maintenance Suggestions
Present‑day marine equipment, such as your Mercury Diesel power package, are highly technical pieces of machinery. Special
fuel delivery systems provide greater fuel economies, but also are more complex for the untrained mechanic.
If you are one of those persons who likes to do it yourself, here are some suggestions for you.
• Do not attempt any repairs unless you are aware of the Cautions, Warnings, and procedures required. Your safety is our
concern.
• If you attempt to service the product yourself, we suggest you order the service manual for that model. The service manual
outlines the correct procedures to follow. It is written for the trained mechanic, so there may be procedures you do not
understand. Do not attempt repairs if you do not understand the procedures.
• There are special tools and equipment that are required to perform some repairs. Do not attempt these repairs unless you
have these special tools and equipment. You can cause damage to the product in excess of the cost a dealer would
charge you.
• Also, if you partially disassemble an engine or drive assembly and are unable to repair it, the dealer's mechanic must
reassemble the components and test to determine the problem. This will cost you more than taking it to the dealer
immediately upon having a problem. It may be a very simple adjustment to correct the problem.
• Do not telephone the dealer, service office, or the factory to attempt for them to diagnose a problem or to request the repair
procedure. It is difficult for them to diagnose a problem over the telephone.
Your local Mercury Diesel authorized repair facility is there to service your power package. They have qualified factory‑trained
mechanics.
It is recommended you have the Mercury Diesel authorized repair facility do periodic maintenance checks on your power
package. Have them winterize it in the fall and service it before the boating season. This will reduce the possibility of any
problems occurring during your boating season when you want trouble‑free boating pleasure.
90-8M0145546 MAY 2018
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Section 4 - Maintenance
Page 41