Fuel Requirements; Nonferrous Metals And The Fuel System; Diesel Fuel In Cold Weather; Antifreeze/Coolant - Mercury TDI 4.2L Manual

Section 3 - Specifications

Fuel Requirements

Failure to comply with regulations can result in injury from fire or explosion. Electrical system components on this engine are
not rated as external ignition–protected (EIP). Do not store or use gasoline on boats equipped with these engines, unless
provisions have been made to exclude gasoline vapors from the engine compartment (REF: 33 CFR).
Fuel leakage is a fire or explosion hazard, which can cause serious injury or death. Periodically inspect all fuel system
components for leaks, softening, hardening, swelling, or corrosion, particularly after storage. Any sign of leakage or
deterioration requires replacement before further engine operation.
This engine requires diesel fuel. Mixing gasoline, gasohol, or alcohol and diesel fuel can cause serious injury or death due to
fire or explosion. Never mix gasoline, gasohol, or alcohol with diesel fuel.
IMPORTANT: Use of improper or water‑contaminated diesel fuel can seriously damage your engine. Use of improper fuel is
considered misuse of the engine, and damage caused thereby will not be covered by the warranty.
Mercury diesels are required to use Grade No. 2‑D ULSD (ultra‑low sulphur diesel) fuel meeting ASTM Standards D975 (or fuel
rated Diesel DIN EN 590), and having a minimum cetane rating of 40.
BIODIESEL: The blend of diesel fuel used may not contain more than 7% biodiesel fuel. Use of LSD or blends of ULSD fuel
containing more than 7% biodiesel fuel may result in fuel system degradation, injection nozzle clogging, hard starting,
increased oil change intervals, or excessive exhaust smoke.
The cetane number is a measure of the ignition quality of diesel fuel. Increasing the cetane number will not improve overall
engine performance, but it may be necessary to raise the cetane rating for low‑temperature or high‑altitude use. A lower cetane
number could cause hard starting and slower warm‑up, and could increase engine noise and exhaust emissions.
NOTE: If your engine suddenly becomes noisy after a fill‑up, you possibly received substandard fuel with a low cetane rating.
On intermittent‑use engines, high sulphur content diesel fuel will greatly increase:
• Corrosion on metal parts
• Deterioration of elastomer and plastic parts
• Excessive wear of internal engine parts, particularly bearings, and corrosion and extensive damage to other engine parts
• Difficulty starting and operating the engine

Nonferrous Metals and the Fuel System

Nonferrous metals must not be used in the fuel system components. The use of items such as copper lines, brass nipples, or
galvanized tanks may result in an engine power loss or a failure of the injection nozzles.

Diesel Fuel in Cold Weather

Unaltered diesel fuels thicken and gel in cold temperatures unless treated. Virtually all diesel fuels are climatized to allow their
use in the particular region for that time of the year. If it becomes necessary to further treat diesel fuel, it is the owner/operator's
responsibility to add a commercial standard brand of antigel diesel fuel additive, following that product's directions.

Antifreeze/Coolant

Using propylene glycol antifreeze in the closed cooling system can damage the cooling system or the engine. Fill the closed
cooling system with an ethylene glycol antifreeze solution suitable to the lowest temperature to which the engine will be
exposed.
Diesel engines are high‑compression engines that operate at higher temperatures than typical insternal combustion engines.
Therefore, the closed‑cooling system and engine, including related cooling passages, must remain as clean as possible to
provide adequate engine cooling. To ensure proper cooling, we recommend filling the closed‑cooling section of the cooling
system with a low silicate formula of ethylene glycol antifreeze in a solution with deionized water. Common tap water or
softened water contains unwanted minerals that can leave large deposits in the system that restrict the cooling system
efficiency. A low silicate formula prevents the antifreeze from separating and forming a silicate gelatin. This gelatin can block
passages in the engine and heat exchanger, causing the engine to overheat.
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90-8M0114081 DECEMBER 2015
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