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MerCruiser Sterndrive TDI 3.0L - User Manual

MerCruiser Sterndrive TDI 3.0L
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© 2012 Mercury Marine
TDI 3.0L Diesel Sterndrive Models
*8M0070851*
90-8M0070851 812
Declaration of Conformity—Mercury Diesel Sterndrive (VW)
This sterndrive engine when installed in accordance to Mercury Marine's instructions complies with the requirements of
the following directives by meeting the associated standards, as amended:
Recreational Craft Propulsion Engines with the Requirements of Directive 94/25/EC as amended by 2003/44/EC
Name of engine manufacturer: Volkswagen Antriebssysteme
Address: HMA‑E/1, PO 7962, Industriestraße Nord
Town: Salzgitter Post Code: 38231 Country: Germany
Name of Authorized Representative: Brunswick Marine in EMEA Inc.
Address: Parc Industriel de Petit‑Rechain
Town: Verviers Post Code: 4800 Country: Belgium
Name of Notified Body for exhaust emission assessment: International Marine Certification Institute (IMCI)
Address: Rue Abbé Cuypers 3
Town: Bruxelles Post Code: B‑1040 Country: Belgium ID Number: 0609
Name of Notified Body for noise emission assessment: International Marine Certification Institute (IMCI)
Address: Rue Abbé Cuypers 3
Town: Bruxelles Post Code: B‑1040 Country: Belgium ID Number: 0609
Conformity assessment module used for exhaust emissions:
B+C B+D B+E B+F G H
Conformity assessment module used for noise emissions:
A Aa G H
Other Community Directives applied: Electromagnetic Compatibility Directive 2004/108/EC
Description of Engines and Essential Requirements
Engine Type
Fuel Type Combustion Cycle
☒ z or sterndrive with integral exhaust ☒ Diesel ☒ 4 stroke
Identification of Engines Covered by This Declaration of Conformity
Name of engine model or engine
family:
Unique engine identification number(s) or engine
family code(s)
EC Type–examination
certificate or type‑approval
certificate number
TDI 2.5L 100/120 TDI 100‑5/TDI 100‑5 SE EXVWM003
TDI 2.5L 140/150/165 TDI 150‑5/TDI 150‑5 D/TDI 165‑5 EXVWM004
TDI 3.0L 225/230/265 TDI 225‑6/TDI 230‑6/TDI 265‑6 EXVWM007
TDI 4.2L 285/350 TDI 285‑8/TDI 350‑8 EXVWM008
Essential requirements
Standards
Other normative
document/ method
Technical file
Please specify in more detail
(* = mandatory standard)
Annex 1.B—Exhaust Emissions
B.1 engine identification
B.2 exhaust emission requirements ☒* *EN ISO 8178‑1:1996
B.3 durability
B.4 owner's manual ISO 8665:1995
Annex 1.C—Noise Emissions
C.1 Noise emission levels ☒* *EN ISO 14509
C.2 Owner's manual Owner's manual

Table of Contents

Questions and Answers

  • P
    Phillip SchneiderAug 14, 2025
    What causes poor performance in a MerCruiser Sterndrive TDI 3.0L?
    • J
      Jose BoyerAug 14, 2025
      Poor performance in your MerCruiser engine can arise from several factors. Ensure the throttle is fully open by inspecting the throttle cable and linkages. A damaged or improper propeller can also be the cause, so replace it. Excessive bilge water, an overloaded or improperly distributed boat, or a fouled or damaged boat bottom can also contribute to the issue; address these accordingly. If these steps don't resolve the problem, have the electronic fuel system checked by a Mercury Diesel authorized repair facility.
  • J
    Jennifer DonaldsonAug 17, 2025
    What to do if the MerCruiser Sterndrive TDI 3.0L will not start, or is hard to start?
    • P
      Paul RobinsonAug 17, 2025
      If your MerCruiser engine is not starting or is hard to start, several factors could be at play. First, verify that the lanyard stop switch is not activated. Ensure you are following the correct starting procedure. Check that the fuel tank is not empty and the fuel shut-off valve is open. Inspect the throttle for proper movement and check for faulty wire connections. Other potential issues include clogged fuel filters (replace them), stale or contaminated fuel (drain and refill with fresh fuel), a kinked or clogged fuel line or tank vent line (replace or clear the lines), air in the fuel injection system (purge it), or a faulty electrical stop circuit, glow plugs, or electronic fuel system (have these serviced by a Mercury Diesel authorized repair facility).
  • E
    Evan ChandlerAug 20, 2025
    Why does my MerCruiser Sterndrive TDI 3.0L run rough, miss, or backfire?
    • K
      Kerry BowenAug 20, 2025
      A rough-running, missing, or backfiring MerCruiser engine can stem from several causes. Make sure that the throttle operates properly without any binding or obstructions. Check and adjust the idle speed if it's too low. Replace clogged fuel or air filters. If the fuel is stale or contaminated, drain the tank and refill it with fresh fuel. Also, inspect the fuel and fuel tank vent lines for kinks or clogs; replace or clear them as needed. Finally, purge the fuel injection system to eliminate any air.
  • D
    Deanna CampbellAug 25, 2025
    What to do if my MerCruiser Engine starter motor will not crank engine, or cranks slow?
    • J
      Jeffrey PetersonAug 25, 2025
      If the starter motor won't crank the engine or cranks slowly, first ensure the battery switch is on and the remote control is in the neutral position. Check and reset any open circuit breakers or replace blown fuses. Inspect all electrical connections and wires, especially the battery cables, for looseness or dirt; clean and tighten any faulty connections. Finally, test the battery and replace it if it's bad.
  • M
    manuel31Aug 30, 2025
    What causes a MerCruiser Sterndrive TDI 3.0L battery to not charge?
    • M
      Michael HendersonAug 30, 2025
      If your MerCruiser engine's battery is not charging, there are a few potential causes. First, try turning off any non-essential accessories to reduce the current draw from the battery. Check all electrical connections and wires, especially the battery cables, for looseness or damage; clean and tighten any faulty connections, and repair or replace any damaged wiring. Also, inspect the alternator drive belt for looseness or poor condition and replace or adjust it. Finally, test the battery to determine if it is in unacceptable condition.
  • J
    Jason MccallSep 3, 2025
    Why is there low oil pressure in my MerCruiser Sterndrive TDI 3.0L Engine?
    • C
      Christopher JacksonSep 3, 2025
      Low oil pressure in your MerCruiser engine can be attributed to several factors. Begin by checking the oil level in the crankcase and adding oil if it's insufficient. Conversely, if there's excessive oil, remove the required amount and investigate the cause, such as improper filling. Also, consider whether the oil is diluted or of improper viscosity; if so, change the oil and oil filter, using the correct grade and viscosity, and determine the cause of the dilution, such as excessive idling. For faulty senders, have the system checked by a Mercury Diesel authorized repair facility.
  • K
    Kendra JacobsSep 6, 2025
    What to do if MerCruiser Power Trim Does Not Operate and the Electric Motor Does Not Operate?
    • U
      ulowerySep 6, 2025
      If the power trim on your MerCruiser does not operate and the electric motor is not running, start by checking the fuse and replacing it if it's blown. Inspect all associated electrical connections and wires, especially the battery cables, for looseness, dirt, or damage. Clean and tighten any faulty connections, and repair or replace any damaged wiring.
  • C
    Connie RiceSep 10, 2025
    What to do if MerCruiser Power Trim Does Not Operate, but the Electric Motor Operates?
    • H
      Heather SparksSep 10, 2025
      If your MerCruiser power trim is not working but the electric motor is running, the trim pump oil level may be low; fill it with oil. Also, the drive unit might be binding in the gimbal ring; check for obstructions and consult a Mercury Diesel authorized repair facility.
  • S
    Sarah RobertsNov 26, 2025
    What causes excessive temperature in a MerCruiser Engine?
    • V
      Victoria DrakeNov 26, 2025
      Excessive engine temperature in your MerCruiser can result from several issues. First, ensure the water inlet or seacock is open. Check the drive belt for looseness or poor condition and replace or adjust it as needed. Clear any obstructions from the seawater pickups or sea strainer. Low coolant level in the closed cooling section can also cause overheating; check for leaks and refill with the proper coolant solution. Other potential causes include heat exchanger cores plugged with foreign material, loss of pressure in the closed cooling section, a faulty seawater pickup pump, a restricted or plugged seawater discharge, a kinked seawater inlet hose, or the use of an improperly designed hose on the inlet side of the seawater pump. For thermostat issues, cleaning the heat exchanger, testing ...

Summary

Section 1 - Warranty

Warranty Policy - Diesel Models

Details warranty policy for diesel models, including high-output recreational use limitations.

3-Year Limited Warranty Against Corrosion - Diesel Models

Outlines the 3-year limited warranty against corrosion for diesel models used recreationally.

Warranty Policy - Australia and New Zealand

Specifies warranty policies for Australia and New Zealand, including MerCruiser Limited Warranty.

Section 2 - Getting to Know Your Power Package

Engine Component List

Identifies and illustrates key components of the 3.0 Liter TDI engine from front, starboard, and port views.

Features and Controls

Describes key engine features and controls, including the lanyard stop switch.

Standard Instrumentation Panel

Details the gauges and functions of the standard instrumentation panel.

Power Trim

Explains the function of power trim for sterndrive angle adjustment and trailering.

Engine Electrical System Overload Protection

Covers fuses protecting electrical circuits and overload protection for power trim and MerCathode.

Section 3 - On The Water

Safe Boating Suggestions

Provides essential safety tips and recommendations for operating a boat on the water.

Basic Boat Operation

Covers fundamental boat operation, duty cycle ratings, and pleasure duty ratings for marine engines.

Starting, Shifting, and Stopping

Details the procedures for starting, shifting gears, and stopping the engine safely.

Freezing Temperature and Cold Weather Operation

Advises on precautions for operating and storing the power package in freezing temperatures.

Impact With Underwater Hazards

Warns about potential damage from striking underwater objects and safe operating speeds.

Section 4 - Specifications

Fuel Requirements

Specifies the required diesel fuel grade, cetane rating, and warnings about fuel contamination.

Antifreeze;Coolant

Details the correct type of antifreeze/coolant for the closed cooling system and warnings against propylene glycol.

General Engine Specifications

Provides key technical specifications for the engine, including type, displacement, and weight.

Section 5 - Maintenance

Routine Maintenance

Lists daily, weekly, and bi-monthly maintenance checks for optimal engine performance.

Scheduled Maintenance

Outlines maintenance tasks based on operating hours or time intervals (annually, 100/200/500/1000/2000 hours).

Engine Oil

Covers checking, filling, and changing engine oil and the oil filter.

Sterndrive Gear Lube

Provides instructions for checking, filling, and changing sterndrive gear lube.

Propellers

Details procedures for removing and installing Bravo Sterndrive propellers for various models.

Drive Belt

Discusses drive belt inspection, failure identification, and replacement recommendations.

Battery

Discusses battery precautions, especially for multiple engines, and handling during storage.

Section 6 - Storage

Preparing Your Power Package for Seasonal or Extended Storage

Outlines essential steps before storing the power package for seasonal or extended periods.

Seasonal Storage Instructions

Provides specific instructions for seasonal storage, including flushing the cooling system.

Recommissioning

Details procedures for recommissioning the engine after storage, including checks and fluid refills.

Section 7 - Troubleshooting

Troubleshooting Charts

Presents charts to identify possible causes and remedies for common engine starting and running problems.

Excessive Engine Temperature

Lists potential causes for overheating and steps to diagnose and resolve the issue.

Low Engine Oil Pressure

Identifies causes for low engine oil pressure and recommended actions for diagnosis and correction.

Remote Control Operates Hard, Binds, Has Excessive Free-play, or Makes Unusual Sounds

Guides on diagnosing and resolving issues with remote control operation, including stiffness or noise.

Section 8 - Customer Assistance Information

Owner Service Assistance

Advises on obtaining service from authorized dealers and contacting Mercury Marine for assistance.

Replacement Service Parts

Discusses the importance of using compliant replacement parts and specific requirements for marine engines.

Customer Service Literature

Provides contact information for obtaining manuals and literature in various languages.

Ordering Literature

Instructs on how to order service literature, listing required information for US and international requests.

MerCruiser Sterndrive TDI 3.0L Specifications

General IconGeneral
Displacement3.0L
Fuel SystemCommon Rail Direct Injection
Fuel TypeDiesel
Cooling SystemClosed Cooling
Engine CategorySterndrive
AspirationTurbocharged
Max Power260 HP (194 kW)
Max Torque406 lb-ft
Cylinders6

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