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MerCruiser 3.0 TKS - User Manual

MerCruiser 3.0 TKS
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© 2012 Mercury Marine
4.3 TKS, 5.0 TKS, 5.7 TKS Models
*8M0053372*
90-8M0053372 1110
NOTE: The following applies to CE marked products only.
Declaration of Conformity – Mercury MerCruiser
This sterndrive or inboard engine when installed in accordance to Mercury MerCruiser'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: Mercury Marine MerCruiser
Address: 3003 N. Perkins Road
Town: Stillwater, OK Post Code: 74075 Country: USA
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: Det Norske Veritas AS
Address: Veritasveien 1
Town: Hovik Post Code: 1322 Country: Norway ID Number: 0575
Conformity assessment module used for exhaust
emissions:
B+C B+D B+E B+F G H
or engine type approved according to:
stage II of Directive 97/68/EC Directive 88/77/EC
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 ☐ 2 stroke
☐ Inboard engine ☒ Petrol ☒ 4 stroke
Identification of Engines Covered by This Declaration of Conformity
Name of engine family
Unique engine identification number: starting serial number EC Module H certificate number
3.0 TKS OW319169 RCDH1
4.3 TKS OW319169 RCDH1
5.0 TKS OW319169 RCDH1
5.7 TKS OW319169 RCDH1
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
This declaration of conformity is issued under the sole responsibility of the manufacturer. I declare on behalf of the engine
manufacturer that the engine(s) mentioned above complies (comply) with all applicable essential requirements in the way
specified.

Table of Contents

Other manuals for MerCruiser 3.0 TKS

Questions and Answers

  • X
    xhammondAug 21, 2025
    Why does my MerCruiser Engine run rough, miss, or backfire?
    • J
      John LandryAug 21, 2025
      If your engine is running rough, missing, or backfiring, here are some possible reasons: * The fuel filter might be clogged. Replace the filter. * The fuel could be stale or contaminated. If contaminated, drain the tank and fill it with fresh fuel. * A fuel line or fuel tank vent line may be kinked or clogged. Replace any kinked lines or blow out the lines with compressed air to remove any obstructions. * The flame arrestor could be dirty. Clean the flame arrestor. * A component of the ignition system might be faulty. Service the ignition system.
  • J
    Jacob GonzalesAug 23, 2025
    How to troubleshoot poor performance in my MerCruiser 3.0 TKS Engine?
    • P
      Peter WilliamsAug 23, 2025
      If you are experiencing poor engine performance, consider the following: * The throttle may not be fully open. Inspect the throttle cable and linkages for proper operation. * The propeller may be damaged or improper. Replace the propeller. * There may be excessive bilge water. Drain the bilge and check for the cause of entry. * The boat may be overloaded, or the load improperly distributed. Reduce the load or redistribute it more evenly. * The flame arrestor could be dirty. Clean the flame arrestor. * The boat bottom may be fouled or damaged. Clean or repair as necessary. * There could be an ignition problem. Refer to the Engine Runs Rough, Misses or Backfires information.
  • J
    jeffthompsonAug 26, 2025
    What causes low performance in a MerCruiser 3.0 TKS Engine and how to fix it?
    • M
      mwrightAug 26, 2025
      If your MerCruiser Engine is showing low performance, here are some possible causes and solutions: * Ensure the throttle is fully open and inspect the throttle cable and linkages for proper operation. * Replace a damaged or improper propeller. * Drain excessive bilge water and identify the cause of entry. * Reduce the load or redistribute it more evenly if the boat is overloaded or improperly loaded. * Clean a dirty flame arrestor. * Clean or repair a fouled or damaged boat bottom. * Refer to the Engine Runs Rough, Misses, or Backfires section for ignition problems.
  • A
    adamshaileyAug 28, 2025
    Why is my MerCruiser 3.0 TKS Engine starter motor not cranking or cranking slowly?
    • K
      Katherine AtkinsAug 28, 2025
      There are several reasons why the starter motor might not be cranking the engine or cranks slowly: * The battery switch may be turned off - turn the switch on. * The remote control may not be in the neutral position - position the control lever in neutral. * There may be an open circuit breaker or blown fuse - check and reset the circuit breaker or replace the fuse. * There may be loose or dirty electrical connections or damaged wiring - check all electrical connections and wires (especially battery cables); clean and tighten all faulty connections. * The battery may be bad or have low voltage - test the battery and charge if necessary; replace if bad. * The lanyard stop switch may be activated - check the lanyard stop switch.
  • B
    Barbara RuizAug 29, 2025
    What to do if my MerCruiser Engine starter motor will not crank or cranks slow?
    • C
      Carrie LopezAug 30, 2025
      If your MerCruiser Engine's starter motor isn't cranking or is cranking slowly, here's what you can check: * Ensure the battery switch is turned on. * Make sure the remote control is in the neutral position. * Inspect and reset any open circuit breakers or replace blown fuses. * Examine all electrical connections and wires, especially battery cables, for looseness or dirt; clean and tighten as needed. * Test the battery and charge it if necessary, or replace it if it's bad. * Verify the lanyard stop switch is not activated.
  • S
    sheilamilesSep 1, 2025
    Why is my MerCruiser Engine overheating and what to do?
    • A
      Amanda CrawfordSep 1, 2025
      If your MerCruiser Engine is overheating, check these potential causes: * Ensure the water inlet or seacock is open. * Inspect the drive belt for looseness or poor condition; replace or adjust as needed. * Check the seawater pickups or sea strainer for obstructions and remove them. * Consider replacing a faulty thermostat. * If equipped with closed cooling, check the coolant level and look for leaks, then fill with the proper coolant solution. * Clean the Heat Exchanger, Engine Oil Cooler, and Transmission Oil Cooler (if equipped) to remove foreign material. * Inspect the pressure cap and check for leaks in the closed cooling section. * Repair a faulty seawater pickup pump. * Clean exhaust elbows to clear any restrictions in seawater discharge.
  • C
    Charles BrownSep 3, 2025
    What should I do if the battery of my MerCruiser 3.0 TKS will not recharge?
    • J
      Jeffrey PerezSep 3, 2025
      If the battery of your MerCruiser Engine is not recharging, consider these potential reasons: * Reduce the electrical load by turning off non-essential accessories to address excessive current draw. * Replace and/or adjust the alternator drive belt if it is loose or in poor condition. * Test the battery and replace it if its condition is unacceptable. * Inspect all associated electrical connections and wires (especially battery cables) for looseness or dirt; clean and tighten faulty connections, and repair or replace damaged wiring. * Test the alternator output and replace it if necessary.
  • C
    cheryl71Sep 5, 2025
    What causes a MerCruiser 3.0 TKS Engine's remote control to be difficult to move, have excessive play, or make unusual sounds?
    • A
      Andrew AndrewsSep 5, 2025
      If your MerCruiser Engine's remote control is difficult to move, has excessive play, or makes unusual sounds, here are some things to check: * Lubricate shift and throttle linkage fasteners if there is insufficient lubrication. * Remove any obstruction in the shift or throttle linkages. * Check all throttle linkages. If any are loose or missing, see authorized Mercury MerCruiser dealer immediately. * Straighten a kinked shift or throttle cable, or have an authorized Mercury MerCruiser dealer replace the cable if it's damaged beyond repair.
  • J
    jacobdavisSep 7, 2025
    What causes low oil pressure in a MerCruiser 3.0 TKS?
    • T
      Tyrone MaysSep 7, 2025
      If your MerCruiser Engine has low oil pressure, check the following: * Ensure there is sufficient oil in the crankcase by checking and adding oil as needed. * If there is excessive oil in the crankcase (causing it to become aerated), check and remove the required amount of oil, investigating the cause of the excessive oil (such as improper filling). * If the oil is diluted or of improper viscosity, change the oil and oil filter, using the correct grade and viscosity oil, and determine the cause for dilution (such as excessive idling).
  • B
    Bradley TaylorSep 10, 2025
    Why is my MerCruiser 3.0 TKS Engine steering wheel jerky or difficult to turn?
    • A
      andrewcolemanSep 10, 2025
      If your MerCruiser Engine's steering wheel jerks or is difficult to turn, consider these possibilities: * Check the power steering pump fluid level for leaks and refill the system with fluid if low. * Replace and/or adjust the drive belt if it is loose or in poor condition. * Lubricate steering components if there is insufficient lubrication. * Check all parts and fasteners; if any are loose or missing, see an authorized Mercury MerCruiser dealer immediately. * If the power steering fluid is contaminated, see an authorized Mercury MerCruiser dealer.

Summary

Declaration of Conformity

Description of Engines and Essential Requirements

Outlines engine types, fuel, and combustion cycle requirements.

Identification of Engines Covered by This Declaration of Conformity

Lists engine families and identification numbers for conformity.

Annex 1.B-Exhaust Emissions

Specifies standards for engine exhaust emissions.

Annex 1.C-Noise Emissions

Specifies standards for engine noise emissions.

Section 1 - Warranty

Mercury MerCruiser Limited Warranty

Details coverage, duration, and limitations for new products.

Section 3 - On the Water

Carbon Monoxide Poisoning

Awareness and prevention of hazardous CO gas exposure.

Section 4 - Specifications

Fuel Requirements

Guidelines on using appropriate gasoline types and octane ratings.

Engine Specifications

Technical data including displacement, power, and RPM for engine models.

Fluid Specifications

Capacities and types of fluids for sterndrives and engines.

Section 5 - Maintenance

Owner;Operator Responsibilities

Operator's duties for safe operation and upkeep.

Maintenance Schedule

Routine and scheduled service intervals for sterndrive models.

Engine Oil

Procedures for checking, filling, and changing engine oil and filter.

Drive Unit Oil

Steps for checking, filling, and changing sterndrive gear lube.

Section 6 - Storage

Draining the Seawater System

Procedures to prevent freeze damage by draining the cooling system.

Section 7 - Troubleshooting

Engine Will Not Start

Diagnosing and resolving issues related to engine starting problems.

Excessive Engine Temperature

Diagnosing and fixing issues causing engine overheating.

Low Engine Oil Pressure

Troubleshooting causes for low engine oil pressure warnings.

MerCruiser 3.0 TKS Specifications

General IconGeneral
Engine Type4-cylinder
Horsepower135 hp
IgnitionElectronic ignition
Alternator65 amp
Oil Capacity4.5 quarts (with filter)
Starting SystemElectric
Full Throttle RPM Range4400-4800 RPM
Displacement3.0L / 181 CID
Fuel SystemTwo Barrel Carburetor with Turn Key Start (TKS)
Cooling SystemRaw water cooling
Fuel Requirement87 Octane

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