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MerCruiser 5.0 TKS - User Manual

MerCruiser 5.0 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

Questions and Answers

  • S
    santosrobinAug 16, 2025
    Why does my MerCruiser 5.0 TKS run rough, miss, or backfire?
    • R
      Robert DavidsonAug 16, 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.
  • M
    Melanie JacksonAug 25, 2025
    How to troubleshoot poor performance in my MerCruiser 5.0 TKS?
    • R
      Richard RussellAug 25, 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.
  • Q
    qsuarezAug 30, 2025
    Why is my MerCruiser 5.0 TKS starter motor not cranking or cranking slowly?
    • E
      Eric QuinnAug 31, 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.
  • U
    uwangNov 8, 2025
    What to do if my MerCruiser Engine will not start or is hard to start?
    • F
      frazieralanNov 8, 2025
      If your engine won't start or is hard to start, consider these potential causes: * The lanyard stop switch may be activated. Check the lanyard stop switch. * You may be using an improper starting procedure. Consult the starting procedure. * There might be an insufficient fuel supply. Fill the fuel tank or open the valve. * The engine could be flooded. Turn the key switch off and wait 5 minutes. Push the throttle only button, push the remote control handle/throttle lever to the 1/4 throttle position, and attempt to restart. * There may be a faulty ignition system component. Service the ignition system. * The fuel filter might be clogged. Replace the fuel filter. * The fuel might be stale or contaminated. Drain the fuel tank and fill it with fresh fuel. * A fuel line or tank...

Summary

Warranty

Mercury MerCruiser Limited Warranty (Gasoline‑Fueled Products Only)

Details the limited warranty for gasoline-fueled MerCruiser products.

3‑Year Limited Warranty Against Corrosion

Covers corrosion damage for a period of three years.

Specifications

Engine Specifications

Lists technical data for 4.3 TKS, 5.0 TKS, and 5.7 TKS engines.

Maintenance

Maintenance Schedule-Sterndrive Models

Lists scheduled maintenance tasks based on time or hours.

Storage

Preparing Power Package for Storage

Steps to prepare the engine and fuel system for long-term storage.

Draining the Seawater System

Procedure for draining the seawater cooling system to prevent freeze damage.

Troubleshooting

Starter Motor Will Not Crank Engine, Or Cranks Slow

Addresses issues with the starter motor failing to crank.

Engine Will Not Start Or Is Hard To Start

Guides on diagnosing and fixing engine starting problems.

Excessive Engine Temperature

Solutions for engine overheating issues.

MerCruiser 5.0 TKS Specifications

General IconGeneral
Engine TypeV8
Horsepower220 HP
Alternator Output65 amp
Displacement5.0L
Fuel SystemTKS (Turn Key Start)
Cooling SystemRaw water cooling
Fuel TypeGasoline
WeightApprox. 950 lbs (431 kg)

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