How do I Troubleshoot the Oil Injection System on a 60 HP Mercury Outboard?

Written by will charpentier
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The oil injection system on your 60 HP Mercury outboard injects premeasured amounts of oil into the carburettor when the motor is running, from an oil reservoir using a precisely controlled oil pump. On the 60 HP Mercury outboard, hoses fitted to the cylinders carry the oil back to the carburettor for re-injection into the carburettor again with the fuel. The exhaust will still have a slight blue tinge, though, because the fuel still has some oil in it. When it's more than a tinge, or when it's not blue at all, something is wrong.

Skill level:
Moderately Challenging


  1. 1

    Check the adjustment of the oil injection system if excessive blue smoke is present.

  2. 2

    Watch the motor for white smoke. If it goes away when the engine warms up, it's condensation in the cylinders. If not, check for a cracked head that's admitting water, or a defective head gasket.

  3. 3

    Check the fuel mixture if the smoke is black. Black smoke results from fuel burning rather than exploding in the chamber.

  4. 4

    Check the spark plugs if the smoke is black and the fuel mixture is correct. Black smoke in this circumstance indicates that the plugs aren't hot enough to burn the fuel completely.

  5. 5

    Look at the oil injection lines for evidence of gel. Check the filters for gelatinous clogs as well. This gel build-up indicates poor-quality oil in the system.

Tips and warnings

  • "Excessive" is subjective; if you think it's excessive, check the oil injector's adjustment anyway.

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