Mercury Marine 4 Stroke Engine Won't Start

Written by patrick nelson
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Mercury Marine 4 Stroke Engine Won't Start
Look for blistered, cracked or broken insulators (the ceramic part) and replace the spark plug if it is damaged. (old spark plugs image by Rog999 from Fotolia.com)

Performing some basic maintenance will alleviate most starting problems, as will correct off season storage to avoid frozen-water damage. However, if your Mercury Marine four-stroke outboard won't start, there are some steps that you can take. Problems with starting can be related to the battery, fuel or spark plugs. These kinds of issues can be rectified.

Skill level:
Easy

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Things you need

  • Spark Plugs
  • Socket Set

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Instructions

  1. 1

    Charge the battery if the starter won't crank and the engine won't start. Place the charger leads on the battery contacts and allow the battery to charge overnight. Try starting the engine again.

  2. 2

    Check that there is fuel in the tank if the starter motor now cranks, but the engine won't start. If fuel is present, take a look at the fuel lines between the tank and engine, and make sure they aren't kinked. Look for cracks, swelling and leaks in the line and primer bulb. Replace them if they look damaged.

  3. 3

    Inspect the spark plugs if you continue to have problems. Remove the spark plug leads by twisting the rubber boots slightly and pulling them off. Look for blistered, cracked or broken insulators (the ceramic part) and replace the spark plug if it is damaged. Using a socket set, unscrew the spark plug that's damaged and discard it.

  4. 4

    Clean the dirt from the plug seats and hand-turn a new spark plug into the seat. Be careful not to allow dirt into the engine itself. Tighten the spark plugs a quarter turn past finger tight.

  5. 5

    Replace the leads and try to start the Mercury Marine four-stroke engine again.

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