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Replacing your spark plug wires can be easy if you take your time and know your engine information.
Steps
- Read your manual and all the safety tips.[1]
- Read all warnings about fuel, fuel vapors and dangerous moving parts.Advertisement
- Understand that you are working with explosive vapors and sparks so extreme caution must be taken to avoid explosion and or fire.
- Determine your engine rotation (see tips).[2]
- Write down your firing order for your model engine. This information will be listed in your factory Mercruiser Service Manual.[3]
- Get familiar with your cylinder numbering system. GM engines do not have the same cylinder number layout as Ford engines.[4]
- Label each cylinder position such as #1, #2, #3, etc.
- Make sure all your spark plugs are the correct type and that they have been properly installed and tightened.
- Lay out each spark plug wire in order of length.
- Plan ahead so you know which plug wire will reach which cylinder.
- Only install good clean spark plug wires.
- Determine your distributor rotor rotation.
- Label each distributor plug wire pole with White-Out if not already labeled from the factory.
- Refer to your firing order to properly label the distributor cap poles.[5]
- Double check that you have the cap properly labeled as this is where many people get confused.
- Locate the #1 spark plug wire pole on your distributor cap. Your manual can help you ID which pole is #1.
- Install the #1 plug wire to the #1 pole and neatly run the plug wire down to the #1 spark plug.
- Make sure the plug wire snaps firmly onto the spark plug.
- Select the correct length wire for the next cylinder number in the firing order and install it.
- Install each and every plug wire one at a time double checking it's position in the firing order on the cap and on the spark plug.Advertisement
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- QuestionWhat is the firing order for a 350 Vortec?Aloha27Community Answer1-8-4-3-6-5-7-2
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Tips
- The firing order for most Mercruiser sterndrive V8 engines is 1-8-4-3-6-5-7-2Thanks
- Go with your "gut" feeling. If it "feels" like a plug wire didn't snap onto the spark plug correctly, chances are it didn't.Thanks
- Take the time to know which cylinder is which. For example, GM V8 engines (standard rotation sterndrive) have the #1 cylinder on the port side bank up forward and go back in the order #1, #3, #5 and #7 (all odd numbers on the port bank) and the STB bank is #2, #4, #6 and #8. Ford engines number straight back as #1, #2, #3 and #4 so don't get the order mixed up.Thanks
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Warnings
- Read all precautions.Thanks
- Avoid sparks or open flames.Thanks
- Remove all fuel vapors from bilge.Thanks
- Have a clean work area.Thanks
- Have the correct tools.Thanks
- Have a fire extinguisher close.Thanks
- Read the owners manual and shop manual.Thanks
- Work in a well ventilated area.Thanks
- Have adequate lighting.Thanks
- Wear safety glasses.Thanks
- Keep clear of moving parts, belts and pulleys.Thanks
- Damage, injury or death can result from fire or explosion of fuel or fuel vapors so use extreme caution whenever working on your engine.Thanks
- Beware of sharp objects on your motor such as hose clamps as they can cut you.Thanks
- Avoid getting fuel, oils or greases on your skin as some may be dangerous to your health.Thanks
- Have a partner close buy to assist in case of an emergency.Thanks
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References
- ↑ https://www.mercurymarine.com/en/asia/service-and-support/owners-resources/
- ↑ https://www.melling.com/wp-content/uploads/2017/03/marine-engines-standard.pdf
- ↑ https://www.perfprotech.com/blog/tech-articles/find-all-your-mercuiser-secifications-here-such-as-engine-fluid-capacities-horsepower-ratings-and-wiring-diagrams-5886
- ↑ https://www.perfprotech.com/blog/boat-and-engine-technical-tips/marine-engines/mercruiser-engines-block-id-codes-4-cylinder-marine-engines
- ↑ http://chicagoengines.com/marine/marine-firing-orders.aspx
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