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2006 496 Mag HO Rear Port side Cylinder Spark Plug removal

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2006 496 Mag HO Rear Port side Cylinder Spark Plug removal

Old 05-10-2021, 01:53 PM
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Default 2006 496 Mag HO Rear Port side Cylinder Spark Plug removal

Hi wondering the best way to replace the port side rear (transom end) Cylinder Spark Plug on a 2006 496 Mag HO engine. It looks like the oil filter line/hose connector is right in the way and another hose as well. Looking for advice on how best to replace the spark plug and wire on this cylinder. It's a single engine and I do have some room on each side of the engine to get under the engine hatch and work on it but not much room. Thanks in advance for your replies.

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Old 05-10-2021, 02:03 PM
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That one is the worst.
Lay on top of the engine, and reach your arms down. That was my best method to get to it.

I also advise using an extension with a wobble on the end of it.
2006 496 Mag HO Rear Port side Cylinder Spark Plug removal-8521445-23.jpg

It used to take me 2 hours to do 7 plugs. And another 1+ hour to get that last one done.
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Old 05-10-2021, 02:24 PM
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Maybe not one of Mother Mercury's best ideas for maintenance.
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Old 05-10-2021, 02:27 PM
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nor the .060" gap sparkplugs.
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Old 05-10-2021, 02:30 PM
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Two wobble sockets, 3 beers and laying on your chest across the engine for the entire time. FYI - be sure and check your wire harness across the top during and after to avoid any wires coming loose or slightly pulled while this occurs.
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Old 05-11-2021, 02:40 PM
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Well hopefully the Merc Engineer that came up with that rear spark plug hose layout/ design is no longer with the company! I sure would like to watch him or her try to swap out that plug in my boat configuration. Well that's 1 big advantage to the future of electric marine power is no spark plugs to deal with!
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Old 05-11-2021, 02:45 PM
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I had to slightly bend/move the oil line and used a spark plug socket with a swivel joint. I was able to lay a little bit down next to the engine to at least get my eyes on it so it wasn’t that bad. I’d tighten the gap up a bit too on the new plugs.
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Old 05-12-2021, 08:20 PM
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I used a 1/4 inch extension with a 1/4 ratchet it wasn't too bad also loosen the clamp that holds that oil line
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Old 05-12-2021, 08:29 PM
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Originally Posted by Sydwayz

I also advise using an extension with a wobble on the end of it.
Attachment 577061
^^^^^ Yes!

I found one of these that has a thinwall 5/8 with the wobble extension on Amazon with the extension permanently attached, then I hooked another wobble extension to it. Between all three ideas you will get it out easily.

To put it back in, I used another thin wall 5/8 on a 6 inch extension with a good rubber washer inside so it didnt move. With a little patience, you can feel the threads catch and screw it in the first 10 turns by hand.
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