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Spark Plug Removal 2106 Merc

Old 10-23-2020, 10:35 AM
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Default Spark Plug Removal 2106 Merc

OK I had my new spark plugs in hand, right size socket plug remover, fog oil, etc. Motor is a 2016 115 XLPT EFT Four Stroke. So I remove motor cowl and some other plastic clip on parts and then realize I have take off a few bolts to get to spark plug removal. But (Surprise) I just found out my Merc has something called a "self contained ignition coil" (guess here) with spark plug encased in hard plastic. Now this threw me off since I thought I could screw spark plugs out and put new ones in.

I'm doing all this work while boat is on my dock lift over water. In any case two spark plugs are enclosed in one self contained ignition coil and then another two in another ignition coil. Spark plugs are five years old and I want to replace. So I'm assuming now I have to see if I can disconnect coil unit to find out manufacturer number and then buy two replacements parts? Any idea what part would cost to replace. And how do I know the spark plug gap is right? Is it already preset. Lastly do wires connecting into Coil unit just clip on clip off?

Hopefully a local boat shop that carries Mercury parts stores this ignition coil unit.
Old 10-23-2020, 11:02 AM
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Default Found Part Serial Number

and part did clip off wire connection. Anyway part number is PART - 3054

8M0029482

REV-B

With two spark plugs totally enclosed. So I assume buying this whole unit is present to replace old unit?
Old 10-23-2020, 11:10 AM
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When I look up your motor, I see the 2 cylinder coil pack with wires leading to the spark plugs. Like this?


If so, you can leave them in place and just change plugs.

Last edited by Paulswagelock; 10-23-2020 at 11:23 AM.
Old 10-23-2020, 11:48 AM
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Default Yea - That's it

Thanks for posting picture of part - it matches perfectly. I went to West Marine (boat shop) locally and they didn't have part. Can you recommend a website where I can order? I live in Annapolis area and you would think something like this would be easily replaceable, especially since it deals with spark plugs.

Old 10-23-2020, 11:54 AM
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I didn't read your bottom message. The spark plugs appear to be permanently installed with no thread showing or place for a socket to bite. The whole part is totally encased with no screws. I could take a pair of pliers and try to unscrew or yank old spark plugs out but that probably would do more damage than good. But I agree with you - the part is made to reuse so the question is how to remove existing spark plugs.
Old 10-23-2020, 12:05 PM
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I have never heard of this. Usually when the coil is pushed over the plugs, it is still removable. I don't have this engine, or a Merc, can you take a pic? I looked at every single version of the 115hp 4-stroke motors on boats.net as looking by year only goes up to 2014. Either it shows two coils going to two spark plugs each for a total of 4 plugs or it shows a pencil coil going to each of 4 plugs. It could be that anything newer than 2014 is not there?
Old 10-23-2020, 12:07 PM
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Do you have the manual? It should explain spark plugs...
Old 10-23-2020, 12:13 PM
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Those aren’t the spark plugs in those coils, the plugs are in the other end of the wires in the block. Follow the wires from the dual coil pack to the motor.



Old 10-23-2020, 12:17 PM
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Well another crazy goose chase. Just starting look on the web for 8M0029482 mercury ignition coil. The one showing on ebay seems to match my motor's part and it says "used" for $300. No way am I going that route. Took part to neighbor who is Mr. Mechanic and he didn't see away to remove spark plug. The only thing showing of the (encased spark plug) is the terminal. About half an inch. Man I would love to learn how to get these plugs out and save myself some money.
Old 10-23-2020, 12:19 PM
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OP, post a couple of pics of your engine, specifically where the wires from the coils go. Otherwise you might end up with a much bigger expense than just a set of plugs.
Old 10-23-2020, 12:19 PM
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Originally Posted by Old Skipper View Post
Well another crazy goose chase. Just starting look on the web for 8M0029482 mercury ignition coil. The one showing on ebay seems to match my motor's part and it says "used" for $300. No way am I going that route. Took part to neighbor who is Mr. Mechanic and he didn't see away to remove spark plug. The only thing showing of the (encased spark plug) is the terminal. About half an inch. Man I would love to learn how to get these plugs out and save myself some money.
see above, wrong end sir...
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Old 10-23-2020, 12:19 PM
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Originally Posted by Old Skipper View Post
Well another crazy goose chase. Just starting look on the web for 8M0029482 mercury ignition coil. The one showing on ebay seems to match my motor's part and it says "used" for $300. No way am I going that route. Took part to neighbor who is Mr. Mechanic and he didn't see away to remove spark plug. The only thing showing of the (encased spark plug) is the terminal. About half an inch. Man I would love to learn how to get these plugs out and save myself some money.
Buy a manual!
Old 10-23-2020, 12:21 PM
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Originally Posted by Paulswagelock View Post
see above, wrong end sir...
This ^^^^ The plugs are in the engine, not in the part (coil) that you removed.
Old 10-23-2020, 12:24 PM
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Please post a pick of this encased spark plug. I looked at every version of your motor and this does not show, so either you and your neighbor are misunderstanding something or your motor has been fitted with something that is not standard. What you are state, just does not make sense. You do not need to replace coils, you would need to replace the spark plugs at the other end of the wire that the coil plugs into. 8M0029482 is for the coil assembly Paul posted a pic of and even gave you nice arrows with an explanation.

I would also stay away from your neighbors advice in the future if he was trying to figure out how to get a plug out of a coil and did not recognize the thing you showed him as a coil. It is fairly standard looking.
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Old 10-23-2020, 12:39 PM
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OK, took two pictures. You can see tip of spark plug (terminal) sticking out of coil part. Must be a way to remove, put new plug back in with proper spark plug gap.



Last edited by Old Skipper; 10-23-2020 at 12:46 PM.
Old 10-23-2020, 12:41 PM
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Those are coil terminals. The spark plugs have to be in the engine block. The cable that plugs into goes someplace. Follow that and you'll find your plugs.
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Old 10-23-2020, 12:43 PM
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Nonono - that's not the spark plug: thats the connector for the HT lead that runs to the spark plug. Follow the wires from the right hand side in your picture and you will find the plugs at the other end.

Edit: and don't take any more advice from your neighbor! Mr. Mechanic he is not.
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Old 10-23-2020, 12:47 PM
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Originally Posted by Old Skipper View Post
OK, took two pictures. You can see tip of spark plug (terminal) sticking out of coil part. Must be a way to remove, put new plug back in with proper spark plug gap.


please please please please read what we are telling you.. Scroll up and you will see I solved your mystery over an hour ago. That is not the plug........... you have exceeded my patience level at this point. Good luck.
Old 10-23-2020, 12:53 PM
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Ok, but just saying the spark plug boot (black rubber connection) attached to the two terminal coil points. So I guess I was looking in the wrong place. Usually when I've worked on lawn tractor, push mower you just pulled off the plug boot and then presto the spark plug was showing for socket removal. So I'll put everything back together, reconnect plug boot to coil and then look else where for "real spark plugs".
Old 10-23-2020, 12:59 PM
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Originally Posted by Old Skipper View Post
Ok, but just saying the spark plug boot (black rubber connection) attached to the two terminal coil points. So I guess I was looking in the wrong place. Usually when I've worked on lawn tractor, push mower you just pulled off the plug boot and then presto the spark plug was showing for socket removal. So I'll put everything back together, reconnect plug boot to coil and then look else where for "real spark plugs".
Your mower has the HT wire "built in" to the coil - there's no connection, just a wire coming out with a boot at the other end for the plug. On a boat you have a coil with a removable wire, so it has a connection at both ends. They use the same boot at both ends so the connector on the coil looks just like the spark plug.

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