Mercruiser 4.3 TKL Spark Plug Type

wsquam

Recruit
Joined
Apr 23, 2018
Messages
5
Hello, I am a new member looking for some help. I have a 2013 Mercuiser 4.3 TKS (1A634623). I have seen a lot of conflicting information on spark plugs and gaps, by way of the owners manual, service bulletins, and of course Mercury's parts list has a completely different plug. In any event, I just installed 6 AC-41-993 (Iridium) plugs gapped to 1.14mm / .045" Are these OK or do I need to put a different set in?
Thanks
 

Maclin

Admiral
Joined
May 27, 2007
Messages
6,761
Welcome Aboard!

That information, including the AC spark plug number, should be on the engine cover close to the serIal numbers.
 

wsquam

Recruit
Joined
Apr 23, 2018
Messages
5
Hello and thank you for the response.
Yes, it says AC-41-101. Unfortunately I did not go there first and installed the 41-993 that I saw in the owners manual.
 
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