correct spark plug for mercruiser 140?

[jimmytee]

I have a Mercruiser 140; the Seloc manual calls for a RN6 plug; the plugs in it are a RV15YC4 ( both Champion). The specs look a little different between the two types; is one a sub for the other?

 

[Haut Medoc]

Re: correct spark plug for mercruiser 140?

What year? The book says AC-MR43T....JK

 

[jimmytee]

Re: correct spark plug for mercruiser 140?

yes, thats the AC number....The Champion number in the manual is RN6, but thats not the pug thats in it...

 

[Haut Medoc]

Re: correct spark plug for mercruiser 140?

RBL-8 Champion, according to the book.....JK