Spark Plug Head Problem

[bret2973]

I bought a new 3.0 mercruiser inboard for my boat I placed it into my boat this week and all I have left is the spark plugs come to find out my spark plugs do not fit.. the threaded area is a larger hole than the spark plug any one heard of such a thing all the part numbers I have looked up seems to be the standard plug>>>><br /><br />Any ideas??????

 

[Bt Doctur]

Re: Spark Plug Head Problem

yep, you have the older head that uses "#44 or #45 spark plugs, 13/16ths socket needed

 

[bret2973]

Re: Spark Plug Head Problem

thanks what do you mean by 44, 45 is that the part number? which spark plug maker

 

[Bt Doctur]

Re: Spark Plug Head Problem

those numbers signify the heat range of the plug.later plugs are R42T,R42TS,MR42T etc.<br />those are Champion numbers higher the numnber ,hotter the plug.