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  1. #1
    Petty Officer 2nd Class
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    Default Sparkplug Type Required Please.... :)

    Hi guys

    just a quickie -

    engine info - 1972 GM In Line 4 120hp - Serial Number 3254358

    The manual (clymer) calls for AC CR44N2 - and having searched for an equivalent I have come up with NGK BR6ES

    The ones in it are NGK BPR6ES - which have a protruding end -

    Any advice appreciated please - either correct NGK or Champion would be really useful please.

    Cheers

    Adam



    7 BEAUTIFUL kids, 6.00 in the bank, 5 good lakes nearby, 4 weeks paid holiday, 3 jobs, 2 boats and 1 FANTASTIC wife to share it all with

    Praise be! Life is precious - live it

  2. #2
    Rear Admiral Fishermark's Avatar
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    Default Re: Sparkplug Type Required Please.... :)

    I like the AC Delco MR43T.

    The NGK I believe should be BR6FS.

    I would never recommend Champion... but that's just me.

  3. #3
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: Sparkplug Type Required Please.... :)

    Mercruiser calls for the AC CR44N, or NGK BR6ES.
    The BPR6ES is basically the same as a BR6ES as far as how it works. The only thing different is the overall plug height and a fixed or removable terminal end on the plug.

    Compare here.
    http://www.ngk.com/more_info.asp?AAIA=&pid=2197 vs http://www.ngk.com/more_info.asp?oth...15614&pid=3150
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  4. #4
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: Sparkplug Type Required Please.... :)

    Quote Originally Posted by Fishermark View Post
    I like the AC Delco MR43T.

    The NGK I believe should be BR6FS.
    Those are the wrong plugs for his engine, he has a 72, and look at his sn range.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  5. #5
    Petty Officer 2nd Class
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    Default Re: Sparkplug Type Required Please.... :)

    Thanks fishermark

    And Don - cheers buddy - thats the conclusion i came too as well - nice to hear a guru confirm it though.

    I can see how you got it slightly wrong fishermark - the GM I/L4 120 took a different plug up to SN3825578 - then 3825579 on is as you say the BR6FS - it was the P bit and the length i was double checking - but hey mate as I say very grateful for the input

    Cheers guys

    Adam



    7 BEAUTIFUL kids, 6.00 in the bank, 5 good lakes nearby, 4 weeks paid holiday, 3 jobs, 2 boats and 1 FANTASTIC wife to share it all with

    Praise be! Life is precious - live it

  6. #6
    Rear Admiral Fishermark's Avatar
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    Default Re: Sparkplug Type Required Please.... :)

    Oops! Sorry about that. I see that one is tapered and one has the gasket.

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