Logo
Results 1 to 4 of 4

Thread: Spark plugs

  1. #1

    Default Spark plugs

    What is the difference between marine spark plug and a auto spark plug?

  2. #2
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,191

    Default Re: Spark plugs

    Ayuh,..... Depends,.....

    With AC Delco, for the Chevy motors, the auto plug is R43T, a steel bodied plug,....

    The Marine version is MR43T, an alloy bodied plug, much less prone to Rust,....
    Any Grease is Better,... Than No grease at All....

  3. #3
    Join Date
    Sep 2008
    Location
    Hague, Virginia, USA
    Posts
    3,700

    Default Re: Spark plugs

    And less prone to meld with a cast aluminum head. However, it's still a good practice to pull the plugs and inspect every season. Then when you re-install put a light coat of high-temp grease on the threads.
    CHawk 25 DLX

  4. #4
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,797

    Default Re: Spark plugs

    The plating on the metal shell....in the better quality plugs.....

Similar Threads

  1. Replies: 6
    Last Post: 07-25-2017, 01:51 PM
  2. Mariner/Yamaha 40hp 1986 thermostat and spark problem, wet spark plugs
    By PatrickMonahan in forum Mercury Mariner Outboard Forum
    Replies: 0
    Last Post: 02-06-2016, 08:49 AM
  3. Spins without spark plugs. Wont spin with plugs installed. 96 SLP 112 HP
    By Stephen Houmard in forum Johnson Evinrude Outboard Forum
    Replies: 3
    Last Post: 04-12-2015, 08:27 PM
  4. Spark plugs
    By rigidrdr65 in forum Mercury Mariner Outboard Archive
    Replies: 1
    Last Post: 07-22-2009, 07:32 AM
  5. Marine spark plugs vs normal spark plugs
    By bgallan in forum Johnson Evinrude Outboard Archive
    Replies: 24
    Last Post: 06-20-2009, 02:07 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •