Replacing Spark Plug Wires

Discussion in 'General Discussion' started by Ralph vaughn, Feb 22, 2021.

  1. Ralph vaughn

    Ralph vaughn Member

    229
    Nov 14, 2018
    Atlanta Ga
    2008 Sea Ray 290
    Raymarine Radar and GPs
    5.0 Sea Core engines and Sea Core Bravo III outdrives
    I’m replacing the plug wires on my SR 290 with 5.0 engines. I was at the boat this afternoon and accessing and removing the plug wires seems daunting. Does anyone have any tips for removing the plug wires?

    Thanks in advance Ralph
     
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Are you having a running problem? I honestly wouldn't change the if everything is OK. But... if you're going to do it, you should do the cap/rotor/plugs, too.

    As far as tips... you'll be doing a lot of this by feel only - it's just something you have to get used to when working on boats. Especially smaller boats with twin engines. Use a sharpie marker to label each plug and/or do one at a time so you don't misplace them if you aren't familiar with the firing order.
     
    Last edited: Feb 28, 2021 at 10:02 AM
    Joint Custody likes this.
  3. Ralph vaughn

    Ralph vaughn Member

    229
    Nov 14, 2018
    Atlanta Ga
    2008 Sea Ray 290
    Raymarine Radar and GPs
    5.0 Sea Core engines and Sea Core Bravo III outdrives
    I’m replacing distributor cap and rotor also. No running problems. Thanks for the advise.

    Ralph
     
  4. paulswagelock

    paulswagelock Well-Known Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB 300 Verado
    Verado 300
    Since access is tight, use some dielectric grease on the boots so pressing the wires on is easier. And get a spark wire pulling tool to help with removal as those old ones might be fused on there. If pulling the wires, when were the plugs last changed? Might suggest tackling that since you are going to get sore and bloody knuckles anyhow....
     
  5. 330DA

    330DA Active Member

    456
    Oct 12, 2006
    New Buffalo, MI
    2000 310 Sundancer, Brig 330 RIB
    350 Horizons, V-Drives
    Spark plug wires should be changed every 3-4 years, per my service manager. I know most won’t do it that often. Look at one of the wires. It will be labeled with the year and quarter it was manufactured. Example (2015 Q1)
     
  6. Joint Custody

    Joint Custody Well-Known Member GOLD Sponsor

    539
    Sep 20, 2017
    Lake Powell Utah
    2001 460 Sundancer
    Twin Cummins 6CTA8
    As said above. If you are going to do the wires Do the plugs at the same time.
    You only will want to do this one time. Lots of bloody knuckles.
    Lots will say dont change them as they dont need it like on cars however I think it gives good peace of mind knowing cap, rotor, wires, plugs are done.
     
  7. Ralph vaughn

    Ralph vaughn Member

    229
    Nov 14, 2018
    Atlanta Ga
    2008 Sea Ray 290
    Raymarine Radar and GPs
    5.0 Sea Core engines and Sea Core Bravo III outdrives
    Had the plugs replaced when I bought the boat in Feb 2020. Ordered new plug wires, distributor and rotor cap and now have the time to replace.
     

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