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Rebuild Head - 470 3.7L

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  • Rebuild Head - 470 3.7L

    I have a 1989 Mercruiser 470 3.7l 165hp motor and I am going to have the head rebuilt. Main reason is it smokes bad on initial start up so I figure the seals must be going out. Plus I wanted to replace the head gasket anyways.

    Does anyone live in the Seattle / Everett area that can recommend a good motor shop that does work on Mercruisers?
    I am going to replace the seals and springs and also have it decked. I might have the seats redone but it just depends on how they look. The motor has about 550 hours (if the meter still works).

  • #2
    Re: Rebuild Head - 470 3.7L

    The head is just a Ford 460 head. Any shop that does auto machine work can work on that head.
    83 Sunrunner 16.5 120 merc Alpha 1 drive SOLD 8/1/13

    1996 Crownline 202BR
    5.7l EFI 0f791070
    Bravo I drive


    • #3
      Re: Rebuild Head - 470 3.7L

      If it's smoking that bad, compression test it too. You could have ring problems as well.
      When I was a kid my family had a glasser. Then my dad got a job.
      It's my boat.... You clean the fish.
      I love my boat. That's why I'm broke.


      • #4
        Re: Rebuild Head - 470 3.7L

        Jay's Automotive Machine Shop - Everett, WA | Yelp
        I have used them twice, no complaints, quality work, they know their business and work was finished on schedule.
        The guy in the yelp review,,,,, he isn't exaggerating .
        36' x 12.5 ' Aluminum, Built by All American Marine, 1989, twin Volvo Penta AQAD41A , DP-A out drives
        Furuno 1623 Radar, (2X) Standard Horizon Matrix VHF radios , Si-Tex Color Max 11" plotter with black box fish finder. Furuno LS4100 depth finder. ZF Mathers Micro Commander Controls.
        Propex HS2800 propane forced air cabin heater.


        • #5
          Re: Rebuild Head - 470 3.7L

          Thanks guys:

          @Thumper - that is what I thought but just wanted to see what others had to say.

          @Islander - Yeah I checked compression last year and all was good.

          @K-2 - I will not go back to Jays. They F'd up a race motor of mine. 'Yeah go out an jump on that bad boy' Jay said. So I did and three laps into practice...BOOM!...the bottom end blew out.

          Unless others chime in I think I will head back to my regular shop.


          • #6
            Re: Rebuild Head - 470 3.7L

            Use whoever you trust. That yelp review is suspicious in my opinion. Looks to me like it was written by Jays.
            Last edited by Walt T; February 27th, 2014, 12:07 PM.


            • #7
              Re: Rebuild Head - 470 3.7L

              .....just my two cents worth:

              I would do a compression AND leak down test PRIOR to loosening the first bolt.

              If the head is worn enough to allow oil past the seals/guides, then I expect the bottom half of the engine to be equally worn. Besides, if you re-work just the top half, the weakest link just got passed to the bottom half....rings first.
              Eddie Petty. #3 Dirt Modified
              Courtland, Virginia
              V-20 Wellcraft
              3.7 470 Mercruiser

              25 Yamaha, 25 Johnson, 25 Evinrude, 9.9 Evinrude, 4 Johnson, 2.5 Johnson


              • #8
                Re: Rebuild Head - 470 3.7L

                Eddie, yes that is a concern of mine. I am still debating if I do the springs or not. I may just have the head dunked, decked, and the seals replaced. The leak down test sounds like a good idea.