Welcome Guest - Sign Up today
Welcome Guest - Sign Up today

Announcement

Collapse
No announcement yet.

4.3lx Broken starter bolt hole

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • 4.3lx Broken starter bolt hole

    Well I have figured out the starter problem.

    The PO broke the starter mount hole and welded it.

    I don't think it has the strength to keep the starter tight.

    I am going to try a bolt that is 4.45 and a little thicker.

    I did see a post were someone fixed this same problem. I would love to find this post as it explains how he fixed it.

    Like him the motor is pushing 150+ on compression and don't want to trash motor.

    Please don't respond with you need a new Block.. That's last choice, I don't need the forum to tell me that...

    Thanks..

  • #2
    Re: 4.3lx Broken starter bolt hole

    Got picture of the hole?

    Does it have a flat surface where it's been welded?
    1986 21' Celebrity BR - 350 Mercrusier I/O 260 H.P....Engine Serial #B427596
    1981 18' Checkmate Eluder - Original 898 I/O engine....Replacement engine 1979-350....Serial#-Unknown
    Current..... Completed Restoration....Now on the water!
    1999 GTX Sea-Doo

    Comment


    • #3
      Re: 4.3lx Broken starter bolt hole

      I checked the bottom with a mirror and its flat. Top side is a little rough but i can grind it flat.

      Comment


      • #4
        Re: 4.3lx Broken starter bolt hole

        So the mating surface is flat...Starter to mounting surface.

        Some thoughts.
        Posible to oversize and re - tap the hole?
        Posible a right angle drill
        1986 21' Celebrity BR - 350 Mercrusier I/O 260 H.P....Engine Serial #B427596
        1981 18' Checkmate Eluder - Original 898 I/O engine....Replacement engine 1979-350....Serial#-Unknown
        Current..... Completed Restoration....Now on the water!
        1999 GTX Sea-Doo

        Comment


        • #5
          Re: 4.3lx Broken starter bolt hole

          Yes surface is flat.

          Going to try a little larger diameter bolt. The metric bolt is a little bit thicker.

          Not holding my breathe but i need to try anything and everything.

          The next step if the bolt doesn't work i will need to make some kind of bracket.

          I did find a Mercruiser starter support bracket but not sure if will work on my starter.

          Thanks, and keep the ideas coming

          Comment


          • #6
            Re: 4.3lx Broken starter bolt hole

            Originally posted by Aquatron View Post
            Yes surface is flat.

            Going to try a little larger diameter bolt. The metric bolt is a little bit thicker.

            Not holding my breathe but i need to try anything and everything.

            The next step if the bolt doesn't work i will need to make some kind of bracket.

            I did find a Mercruiser starter support bracket but not sure if will work on my starter.

            Thanks, and keep the ideas coming
            Ayuh,.... Ya need factory standard starter bolts on a Chevy motor,...

            The starter Indexes on the bolts for proper ring gear alignment....
            That's what the knurlin' is for,..
            The newest Merc bolts have rebated heads, 'n that alone is worth New bolts...

            Pull yer motor,... On the floor, it might be fixable,...
            you've got No access in the hull, 'n No chance of success...

            Is it the inboard, or outboard bolt,..??

            Comment


            • #7
              Re: 4.3lx Broken starter bolt hole

              Good advice on the bolts. I used starter bolts that came with it. I guess I need to go to mercruiser dealer and compare the bolts.

              Well tonight I mounted the starter with the bolt on the inside and smoked it down then installed the out board bolt with the repaired weld.

              When I bumped my remote starter switch I was able to watch the starter and it looks like the torque is causing the starter to drop down.

              The bottom line there is a lot of downward movement on the outboard side of the starter. Like it is allowing the starter to move away from the flywheel.

              I think from the weld there is not enough strength to hold the starter under load. I am thinking about drilling out the threads and running a bolt through and then using a washer and nut to provide some strength.

              Any Ideas or thoughts?

              Comment


              • #8
                Re: 4.3lx Broken starter bolt hole

                The bolt hole is too big and or the surface is not flat?
                rebuilding 3 classics
                17 Irvette I/B CC 99%
                20 Shamrock I/B Pilot house. 50%
                28 Slickcraft I/B FB 60%

                Comment


                • #9
                  Re: 4.3lx Broken starter bolt hole

                  Thanks,

                  I do agree bolt hole to big, the surface is flat. I used a angle square and it checked good.

                  Now I am checking while motor is in boat so I could be off I will check again.

                  So any ideas on a fix i.e Larger bolt, Drill out threads and run a bolt with a lock nut and washers all the way through????

                  I was thinking bolt all the way through for the reason that maybe the weld is not strong enough for the torque..

                  This would allow for the bolt to provide strength instead of the threads on the weld???

                  Thoughts?????

                  Comment


                  • #10
                    Re: 4.3lx Broken starter bolt hole

                    I was thinking i have enough room to drop the starter out the bottom.

                    If I used JB weld on a stud and then screwed it up into the mount hole if that will provide a stronger connection??

                    Thoughts??

                    Comment


                    • #11
                      Re: 4.3lx Broken starter bolt hole

                      Originally posted by Aquatron View Post
                      I was thinking i have enough room to drop the starter out the bottom.

                      If I used JB weld on a stud and then screwed it up into the mount hole if that will provide a stronger connection??

                      Thoughts??
                      Nope,.... Won't work.... Gotta be bolts. 'cause of the way the starter goes in, 'n out...

                      Comment


                      • #12
                        Re: 4.3lx Broken starter bolt hole

                        There is just too much pressure caused by the starter. A very good weld "MIGHT" work, but in reality, you need a new block.
                        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.

                        Comment


                        • #13
                          Re: 4.3lx Broken starter bolt hole

                          That's what iam trying to avoid but I think it's going to be the case new block.

                          I have never notice before because I have never had to mess with the starter so much. But does the starter go flush against bell housing or is there a small gap? You need to put your head way back in a really look for it.

                          Comment


                          • #14
                            Re: 4.3lx Broken starter bolt hole

                            Originally posted by Aquatron View Post
                            That's what iam trying to avoid but I think it's going to be the case new block.

                            I have never notice before because I have never had to mess with the starter so much. But does the starter go flush against bell housing or is there a small gap? You need to put your head way back in a really look for it.
                            There is a small gap, they only make contact on the block above the starter.

                            And yes, everyone is trying to avoid pulling the engine and replacing the block. Happens in all of the threads with this problem.
                            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.

                            Comment


                            • #15
                              Sign up today
                              Re: 4.3lx Broken starter bolt hole

                              Thanks again everyone. I have wasted enough of everyone's time along with mine trying to avoid the obvious.

                              Well I have a friend with a 4.3lx Vortec that has a scored cylinder wall going by today to look and see if i can rebuild.

                              The one quick question and then i will start a new thread with new question.

                              I have a 95 Vortec with a 12 bolt intake can i use my heads and intake from my vortec on this other one?

                              The heads on the other motor have the 8 bolt intake.

                              I think i know the answer just wondering if i am correct.

                              Comment

                              Working...
                              X