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  1. #1
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    Default Motor mount lag bolts pulled out!!! PICS ADDED

    Had a slight mishap and the front motor mount bolts pulled up outta the stringers.. It didnt hurt the stringers at all just pulled the bolts out.. How would I go about repairing the bolt holes to hold bolts again?
    Last edited by v8power; July 11th, 2010 at 11:36 PM. Reason: pics added
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  2. #2
    Moderator Bob_VT's Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    Epoxy. Drill the holes larger to fresh wood and fill with epoxy then re-drill pilot holes for the lag bolts.
    This is a great link to boat specifications http://boatspecs.iboats.com/
    Please, shop iboats first!!


  3. #3
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    Default Re: Motor mount lag bolts pulled out!!!

    what kind of epoxy would you suggest?
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  4. #4
    Moderator Bob_VT's Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    West systems.
    This is a great link to boat specifications http://boatspecs.iboats.com/
    Please, shop iboats first!!


  5. #5
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    Default Re: Motor mount lag bolts pulled out!!!

    ok thank you.
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  6. #6
    Moderator Bob_VT's Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    If you drill the holes larger....... mix the epoxy inside a gallon zip lock bag and then do what a pastry chef does and cut a corner of the bag open...... it will give you some accuracy when shooting it into a hole.
    This is a great link to boat specifications http://boatspecs.iboats.com/
    Please, shop iboats first!!


  7. #7
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    Default Re: Motor mount lag bolts pulled out!!!

    I was looking at the west system website and I dont know which epoxy to get. Any suggestions?
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  8. #8
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    Default Re: Motor mount lag bolts pulled out!!!

    ??????
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  9. #9
    Senior Chief Petty Officer jspano's Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    iboats sells west system 105 epoxy
    Joe


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  10. #10
    Moderator Bob_VT's Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    Yes 105 would be my choice.
    This is a great link to boat specifications http://boatspecs.iboats.com/
    Please, shop iboats first!!


  11. #11
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    Default Re: Motor mount lag bolts pulled out!!!

    thanks fellas I really appreciate it..
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  12. #12
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    Default Re: Motor mount lag bolts pulled out!!!

    Ok, So what filler and hardener should I use? I also have a couple small spots on the bottom of the hull that need repaired from when the boat hit the ground. The worst spot is about 4 inches long by 3 inches wide and about a 1/4 of an inch deep. Can I use the same epoxy/filler combo on this to or do I need to use fiber mat/cloth?
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  13. #13
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    Default Re: Motor mount lag bolts pulled out!!!

    ????
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  14. #14
    Vice Admiral Yacht Dr.'s Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    Quote Originally Posted by v8power View Post
    Ok, So what filler and hardener should I use? I also have a couple small spots on the bottom of the hull that need repaired from when the boat hit the ground. The worst spot is about 4 inches long by 3 inches wide and about a 1/4 of an inch deep. Can I use the same epoxy/filler combo on this to or do I need to use fiber mat/cloth?
    Hello m8..

    Erm..small spot...cough.. thats considerd a hole m8 ( 4"x3"x1/4" deep ? ).

    Pics please.

    YD.

  15. #15
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    Default Motor mount box replacement question.

    Ok, so the lag screws pulled up outta the motor mount boxes due to an accident on the highway. I pulled the engine today and thought all I was going to have to do was drill the existing holes and epoxy dowels in them to hold new lag screws. Well, once the engine was out and upon further inspection, I found that the port side mount box is broke loose from the hull. I cut the fiberglass around the box and removed it. I went to a wood working shop today and baught the epoxy for doing the dowel job, and I am wondering if I can use this same epoxy to re-adhere a new motor mount box to the hull. The guy at the store sold me west sytems g-5 epoxy adhesive.. Will this work or do I need to take it back and get the 105 epoxy...

    This is turning out to be a bigger nightmare than I thought..


    Thanks
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  16. #16
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    Default Re: Motor mount box replacement question.

    Anyone?
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  17. #17
    Supreme Mariner Woodonglass's Avatar
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    Default Re: Motor mount box replacement question.

    some pics of what you are dealing with would be helpful. We cannot SEE your problem like You can. I suspect that the Expoxy will be fine BUT you will probably need to do some grinding and also use some glass cloth for added strenght. Picture is worth a thousand words doncha know

  18. #18
    Moderator Bob_VT's Avatar
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    Default Re: Motor mount box replacement question.

    Merged your threads...... not quite sure about the G 5 and still would use 105

    I read this and decided that G 5 IS NOT what you want
    " Not recommended for long-term bonds subject to high loads or moisture. " I read that here on the west system site http://www.westsystem.com/ss/g5/
    This is a great link to boat specifications http://boatspecs.iboats.com/
    Please, shop iboats first!!


  19. #19
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    Default Re: Motor mount lag bolts pulled out!!!

    Ok, thanks. Its just a 50 mile drive to the shop that has the epoxy and I really didnt want to have to go there again, but I really would rather not have to pull the motor again to do it right. So, I guess I will have to drive over there and exchange the g-5 for the 105..
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  20. #20
    Supreme Mariner Woodonglass's Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    I still say if the box has pulled away from the hull and you said your self and I quote "I cut the fiberglass around the box and removed it." You need to re-glass the box back into the hull. Epoxy by itself will NOT be enough to hold it. Epoxy by itself is NOT structural. With out glass, when it hardens it is VERY BRITTLE and fractures very easily. It NEEDS to be re-Glassed.

    I'm just sayin...


  21. #21
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    Default Re: Motor mount lag bolts pulled out!!!

    yea, im planning on re glassing the box to the hull after i re epoxy it to the hull.. now the next question is, can I use the 105 epoxy on the glass mat/cloth or should I use something else? I will try to post some pics of the project later this evening... Ive used fiberglass repair kits on metal and wood before but I am still kind of new to doing repairs like this..
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  22. #22
    Moderator Bob_VT's Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    105 epoxy resin is used with fiberglass cloth the same way polyester resin id used. The best part is ...... working with epoxy gives far more working time but results in a stronger repair. Use it the same way you use a fiberglass kit but with one exception....

    Be very careful to mix it to the proper ratio.
    This is a great link to boat specifications http://boatspecs.iboats.com/
    Please, shop iboats first!!


  23. #23
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    Default Re: Motor mount lag bolts pulled out!!!

    Yea, im gonna buy the pumps and all the stuff needed to do it right.. the original epoxy almost looks like bondo filler, its like a redish orange color and bondo like..anyways im going out to the garage now to take some pics...
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

  24. #24
    Fleet Admiral Mark42's Avatar
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    Default Re: Motor mount lag bolts pulled out!!!

    Quote Originally Posted by v8power View Post
    Had a slight mishap and the front motor mount bolts pulled up outta the stringers.. It didnt hurt the stringers at all just pulled the bolts out.. How would I go about repairing the bolt holes to hold bolts again?
    Ummmmm......Exactly what sort of "slight mishap" causes the bolts that hold down 400+ lbs of motor to rip out of their mounts?

    Inquiring minds want to know!
    1985 Bayliner 1600 Capri Cuddy, 1965 MFG Niagara Custom. >> MFG Video<<. >> MFG Project<< >>Bayliner Hard Top Project<< >>Bayliner Repower Project<<


  25. #25
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    Default Re: Motor mount lag bolts pulled out!!!

    Well, Im an idiot. Rather than scuff some vinyl on my stern I just figured i'd drive like I was towing a boat, and not put on the stern straps. Well, last weekend, I tried (again, Im an idiot) to avoid a big a** deer on the highway, and lost controll of the trailer and after about 5 or 6 times across 2 lanes of highway, the boat came off the trailer, the impact on the starboard side was great enough to break the transom plate and pull the lag screws and the port mount box loose. So, i learned the hard and heart breaking reason why stern straps are so important. Im just glad I tore up the boat only and didnt crash the car, or hurt anyone else besides my own pride. U can bet your a** that It will have stern straps next time if I have to put new eyelets below the swim deck on the stern.
    1980 Cobalt 19CD, 5.7l v-8 260 hp, MC-1

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