Rusted elbow bolts

TickledPinkTickledPink Posts: 127 ✭✭
in Engine Discussions
I'm replacing the exhaust manifolds, risers, elbows etc. on my 5.0L MPI and am stuck before I start. The elbow bolts on the top are all rusted shut and only one will turn.
Any tips for loosening them would be very much appreciated. 
Thanks very much.
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Comments

  • aero3113aero3113 Posts: 9,799 ✭✭✭✭✭
    Are you just using a wrench or ratchet? Try using an impact gun. You need the shock to loosen up the bolt. My impact gun is my favorite tool. It helped me tremendously with my FJ40 when I was pulling it apart. You have a good chance of snapping the bolt if you don’t use one.
    2008 330EC
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  • TickledPinkTickledPink Posts: 127 ✭✭
    Thanks @aero3113 I shall invest on one.
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  • aero3113aero3113 Posts: 9,799 ✭✭✭✭✭
    Harbor freight has some reasonable ones that work really well, compact also. I have their Bauer impact gun.
    2008 330EC
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  • PickleRickPickleRick Posts: 4,351 ✭✭✭✭✭
    Find your favorite penetrating fluid and let it soak a few days.  

    Start the boat up and let it get to normal running temp, or as close as possible.  

    Try to pop them while warm. 

    Good luck....always a slim chance of breaking the the head off the bolt


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  • Rich_Rich_ Posts: 339 ✭✭✭
    Kano AeroKroil
    Amazon https://a.co/d/07bOSwC7 and now even at some auto parts stores
    Rinker sold but still have other boats        Eastern LI, NY
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  • aero3113aero3113 Posts: 9,799 ✭✭✭✭✭
    Aerokroil is great stuff.
    2008 330EC
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  • raybo3raybo3 Posts: 5,614 admin
    @aero3113 yeah its great stuff because your name is in it.......LOL
    2002 342 Fiesta Vee PC Point Of Pines YC Revere MA. popyc.org     raybo3@live.com
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  • aero3113aero3113 Posts: 9,799 ✭✭✭✭✭
    😂
    2008 330EC
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  • TickledPinkTickledPink Posts: 127 ✭✭
    Sadly I can't always get all the stuff you guys use as I'm on the Isle of Wight off the south coast of England.
    However, I have soaked them with penetrating oil and have bought an impact wrench so fingers crossed, the bolts will be nice to me. I'm going to work on them over the weekend.
    Thanks for all your help.
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  • PickleRickPickleRick Posts: 4,351 ✭✭✭✭✭
    In a pinch one can melt crayons to assist with the removal of rusty hardware
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  • WillhoundWillhound Posts: 4,241 ✭✭✭✭✭
    PickleRick said:
    In a pinch one can melt crayons to assist with the removal of rusty hardware
    Ok, in all my years of fixing things, this is new to me. Does the melted wax wick its way into the threads to lubricate them ?
    "Knot Quite Shore" - 2000 FV270 (Sold)
    2018 Cherokee 39RL Land Yacht (Sorry...)
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  • Rich_Rich_ Posts: 339 ✭✭✭
    That is the theory, but Kroil works better 
    Rinker sold but still have other boats        Eastern LI, NY
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  • PickleRickPickleRick Posts: 4,351 ✭✭✭✭✭
    Willhound said:
    PickleRick said:
    In a pinch one can melt crayons to assist with the removal of rusty hardware
    Ok, in all my years of fixing things, this is new to me. Does the melted wax wick its way into the threads to lubricate them ?
    It does.  Obviously there are better ways but it works in a pinch, especially if its in a recess where it won't run off
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  • captkevincaptkevin Posts: 559 ✭✭✭
    Kroil is great stuff 
    2004 232
    2021 Yamaha Fx svho
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  • PickleRickPickleRick Posts: 4,351 ✭✭✭✭✭
    edited August 28
    The advantage of a wax as penetrating lube vs your usual hardware store or automotive section penetrating lube is how it acts when heated.  Most can lubes evaporate when heated, usually quickly.   Wax will continue to wick its way into the threads as the engine runs. 

       
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  • rasburyrasbury Posts: 8,952 ✭✭✭✭✭
    Make sure you have no gas fumes as you are melting wax! Just because they bolt heads have rust on them i don't always see a problem with the threads...
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  • TickledPinkTickledPink Posts: 127 ✭✭
    I've managed to get 5 of the 8 undone so far. The others are not playing nice. I'm determined though.
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