Damn it.........
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Damn it.........

  1. #1
    Senior Member River Dad's Avatar
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    Default Damn it.........

    Two hours on a 4 bolt 468", steel crank, HD I beam rods with ARP bolts, Kieth black 9.5:1 pistons. Seemed to lock up so we pulled it down and THREE rod bolts had loosened up. #8 was bad enough to allow the cap to lift and the bearing to spin.

    I guess a stretch gauge is in my future.. I have always just torqued to spec and never had a problem. Anybody else have this happen? It sure didn't take long, and it happened when the motor was idling. The good news is the cam broke in fine and everything else looks perfect. I guess I pull it apart, grind the crank, and put it all back together. Just sucks to have a brand new piece do this, but I guess it could have been much much worse. I always heard guys talking about the stretch gauge being the only way to go and I guess now I'm a believer too..... River Dad

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    steelcomp was here
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    Sounds like someone forgot to tighten some bolts. (Well someone was going to say it, might as well be me!)
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by steelcomp View Post
    Sounds like someone forgot to tighten some bolts. (Well someone was going to say it, might as well be me!)
    X2, been there done that!

    Have the T-shirt too

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by steelcomp View Post
    Sounds like someone forgot to tighten some bolts. (Well someone was going to say it, might as well be me!)
    I go thru those about 3 or 4 times, rechecking the torque, just to reduce my self-paranoia that I missed one, before I put the pan on. Mains too.

    Easy to miss just one, or more.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    The rest of us are being dragged along kicking and screaming.

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    Member bennyb's Avatar
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    Been lucky so far. My son , daughters so and myself went through the last engine a few times
    20'5 Advantage classic cruiser
    Go on get your ass outa here

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    Super Moderator HammerDown's Avatar
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    I used ARP's when I reconditioned the GM rods on my 468...never used a stretch gauge. Sure you didn't miss a few?
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member Morg's Avatar
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    Quote Originally Posted by steelcomp View Post
    Sounds like someone forgot to tighten some bolts. (Well someone was going to say it, might as well be me!)
    Hey, we agree on something.

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by Morg View Post
    Hey, we agree on something.
    Holy smokes!! There is a first time for everything. lmao
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    steelcomp was here
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    Quote Originally Posted by Morg View Post
    Hey, we agree on something.
    No we don't.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member Morg's Avatar
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    LOL, you are just to much Steel,

    Go ahead........

    Don't worry I won't come back & make this into a bickering fest that Rex needs to oversee.

    Mr. Steel you have the floor.

    Carry on.
    Last edited by Morg; 09-30-2008 at 07:42 AM. Reason: lack of spelling skills

  13. #11
    Senior Member Morg's Avatar
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    Quote Originally Posted by River Dad View Post
    Two hours on a 4 bolt 468", steel crank, HD I beam rods with ARP bolts, Kieth black 9.5:1 pistons. Seemed to lock up so we pulled it down and THREE rod bolts had loosened up. #8 was bad enough to allow the cap to lift and the bearing to spin.

    I guess a stretch gauge is in my future.. I have always just torqued to spec and never had a problem. Anybody else have this happen? It sure didn't take long, and it happened when the motor was idling. The good news is the cam broke in fine and everything else looks perfect. I guess I pull it apart, grind the crank, and put it all back together. Just sucks to have a brand new piece do this, but I guess it could have been much much worse. I always heard guys talking about the stretch gauge being the only way to go and I guess now I'm a believer too..... River Dad
    River Dad,

    Sorry to bring elements of the past to your thread. Not the intent.

    I hope you find some answers in hear to figure out what happened & try to avoid in the future.

    There is a huge wealth of knowledge on these boards. So much that it has caused some issues in the past.

    Good luck.

  14. #12
    Distinguished Member David 519's Avatar
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    Quote Originally Posted by River Dad View Post
    Two hours on a 4 bolt 468", steel crank, HD I beam rods with ARP bolts, Kieth black 9.5:1 pistons. Seemed to lock up so we pulled it down and THREE rod bolts had loosened up. #8 was bad enough to allow the cap to lift and the bearing to spin.

    I guess a stretch gauge is in my future.. I have always just torqued to spec and never had a problem. Anybody else have this happen? It sure didn't take long, and it happened when the motor was idling. The good news is the cam broke in fine and everything else looks perfect. I guess I pull it apart, grind the crank, and put it all back together. Just sucks to have a brand new piece do this, but I guess it could have been much much worse. I always heard guys talking about the stretch gauge being the only way to go and I guess now I'm a believer too..... River Dad
    Just be glad it happened when the engine was idleing and not at a 1000' into a 1320' pass like someone else I know... The damage in those circumstances are much more severe...
    Best of luck to you

  15. #13
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    Well I can relate, been there done that..........But, the info I got here, (or HB, it was a long time ago) was that the ARPs, or any aftermarket fastener, needs to be exercised into the first use. Torqued, loosened, torqued..like 4 or 5 times to "seat" the threads, then finally torqued.........Also, those bolts should be carefully measured, (mic'd) for length and recorded before they're used, then re measured after disassembly to see if they have stretched beyond re use. I think the specs say if they have stretched .001 or .002 during use, do not reuse them. Any chance the bearings were mis boxed? Did you measure clearance on each rod bearing during assembly? How are the mains?.........AND, what is the history of the rods?......New, used ? Were the rods re sized after the ARPs were installed?..........I have seen a lot of parts and pieces for sale, very reasonable, that state "dyno time" only.......IF those rods were new, and the bolts in them were new, it would seem there were other issues. Rod bolts don't just "loosen up"..........Are the pistons Hypers? The top ring gap is critical IF they're Hypers...........Hope you sort it out, I know that "Mysteries" are a bitch........Ray
    LOUD BOATS SAVE LIVES

  16. #14
    Amm
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    Quote Originally Posted by River Dad View Post
    Two hours on a 4 bolt 468", steel crank, HD I beam rods with ARP bolts, Kieth black 9.5:1 pistons. Seemed to lock up so we pulled it down and THREE rod bolts had loosened up. #8 was bad enough to allow the cap to lift and the bearing to spin.

    I guess a stretch gauge is in my future.. I have always just torqued to spec and never had a problem. Anybody else have this happen? It sure didn't take long, and it happened when the motor was idling. The good news is the cam broke in fine and everything else looks perfect. I guess I pull it apart, grind the crank, and put it all back together. Just sucks to have a brand new piece do this, but I guess it could have been much much worse. I always heard guys talking about the stretch gauge being the only way to go and I guess now I'm a believer too..... River Dad
    My father has described something to me he calls "cold flow". You tighten up a bolt or nut or whatever and the metal takes a minute to settle and that settling can leave the bolt somewhat loose. So he always said to torque, wait a minute and retorque again and a third time if you are paranoid.

    Post Edit: Looks like Moneypit decribed something similiar.

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