Block Crack
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Block Crack

  1. #1
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    Default Block Crack

    Hi, Just wanted to know if a Crack in no#2 Main saddle is at all repairable it is straight across the oil passage and goes down the saddle almost 1/4inch, It is a bowtie 184 block, 4 bolt splayed caps, I spun a rod bearing and there was obviously excessive heat, Crank is no good. Just wanted to know if I can salvage this block in anyway. I have tried to attached photos i hope they work and thanks for any infomation.
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  3. #2
    gn7
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    Its toast. The crack is headed to the camshaft tunnel and there is nothing that is going to stop it.
    Its probably the cause of spinning the rod bearing, not the result of it.

    How much power you making with that thing???



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    Only 550hp, Think it may have been like that when I got it, Would it simply not last 5min? Or something that will happen after hours of RPM?

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    gn7
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    Quote Originally Posted by Caribbean17 View Post
    Only 550hp, Think it may have been like that when I got it, Would it simply not last 5min? Or something that will happen after hours of RPM?
    Its not going to hold bearing crush for shit. Its going to spray oil that should be going to the main and more importantly a rod bearing. Its going to worse. Would it last 5 minutes. Maybe. More RPM, the faster it is going to grow.

    If you don't know the history, it was probably already started, no matter how small, when you bought it. 500HP didn't start that crack.



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    Quote Originally Posted by Caribbean17 View Post
    Only 550hp, Think it may have been like that when I got it, Would it simply not last 5min? Or something that will happen after hours of RPM?
    Do you're self a favor and and take it to a good machine shop who can check the depth of the crack and let them tell you if it is junk or not. JMO

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    gn7
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    Quote Originally Posted by ol guy View Post
    Do you're self a favor and and take it to a good machine shop who can check the depth of the crack and let them tell you if it is junk or not. JMO
    Crack depth tends to be a ratio to its width. That thing is cracked the entire width of the main. ITS DEEP! And it isn't going to get any shallower anytime soon. Anybody can roll dice. Smart people don't roll fixed dice.



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    Quote Originally Posted by gn7 View Post
    Crack depth tends to be a ratio to its width. That thing is cracked the entire width of the main. ITS DEEP! And it isn't going to get any shallower anytime soon. Anybody can roll dice. Smart people don't roll fixed dice.
    OK. Where is Uncle Bob. Uncle Bob can't talk that nice. Where is he?????
    No Fool Like A Old Fool is there?

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    Since the block is more or less a paper weight, We have come up with a plan to use it in a Crash and bash car for shits and giggles. From the information im getting (Not here to start arguments) At one point the saddle has had a heavy side impact and the crack while all the way across is not so deep but has fractured at the weakest point being either side of the oil hole. We are going to dill a relief hole at the end of the crack and then V groove the 1/4 inch down and Thermal spray weld it up to height, Re drill the oil galley and get it line bored. We are only doing this because we have all the parts to fill the short block we be funny to see how long it lasts.

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    It's not more or less.....it is a boat anchor, it ain't worth foolin with!!

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    Quote Originally Posted by Caribbean17 View Post
    Since the block is more or less a paper weight, We have come up with a plan to use it in a Crash and bash car for shits and giggles. From the information im getting (Not here to start arguments) At one point the saddle has had a heavy side impact and the crack while all the way across is not so deep but has fractured at the weakest point being either side of the oil hole. We are going to dill a relief hole at the end of the crack and then V groove the 1/4 inch down and Thermal spray weld it up to height, Re drill the oil galley and get it line bored. We are only doing this because we have all the parts to fill the short block we be funny to see how long it lasts.
    Hell, i would try that. Some loctite on the bearing, make sure clearance is a little loose, splayed cap 4 bolt ought to help hold it together. I wouldn't put any high dollar parts in it. All you really need to do is keep the bearing in place so the rods get oil. If the crack opens up a little what will it do, leak a little oil? If you keep an eye on the oil and pressure you should be able to catch it before it goes catastrophic fail. Don't try and make big hp...it might last. Seems like you can get away with a lot of stuff in a car motor that would not last 10 min. in a boat.
    Be a good beginning for a build thread.You could start a "how long will it last' pool and if it lasts 100 hrs without taking a dump you get to keep the money

  13. #11
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    That block has done its time!!!

    What caused the rod bearing to spin ???

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    for a crack to show that clearly on a monitor screen , agree with those saying the block is done . I have stitched and stick welded frost cracks in blocks but wouldn't waste the time with trying to repair a crack in a main bulkhead . unless you've got some new improved spray weld system it doesn't penetrate the parent metal and just lays on top , little or no strength returned to the block .
    Quote Originally Posted by gn7 If your ran a cammer your odds of finishing WERE ZERO.

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    I realise the block is done guys, We are just doing it out of interest, So many thousands of blocks must have been scrapped and it's a pity.
    It's laser cladding (A form of spray weld) that will fill the cut out groove, Rolls royce have been using the technology recently to repair plane engine parts that they previously used to throw away.
    There is a company not far from me that have the laser with 5 axis head and can concentrate the area more than spray weld. Its just for Fun

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    Default block crack

    Just for the funof it?

    I do recall, taking a motor on it's last leg, drain oil and water, open the throttle to about 5,000 and sat back with beers. We were totally suprised in how long it lasted.

    And laughed our asses off the entire time.

    Jerry

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