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Ever had this happen?

  1. #1
    Senior Member whiskeybent hondo's Avatar
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    Default Ever had this happen?

    I picked up an old comp car with a stock GM block & caps, short filled 355 sbc,....forged crank, engle roller, aluminum rods, ross pistons 13-1, old casting brodix heads. Because the car had sat in a trailer for the last twelve years I decided to pull the pan and poke around the bottom end a bit.

    Look what happened when I reinstalled the oil pump last night.....I didn't even have the torque wrench on it yet. This happened with the pump fully seated in the dowles with a 3/8 ratchet just snug....

    The funny part of it is...I fired it up two days before with almost 80 lbs of oil pressure.

    Im glad this happened in the trailer....Imagine this motor bouncing up and down in a circle flat bottom!

    Im officially over stock junk...
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  3. #2
    gn7
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    Quote Originally Posted by whiskeybent hondo View Post
    I picked up an old comp car with a stock GM block & caps, short filled 355 sbc,....forged crank, engle roller, aluminum rods, ross pistons 13-1, old casting brodix heads. Because the car had sat in a trailer for the last twelve years I decided to pull the pan and poke around the bottom end a bit.

    Look what happened when I reinstalled the oil pump last night.....I didn't even have the torque wrench on it yet. This happened with the pump fully seated in the dowles with a 3/8 ratchet just snug....

    The funny part of it is...I fired it up two days before with almost 80 lbs of oil pressure.

    Im glad this happened in the trailer....Imagine this motor bouncing up and down in a circle flat bottom!

    Im officially over stock junk...
    The stock bolts in a sbc are stronger than many think. The main cap bolts are some of the best stock bolts in the industry.
    I venture to bet that bolt wasn't the stock bolt, AND It would be to your benefit to pull that cap and see if the bolt is bottomed out on the bearing.

    Not saying it can't happen



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    Last edited by gn7; 07-16-2012 at 09:52 PM.

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by gn7 View Post
    The stock bolts in a sbc are stronger than many think. The main cap bolts are some of the best stock bolts in the industry.
    I venture to bet that bolt wasn't the stock bolt, AND It would be to your benefit to pull that cap and see if the bolt is bottomed out on the bearing.
    Bingo Bob! Look at the bottom and see the seat for the bolt kinda freshly rubbed. Bolt bottomed out and cracked the main saddle.

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  6. #4
    Senior Member whiskeybent hondo's Avatar
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    Quote Originally Posted by gn7 View Post
    pull that cap and see if the bolt is bottomed out on the bearing.

    Not saying it can't happen, but most bolts don't break mid thread like that.
    im heading out to the trailer to pull the rear main...we shall see

  7. #5
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    Is the bolt broken off in the hole? I don't see that. I see the casting broken. That doesn't "just happen". I know once in a while someone will mistake a short head bolt for an oil pump bolt and they're too short, not enough engagement. This is what typically happens...they either just strip out the threads of the cap, or break the casting.
    Last edited by scott foxwell; 07-16-2012 at 10:15 PM.
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    gn7
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    Quote Originally Posted by steelcomp View Post
    Is the bolt broken off in the hole? I don't see that. I see the casting broken. That doesn't "just happen". I know once in a while someone will mistake a short head bolt for an oil pump bolt and they're too short, not enough engagement. This is what typically happens...they either just strip out the threads of the cap, or break the casting.
    No. I thought it did and then I edited it out. At first thats what I thought he was refering to, then I saw the broken piece from the cap. I agree, a short bolt will do that. Even if the bolt is the correct length now, doesn't mean it always was. Hard to imagine exactly what caused it to bust that piece out of there. But its NOT common.

    Hard to say in the pic, but I think I would dress that with a stone and toss a stud in it.
    Its what I like about studs for oil pumps. You can thread them in and check for max thread ingagement, make sure it isn't into the bearing, lock tite and forget em.



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    Last edited by gn7; 07-16-2012 at 10:33 PM.

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    It looks like there's two more cracks at 7:00 and 9:00. I'd address that before proceeding with a stud. With any luck they can be ground out and not lose the main cap.

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    Quote Originally Posted by steelcomp View Post
    That doesn't "just happen". I know once in a while someone will mistake a short head bolt for an oil pump bolt and they're too short, not enough engagement. This is what typically happens...they either just strip out the threads of the cap, or break the casting.
    Yup I've seen that too... but this motor has studs.

    I agree that doesn't "just happen"......nothing ever does
    Last edited by whiskeybent hondo; 07-16-2012 at 11:35 PM.

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    Senior Member whiskeybent hondo's Avatar
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    ok here we go, more to follow....

    p.s. I know this motor isn't a boat, but IF im right....what if this happens in one?
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  12. #10
    gn7
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    Sorry to put you thru that Whiskeybent. What I meant was to look at the back side of the bearing and see if the bolt had bottom out on it. But I see that the problem is different than I originally saw it. I have to go with Steel on this. My hunch is that the pump was bolted down at some point with too short of a bolt and fratured the cap. Its still a guess, but that is not a usual problem.

    What do you if thaty happened in a boat. I have had 2 iron pumps break in 2 in the oast. I gave up on iron pumps years ago.



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  13. #11
    Senior Member whiskeybent hondo's Avatar
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    GN your right I don't think this is the stock bolt. But Im not convinced it was the cause.
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  14. #12
    gn7
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    Its Home Depot grade 5 bolt. It has no business holding on an oil pump in anything. A hardware store socket head allen would be better suited, although I am not recommending that.

    Is the "shiney" area on the end of the threads the ONLY pplace the bolt was ingaged into the cap threads? If so, you just found your problem.
    Any bolt you replace it with, run it in byu hand with the oil pump in place with the capn off and the bearing out, and verify that the bolt has max thread purchase but does not protrude into the bearing saddle.

    better double check that cap for any additional cracks first. In the pic it looks like there are others, but it just a pic.



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    Last edited by gn7; 07-17-2012 at 12:02 AM.

  15. #13
    Senior Member whiskeybent hondo's Avatar
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    I know... I know....cheapy harbor freight specials..plus or minus a mile
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  16. #14
    gn7
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    Quote Originally Posted by whiskeybent hondo View Post
    I know... I know....cheapy harbor freight specials..plus or minus a mile
    Put the bolt in the pump and see how much thread is sticking thru to engage the cap. And remember, the threads in the cap start about a 1/4 below the bottom of the pump body.



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    Last edited by gn7; 07-17-2012 at 12:15 AM.

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