welp...still needs work, need some help on this one.
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welp...still needs work, need some help on this one.

  1. #1
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    Default welp...still needs work, need some help on this one.

    I got the boat back on the water today. Got the timing set and it was running freakin' awesome...


    But then I noticed it was running really hot, so I figure, maybe it needs to be driven. So I get her out. She was slower out of the hole then it should be, and then it as only turning 5000 RPM (A/B impeller, 496 BBC roller cam, OT headers, big valve head 10.5:1 CR, tunnel ram, dual holley 600's VS). Now, this is going to be very hard to describe, but I"ll try

    Then, I started hearing this awful noise, it sounded like a metal on metal tap, (almost like a loose rocker or something) but it was a hollow tap, and was coming from the top, like by the carbs; it was also sporadic, but still increased with throttle. The water was like 215 F, we had to idle back into the ramp. And there is water in the oil now, not a ton, but its milky.

    So I'll tell you what I deduce before even tearing into anything. I think its intake gaskets, and that popping noise is the hot boiling water coming up through the intake manifold...and the gaskets being the cause of it running so hot.

    What say you?!

    Thanks!!

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  3. #2
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    I'm gonna pull the valve covers off just to verify it wasn't a rocker (i'm pretty sure its not) and I'm also going to try to do a compression test.

  4. #3
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    Start tearing it down until you find the problem. any idea why it got hot? You`re really going to see a mess under the valve covers. getting hot, water in the oil and then a knock. hate to sound like the grim reaper but i think you`re about to experience buying some new parts and a total rebuild. i hope i`m wrong and i wish you good luck. post what you find.

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  6. #4
    Blown, OHBA Member Wild Hair's Avatar
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    Broken rocker or stud on exhaust, excess cylinder pressure poped head gasket at water jacket, Just a guess hope it's nothing real nasty.
    Last edited by Wild Hair; 08-22-2011 at 03:13 AM.
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  7. #5
    Member hollbrow's Avatar
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    Default Hmmm...

    Sticking valve/collapsed lifter maybe?

  8. #6
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    well, I took the valve covers off, the rocker to the exhaust valve on #8 was barely hanging on. I also found some other loose rockers.

    So I'm assuming that cylinder pressure blew the head gasket. But nothing looked broken, and the pushrod wasn't even bent, so I think it shouldn't be that big of a deal to fix...Kinda excited it ran that good with loose rockers and a blown head gasket

    anyone know the rocker arm tightening specs?

  9. #7
    Senior Member DuaneHTP's Avatar
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    You might try setting the lifters and runninig a compression test. It's possible that is all that is wrong with it. They will put water in the oil someitmes when an exhaust rocker is off.
    Duane HTP

  10. #8
    Senior Member motomattox's Avatar
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    What type of lifters? If hydraulic, then I go 1/4 turn past 0 lash. I would recommend replacing all the rocker nuts with new ones. It is fairly common if they have been re-used more than once that this can happen. And I agree about the water could have come from this. Seen it first hand. Doesn't explain why it got hot though...curious about that one. Good luck with it, hope it works out easily.
    "Keep talking...it aint often I get to hear a genius speak"

  11. #9
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    Thanks for the tips guys.

    I'll look into rocker nuts, they are hydraulic lifters. Can I order those from Jegs or something? They are Crane Gold Roller Rockers.

    Thanks!

  12. #10
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    so to verify

    I should go to top dead center, compression stroke, on each cylinder, and tighten the lifters until I can't freely spin the pushrod through my fingers anymore, then another 1/4 turn?

  13. #11
    Senior Member Widetrack's Avatar
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    Quote Originally Posted by PowerAddict View Post
    Thanks for the tips guys.

    I'll look into rocker nuts, they are hydraulic lifters. Can I order those from Jegs or something? They are Crane Gold Roller Rockers.

    Thanks!
    Do you have stud girdles? This is a good time to buy some if you don't! Peace of mind and you get polylock nuts for the rockers!
    Setting hydraulic lifters is not hard! There is a simple way I will see if I can find the info. and post it for ya! That way you don't get confused with my wording!

    Here ya go! http://www.centuryperformance.com/ad...h-spg-149.html
    Last edited by Widetrack; 08-24-2011 at 10:06 AM.


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  14. #12
    Member hollbrow's Avatar
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    Default Check-

    Check to see what the lifter manufacturer says about the lifters and preload adjustment. Comp Cams has some "minimum preload" hydraulic lifters that take less than 1/16 turn past zero lash to correctly set the preload- you can try and set them by the "1/4 - 1/2" turn method and screw some stuff up- like I did.

  15. #13
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    I'm wondering if they were set wrong before....

    Turns out the poly lock was broken on the #8 ex valve. As I was going to set lash, I started to tighten down some that were loose, and SNAP! Two more were cracked, and are now broken. What would cause this?

  16. #14
    Member hollbrow's Avatar
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    Default Pics?

    Wow- that's freaky. How exactly are the poly-locks broken- have you got any pics of it?
    Last edited by hollbrow; 08-30-2011 at 01:59 PM.

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