I think I dropped a 1/2" nut into my intake manifold - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-22-2010, 09:42 PM
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It ran for about 10 seconds and it sounded pretty bad. I dont know if it would sound that bad unless it made it into the pison chamber. I figure I will pull the heads and take a look.

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Old 06-23-2010, 10:30 AM
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Don't give in to a little nut

My point yesterday was to keep your chin up. Your working on a pretty basic engine. No one really knows how major or minor the damage could be with out removing the heads. You kept the cad for 6 years, it must be worth the time and trouble to repair. You know what you got and whats been done to it. Why start over? Even if you don't keep it, you may want to rebuild it for the experience and knowledge.
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Old 06-23-2010, 10:52 AM
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Thanks for the encouragement spokes
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Old 06-23-2010, 11:17 AM
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Heh, seems like every forum I'm on someone is dropping something in their engine... Actually, you're the only one that didn't do it in a high $$$ race engine, so as far as that goes you're kind of lucky (one left an allen key on top of his new dominator carb...).

The fact is if it made it to the valve you have no good way of confirming what damage it did without disassembling it. Even if you find it sitting on top of the valve, that doesn't mean that it didn't bounce around in there and bend the valve... and you wouldn't know without taking the heads off or putting the intake back on and starting it to check it (and then might end up doing it all over again).

Good luck with it, a friend of mine had the misfortune of dropping a bolt in his running engine and it managed to bounce around and mess up 3 cylinders in one bank... I didn't think it was possible till I drove over there and checked it out myself.
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Old 06-24-2010, 01:14 AM
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I went ahead and pulled the intake manifold tonight,but could not find my magnet. I was fishing around lightly with another tool and I think I felt it, but was unable to retrieve it. If I can retrieve the nut, what is the liklihood that there is no damage. I mean if I were to pull the nut out, and reassemble would should it be good or should I still pull the heads?

Thanks everyone
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Old 06-24-2010, 02:57 AM
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If the nut never made it into the cylinder, and you can pull it from the valve pocket, you could try pulling all the plugs out and do a compression test. If compression is pretty much the same across the board, it would be safe to say the valve/seat where you found the nut isn't damaged. If you want to go a step further, you could do a leak-down test for that cyl., and compare it to the others. If everything shows it's ok, you'll save yourself the trouble of pulling the heads. Hope everything turns out ok.
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Old 06-24-2010, 09:22 AM
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who knows ?

I have heard of a nut or washer moving fron one cylinder to another. My shop teacher said they pulled both heads and found damage in two cylinders. On my brother's engine there was just a small dent in the piston top. when I pulled the engine down a year later and looked under neath the crack was easily visible.
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Old 06-24-2010, 01:23 PM
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Quote:
Originally Posted by timothale
I have heard of a nut or washer moving fron one cylinder to another. My shop teacher said they pulled both heads and found damage in two cylinders. On my brother's engine there was just a small dent in the piston top. when I pulled the engine down a year later and looked under neath the crack was easily visible.
Yep, I once switched fom a 4 hole intake spacer to a open spacer. Just lifted the carb upand switched them real quick. I made it about a mile when one of the center baseplate screws backed out. I heard a metallic rattle and shut it down. Called for a tow home. I then called my buddy, he said start it up. I did and nothing, sounded perfect. I gave it a little gas and the mettalic rattle came back. Then nothing. Give it a little more gas and it came back. That was the third cylinder I f'd up. What would happen is the valve would chop the bolt in half, one half would go into the cylinder, the other would shoot back up into the manifold untill I gave it enough gas to do it over again.
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Old 06-24-2010, 03:47 PM
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Steve,

I think supersport is on the right track.

If you can remove the nut from the head, you will want to check for what might be damaged. A compression test and a leak down test will tell you for sure.

But, before you run those tests, I would start with a visual inspection. Pull your plugs and turn the engine over by hand. Check that all of your intake valves are opening and closing, look for any excess lash, valves that don't want to open, or valve stems that wiggle (bent valve stem). If you can put light into the cylinder at the spark plug holes, look to see if any light is shining up through the intake valves when they are closed. If you can see light, then either the valves are bent or the seat is damaged.

Good luck
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Old 06-24-2010, 11:45 PM
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Spent about 30 minutes fishing around in the valve openings and got nothing, I guess it is time to put on the big boy pants and pull the heads
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