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> Unhappy sound in engine
vw_porsche
post Apr 28 2014, 11:44 PM
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So, I was taking the long way home last Tuesday night after work. After about 15 minuets I got on the interstate and got up to around 75 when all of a sudden a loud knocking started.
I thought at the time that it sounded like a nut or bold fell into the combustion chamber somehow.
It sounded like a piston beating something up.
After a few seconds the sound quieted down a bit. By this time I knew the damage was already done. So, I "limped" it home.
I was finally able to pull the engine today and this is what I found...
Now, I am not missing any nuts or bolts from my ventures, or studs from my intake.
I had my air cleaners on with the rain hat covers on my 40 idf webers.
And spark plugs are damaged, but complete.
It looks like a stud or bold.
Any ideas where this could have come from?

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cwpeden
post Apr 29 2014, 12:12 AM
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Definitely looks like the remnants of a stud or several... about the right size for the studs to hold your rainhats on?
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vw_porsche
post Apr 29 2014, 08:25 AM
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QUOTE(cwpeden @ Apr 29 2014, 01:12 AM) *

Definitely looks like the remnants of a stud or several... about the right size for the studs to hold your rainhats on?


I checked all studs, nuts, and bolts. All are accounted for.
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yeahmag
post Apr 29 2014, 11:45 AM
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Can you see if the piston is missing a chunk? That looks like aluminum to me.
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stugray
post Apr 29 2014, 12:15 PM
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Please explain how those pieces got "munched" and then spit out THE INTAKE valve....
If you had found them in the headers, then that's expected... (Have you looked in the header yet?)

You say you pulled the engine, but have you pulled the head yet?
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vw_porsche
post Apr 29 2014, 12:17 PM
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QUOTE(yeahmag @ Apr 29 2014, 12:45 PM) *

Can you see if the piston is missing a chunk? That looks like aluminum to me.


The pieces are metal.
I used a magnet to get them out.
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vw_porsche
post Apr 29 2014, 12:20 PM
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QUOTE(stugray @ Apr 29 2014, 01:15 PM) *

Please explain how those pieces got "munched" and then spit out THE INTAKE valve....
If you had found them in the headers, then that's expected... (Have you looked in the header yet?)

You say you pulled the engine, but have you pulled the head yet?


That's what I'm wondering too.
I didn't find anything in the header.
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yeahmag
post Apr 29 2014, 12:21 PM
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Man... Being ferrous and in the intake like that I can't see how it couldn't come from ABOVE the valve. Really look over all the intake parts again.
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vw_porsche
post Apr 29 2014, 12:40 PM
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QUOTE(yeahmag @ Apr 29 2014, 01:21 PM) *

Man... Being ferrous and in the intake like that I can't see how it couldn't come from ABOVE the valve. Really look over all the intake parts again.


See anything I may have missed?

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Cupomeat
post Apr 29 2014, 12:42 PM
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QUOTE(vw_porsche @ Apr 29 2014, 02:40 PM) *

QUOTE(yeahmag @ Apr 29 2014, 01:21 PM) *

Man... Being ferrous and in the intake like that I can't see how it couldn't come from ABOVE the valve. Really look over all the intake parts again.


See anything I may have missed?

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Nothing looks out of place there...
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yeahmag
post Apr 29 2014, 02:36 PM
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I think you need to look above that. Were you running carbs or the stock FI?
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TheCabinetmaker
post Apr 29 2014, 02:52 PM
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Those got ingested thru the carbs. No way they were spit out of the valve.
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vw_porsche
post Apr 29 2014, 03:28 PM
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QUOTE(yeahmag @ Apr 29 2014, 03:36 PM) *

I think you need to look above that. Were you running carbs or the stock FI?


I have 40 idf webers, with air cleaners and rain hats on top.
I would think it is impossible for something like this to get past the air cleaners.
All of the retaining bolts that hold the air cleaner and velocity stacks on are accounted for.
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yeahmag
post Apr 29 2014, 03:47 PM
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I would inspect the carbs and intake manifolds carefully. I'd be pretty surprised if you didn't find something missing.
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r_towle
post Apr 29 2014, 06:36 PM
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Bummer....

Time for a boroscope from Home Depot...
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Elliot Cannon
post Apr 29 2014, 06:44 PM
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Shanghai Tool Supply. (IMG:style_emoticons/default/biggrin.gif) http://www.harborfreight.com/Digital-Inspe...iNzc0NyJ9%0D%0A
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yeahmag
post Apr 29 2014, 06:54 PM
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I personally don't see the need for a borescope. That has to come off and the valve seats redone anyway. You'll get a good look at the piston then.
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stugray
post Apr 29 2014, 07:15 PM
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How about the screws that hold the butterfly valve in place?
Looks like too much material, but worth a shot.

Other explanation could be some piece that had been left inside somewhere and just now got knocked loose.
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r_towle
post Apr 29 2014, 07:15 PM
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QUOTE(yeahmag @ Apr 29 2014, 08:54 PM) *

I personally don't see the need for a borescope. That has to come off and the valve seats redone anyway. You'll get a good look at the piston then.

It's a perfectly good reason to go to the tool store and buy a new tool.

WTF is wrong with you?
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vw_porsche
post Apr 29 2014, 07:20 PM
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QUOTE(stugray @ Apr 29 2014, 08:15 PM) *

How about the screws that hold the butterfly valve in place?
Looks like too much material, but worth a shot.

Other explanation could be some piece that had been left inside somewhere and just now got knocked loose.


I checked the butterfly screws too.

I have 3500+ miles since rebuild. Odd it waiting so long to come loose.
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