Unhappy sound in engine |
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Unhappy sound in engine |
vw_porsche |
Apr 28 2014, 11:44 PM
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#1
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Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
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? |
cwpeden |
Apr 29 2014, 12:12 AM
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#2
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Great White North, huh? Group: Members Posts: 916 Joined: 20-August 06 From: Victoria BC Member No.: 6,693 Region Association: Canada |
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 |
Apr 29 2014, 08:25 AM
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#3
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Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
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yeahmag |
Apr 29 2014, 11:45 AM
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#4
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
Can you see if the piston is missing a chunk? That looks like aluminum to me.
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stugray |
Apr 29 2014, 12:15 PM
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#5
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
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? |
vw_porsche |
Apr 29 2014, 12:17 PM
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#6
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Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
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vw_porsche |
Apr 29 2014, 12:20 PM
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#7
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Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
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. |
yeahmag |
Apr 29 2014, 12:21 PM
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#8
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
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 |
Apr 29 2014, 12:40 PM
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#9
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Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
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Cupomeat |
Apr 29 2014, 12:42 PM
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#10
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missing my NY 914 in VA Group: Members Posts: 1,336 Joined: 26-November 07 From: Oakton VA Member No.: 8,376 Region Association: MidAtlantic Region |
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yeahmag |
Apr 29 2014, 02:36 PM
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#11
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
I think you need to look above that. Were you running carbs or the stock FI?
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TheCabinetmaker |
Apr 29 2014, 02:52 PM
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#12
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I drive my car everyday Group: Members Posts: 8,301 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Those got ingested thru the carbs. No way they were spit out of the valve.
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vw_porsche |
Apr 29 2014, 03:28 PM
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#13
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Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
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. |
yeahmag |
Apr 29 2014, 03:47 PM
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#14
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
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 |
Apr 29 2014, 06:36 PM
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#15
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Custom Member Group: Members Posts: 24,585 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Bummer....
Time for a boroscope from Home Depot... |
Elliot Cannon |
Apr 29 2014, 06:44 PM
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#16
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None |
Shanghai Tool Supply. (IMG:style_emoticons/default/biggrin.gif) http://www.harborfreight.com/Digital-Inspe...iNzc0NyJ9%0D%0A
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yeahmag |
Apr 29 2014, 06:54 PM
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#17
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
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 |
Apr 29 2014, 07:15 PM
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#18
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
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. |
r_towle |
Apr 29 2014, 07:15 PM
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#19
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Custom Member Group: Members Posts: 24,585 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
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vw_porsche |
Apr 29 2014, 07:20 PM
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#20
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Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
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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