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in the last picture there is obviously a valve missing, if that was the first part to break, that would explain the carnage (even though I would expect less with just 1 broken valve)

 

this also doesn't explain the carnage in the other cilinder, mmm. I wonder.

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Some of that valve/piston found its way (got sucked) into the other cylindar through the head. Looks to me like a classic sucked valve. Sorry. that sucks especially now that aluminuim values are down.

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look at what I circled, it may be the "key" to solving the puzzle

 

theory: whatever it was, part of it was stuck at the valve seat, when the valve tried to close, it lost it's head, and upon piston down stroke the head got lodged between the piston crown and cylinder head in the up stroke, since the piston rod must move, the piston corwn curmbled adding more debris and finally stopping the crank

 

and perhaps part of whatever it was, is circled in orange, also went for a ride on the other cylinder

 

perhaps it came from the carb, definately looks like it went through the intake system

post-1818-136027630827_thumb.jpg

Edited by subiemech85
added attachment

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look at what I circled, it may be the "key" to solving the puzzle

 

theory: whatever it was, part of it was stuck at the valve seat, when the valve tried to close, it lost it's head, and upon piston down stroke the head got lodged between the piston crown and cylinder head in the up stroke, since the piston rod must move, the piston corwn curmbled adding more debris and finally stopping the crank

 

and perhaps part of whatever it was, is circled in orange, also went for a ride on the other cylinder

 

perhaps it came from the carb, definately looks like it went through the intake system

 

All I can see is the thumbnail. It just spins when I click it. What is circled?

 

If it's the thing lodged in the #3 piston, I think thats a chunk of the #1 piston. Can you post your pic some other way?

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I saw that squarish piece too before you posted and thought the same. It looks as if it could be the end of a punch, or end of a tool, squarish and twisted/smashed.

 

look at what I circled, it may be the "key" to solving the puzzle

 

theory: whatever it was, part of it was stuck at the valve seat, when the valve tried to close, it lost it's head, and upon piston down stroke the head got lodged between the piston crown and cylinder head in the up stroke, since the piston rod must move, the piston corwn curmbled adding more debris and finally stopping the crank

 

and perhaps part of whatever it was, is circled in orange, also went for a ride on the other cylinder

 

perhaps it came from the carb, definately looks like it went through the intake system

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Nasty!!! The thing that i have run into before is when things come apart at any kind of rpm, pieces can end up everywhere. I blew up a 2.3 ford in a mini stock one time and had lifters in the intake under the carb.:eek:

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look at what I circled, it may be the "key" to solving the puzzle

 

theory: whatever it was, part of it was stuck at the valve seat, when the valve tried to close, it lost it's head, and upon piston down stroke the head got lodged between the piston crown and cylinder head in the up stroke, since the piston rod must move, the piston corwn curmbled adding more debris and finally stopping the crank

 

and perhaps part of whatever it was, is circled in orange, also went for a ride on the other cylinder

 

perhaps it came from the carb, definately looks like it went through the intake system

 

Agreed....

 

FOD looks nothing like one would expect to find in an engine, not sure what it was originally.

 

FOD wound up in nieghboring cylinder do to the broken valve being the "intake". FOD got tossed back into intake "after" the valve head broke off, then found it's way into the adjoining cylinder on "it's" next intake stroke.

 

Piece of FOD is seemingly straight piece of metal, maybe squarish of cross-section. Not real sure of origin..... Definetly didn't need to be there...

 

 

For those who don't know; FOD is Foriegn Object Debris.

Leads to Foriegn Object Damage = catastrophic engine failure. As evident by pics...

 

Think of that plane that recently "landed" in the Hudson. Birds are definetly FOD. They do not belong in an engine, there for,,, they are FOD.

 

If it ain't fuel or air,,,, it don't belong in an engines combustion cylinder/chamber.

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it is Hard to Believe that a Piece of Metal like That could find its Way Down a Carb`s Throat, Thru the intake to fall across one Valve`s Way to the Cylinder... But it is Strange World after All...

The Cause Could be a Broken Valve, but if that Part Doesn`t Belong to the Engine, I believe that could be part of some tool Left -dropped- inside the intake Manyfold when someone took the Carb appart, maybe for service, before you obtained that Engine.

Back in 1986, one Uncle had a VW Mini Bus with a Nice Smooth Workin` Boxer engine, untill his Mechanic Dropped the Unscrewed Top of a Spark Plug, inside the Cyl Thru the Spark plug`s Hole on the Head... Same Disaster like your Subie`s engine! ... :-\ ...

it is So Sad, but I Believe that Now you can Think on Swappin` an Upgraded -Bigger- Engine there, like an EA81...

Good Luck!

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When I killed the 390 in my F100 (same thing, dropped valve), there was crap EVERYWHERE.

I thought "key stock" when I saw that #3 piston as well, I do have to wonder if that played a part. The thing I'm having a bit of a time with is that you dropped an intake valve- I have never seen an intake drop, it's always the exhaust. I can see it getting wedged open and hitting the piston though, and the stem is obviously bent. That guide looks gone, as well as maybe a crack in the head too?

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Damn, that is whack :dead: Im thinking a part of the carb let loose and caused that damage, did you check that? My buddy's Camaro suffered a similar fate when the stud for the air cleaner somehow made it into one of the pistons.

-Bill

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Is there anything wrong with the lash adjusters or rockers that would have shoved the intake valve inward? Have you taken off the valve cover yet?

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Is there anything wrong with the lash adjusters or rockers that would have shoved the intake valve inward? Have you taken off the valve cover yet?

 

 

how else would he remove the head?

 

even if the pushtube is bent, the valve can still operate BTDT

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what ive the valve failed,smashed the piston,the remains of the piston smashed into the head, which lifted the head ever so slightly and allowed FOD into #3?At that point the engine was slowed down enough that the piece in #3 stopped the motor?We are talking about a 1000th of second from valve failed to siezed engine...

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Uberoo's suggestion is not too likely. If the head bolts stretched enough to allow that big chunk to slide from one cylinder to the other, the head would have been found lying on the road.

 

It most likely came in through the intake port.

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