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Spark Plug meets Piston-OT

7

71ford100

Member
It is kind of tractor related as my license plate is MM (Minneapolis-Moline). Anyways several people know my DD is an '01 Mustang Cobra. The middle of last week I got about a half mile from home when a terrible racket started happening. Started doing diagnostics yesterday and quickly stumbled upon this plug. This is the second time in 20,000 miles I have had lower end problems; this time I think we are going to do a complete OH with all forged internals to get it forced injection ready. I'll hold off putting on a SC until after I put a built tranny in as I will tear that old 3650 to shreds.
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has that had a spark plug blow out that was repaired with an insert that could be too far down letting the plug hit the piston or are you just failing rod bearing letting piston come up and hit the head and spark plug ?
 
My guess is either a wrist pin letting go or as you said a bad rod bearing. I had the crank ground and put in new rods and mains in about 20k ago so I am wondering if one of the Torque to yield bolts broke. Does anyone know if you have to use two sets of TTY bolts one to check rod and main clearences and then a new set when you torque it to put it back together after checking?

I can't tell if it did any damage to the piston so I'm just going to pull it apart and be safe rather than sorry. It doesn't appear that it had been repaired in the past (aluminum heads and block too).
 
In my experience you only need/use 1/2torque to check clearnce on brgs, so TTY bolts shouldn't be affected by checking.
 
I remember a strip run when I had a weak valve spring that caused me to float a valve in a 427 Chevy at about 8,300 RPMs, and that was with triple springs. That made a mighty big hole in that slug, and you should have seen what the slug hammering it back through the combustion chamber of the head did to that aluminum head. There was a whole lot of scrap going on during that expensive losing run. I have seen weak threads in a head allow a spark plug to blow out. It happens. But if an internal touching a plug is the cause of it jetisonning, well, rebuild time is coming very soon.

Mark
 
That spark plug came loose and came out. It is bent from bouncing in the hole under the coil and boot. It has been leaking for awhile.
 
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