f350 pos ford... gasser...

[CRSMP5]

ill upload pics at some point.. but truck owner comes in... i got a miss... need you to change the rear 2 coils... i cannot get to them...

im like y?? well i changed the other 6... new plugs 2 weeks ago...

me.. whats the compression?? no clue...

me ok ill take a look at it...

so as it runs i pull coil wires and injector wires to find the dead hole... no missfire chec engine codes btw...

figure out the 3rd one back on drivers side dead...

pull coil then plug.... plug loose... well i have NEVER seen this... plug got so hot the metal/threads/electrode have melted to nothing... the heat ran up the side of the threads even to the taper seat to melt it... looks like the plug arked even trying to weld its self to the head.. very impressive...

so question to you all... why?? i told guy he needs a engine.. no way the head is any good due to sparkplug hole... and if plug melts what can valves/pistion look like anyways...

[CRSMP5]

[R.O.R-2.0]

2 words:

threaded insert..

[CRSMP5]

no id say the 2 words are new engine... the melted steel cannot do good things to aluminum... the v shape in the 1st pic that turned out real crappy, is cut into the threads of the plug... via heat... just impressive... 2 week old plug looks like that...

[bajacalal]

This isn't the V10 is it? They liked to eject the plugs from the cylinder head... though the modular V8 (4.6/5.4) engines it's based on do this too. The threads were too thin. You sure this isn't physical damage from being pushed out of it's bore and vibrating around, being subjected to escaping combustion gasses or from arcing on the cylinder head once loose? Yes there are repair inserts for this problem.

[R.O.R-2.0]

yea, if its a 4.8/5.4/6.8 modular, then they can be fixed with threaded inserts.. thats the popular fix atleast..

the threaded inserts are CONSIDERABLY larger than the actual spark plug hole, so any damage in the threads of the hole will be removed when you cut the hole big enough to thread it for the insert..

[maxfax]

X2 on what Kevin said..   Very common on post 97 modulars..  Threaded insert and they are *typically* good to go... That one does look considerably worse than most I have seen..  It had to be missing for quite some time by the looks of that.. AS far as they why, weak threads it is..  If the plugs had been changed before that exasperates the situation.. Changing plugs in those is like removing hella tight injectors from your VW, gotta take time and use caution..

There is a regular tool for doing these..  Basically it's just an extra long version of the regular thread insert tools..  Of course it's always a back hole that does it, whata PITA to get to..  

[theman53]

I would think that would buff out.

[mystery3]

It's a ford with nothing stamped cosworth attached to it, who cares?

Btw, can you get some camera photos of the plug, it looks funny in the crap phone pic but I imagine by your description I'm not seeing the full magnitude of the damage.

[clbanman]

It's a ford with nothing stamped cosworth attached to it, who cares?

...............

Well, as my grandfather used to say: "Ford, ja sicher".   I'm following in his footsteps as a lifelong Ford fan.  Mind you I'm mostly a fan of the pre 70's stuff.

Clear closeup damage pics are always welcome.    I'll second the Helicoil suggestion.   It's stronger than the parent metal.   As far as damage to the pistons, possibly not because this was likely superheated small bits of metal coming off over the course of the two weeks.   I had a Cherokee Golden Eagle with a 360 that burned through the exhaust valve right to the centre of the stem without any visible damage to the pistons (admittedly not aluminum).

[R.O.R-2.0]

heli coils suck..

time-serts are de shizznit... way stronger than any heli coil..

[mystery3]

It's a ford with nothing stamped cosworth attached to it, who cares?

...............

Well, as my grandfather used to say: "Ford, ja sicher".   I'm following in his footsteps as a lifelong Ford fan.  Mind you I'm mostly a fan of the pre 70's stuff.

I can dig mkI and II escorts, cortinas etc when ford used to make ***in' compact rwd cars and not ship them to NA.