1,238 Miles And She Needs a Heart Transplant (My Assessment). (Engine failure)

I know the feeling. My 2020 (purchased with 3,500 miles) snapped a secondary timing chain the morning after I drove it home. A gut punch for sure! 26 days later it was fixed. Good ever since.

Machines break, machines get fixed. Hang in there.

I couldn't imagine the heartbreaking feeling of this. Really sorry this happened to you. I heard of a very similar thing happening with a 500 from the sales manager where I bought the Mach yesterday. He was telling me the story of them changing out the motor and reinstalling the supercharger, how he had to help the tech with the supercharger it was so heavy. I need to call him on something tomorrow and I now want to find out exactly what hapened to that motor. Was a similar infant mortality event. I hope you get a quick fix from Ford and get back on the road.

Update: Ford gave the authorization to my dealer to open the valve cover. A broken valve spring was discovered. Authorization has now been given by Ford to remove the head for further inspection. I will have another update after Memoriel Day.

So great that they're on it and you're being taken care of👍
Have an awesome holiday weekend!!

FWIW. Here’s the word from the dealership that saw the failure I had mentioned.
This is what he mentioned:
“No compression on one cylinder , best guess valve issue “ (total replacement)
“Others have had front crank seals leaking , just front timing cover gasket and crank seal replacement not a full motor”

Weird. A broken valve spring would not oil down the plug. It could cause the valve to poke a hole in the piston tho. But that would not be immediate. Ask how I know. You would feel it hitting the piston. Broken rings would still have some compression. Strange one

So sorry this happened and I for at least a while have it in my head whenever I start my car.

Maybe a silly question but If the niche line for building these engines is no longer, where do replacements come from?

worstnightmare said:

Weird. A broken valve spring would not oil down the plug. It could cause the valve to poke a hole in the piston tho. But that would not be immediate. Ask how I know. You would feel it hitting the piston. Broken rings would still have some compression. Strange one

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Not strange at all. Broken valve spring can turn and bind holding the valve open. Piston hits the valve that is hanging open and it’s game over. All speculation unless they pull the head and Ford may not want to waste the money to find out. A bore scope could tell them a lot.

Sorry to hear this happened to the OP.

OF5.0 said:

Update: the top end of the engine is disassembled. The cylinder head comes off tomorrow, hopefully. If so, then the results of the inspection of the piston and cylinder bore will dictate which route is taken.

Photos of the failed intake valve spring and partially-disassembled engine:

View attachment 277175
View attachment 277174

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Did they say how far down it broke? Hard to tell from the picture.

OF5.0 said:

Update: the cylinder head was pulled this morning. There is some damage in the cylinder bore. A new long block has been authorized by Ford.

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Sorry to hear. Hopefully repairs go smoothly.

OF5.0 said:

Update: the cylinder head was pulled this morning. There is some damage in the cylinder bore. A new long block has been authorized by Ford.

Update: Damage to cylinder bore (it can be felt with a fingernail):

View attachment 277288

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Sorry to hear that Scott, I am curious about something since Ford did authorize a new long block, and they did it quickly, I am curious how long until you get the long block?

Living over here, I hope I never have to deal with something like this, I am sure it would be months before I would be back on the road.

I hope it all goes well and quickly Scott.

GT500 The Mistress said:

Sorry to hear that Scott, I am curious about something since Ford did authorize a new long block, and they did it quickly, I am curious how long until you get the long block?

Living over here, I hope I never have to deal with something like this, I am sure it would be months before I would be back on the road.

I hope it all goes well and quickly Scott.

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I am hoping to have a rough timeline sometime Tuesday or Wednesday.

Update: long block should arrive at the dealer in 5-7 business days.

That looks like a crack in the cylinder bore. If the valve hit the piston, it could have kicked the piston sideways enough for the skirt to put a crack in the cylinder. Was the valve bent? Any pics of the crown of the piston?

OF5.0 said:

Update: long block should arrive at the dealer in 5-7 business days.

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Wow, that is pretty fast. Scott you'll be back out on the road very soon 🙏

OF5.0 said:

Valve didn’t look bent. I wasn’t able to get a proper photo of the top of the piston. Here’s a photo of the cylinder head:

View attachment 277916

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Definitely looks like it’s been steamed. Did they say where they thought the coolant went into the chamber? Or was it cleaned off when they were inspecting it?

AZ21GT500 said:

Definitely looks like it’s been steamed. Did they say where they thought the coolant went into the chamber? Or was it cleaned off when they were inspecting it?

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No coolant was in the cylinder. My guess for the cleaner-looking combustion chamber was all of the unburned fuel from the misfire/no ignition in the cylinder.