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BroncoDude

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That table is a great visual aid...but the more hard info I see, the more questions come to mind.

If the root cause is the rumored bad valve batch, I would expect failures in a tighter cluster of engine build dates -OR- a much larger number of reported failures within that ~2 month window.

No??? This info makes me think there was intermittent valve defect across a production run much larger than a 'batch'.

Engine Build-Date
21160 (09 June)​
21161 (10 June)​
21166 (15 June)​
21209 (28 July)​
21209 (28 July)​
21214 (02 Aug)​
21216 (04 Aug)​
My engine is 21214. How can there be 2?
Ford Bronco 2.7L blown engine failure list . . 68 so far [Updated: December 13, 2022] 20220107_104337
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So has there been anything said about the circumstances that these engine's had blown.
Were they just driving down the road and BLAM. Or were they rock climbing our mud bogging and HELLO, welcome to the shit show?

I have the same build as some of the other dates. So your sayin there's a chance?
 

69 Mach I

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So has there been anything said about the circumstances that these engine's had blown.
Were they just driving down the road and BLAM. Or were they rock climbing our mud bogging and HELLO, welcome to the shit show?

I have the same build as some of the other dates. So your sayin there's a chance?
I was just cruising up the interstate. Have not even had my Bronco off road yet. I was also pretty careful the first 1k miles during the break in period. No indication of an issue.....it just shut down. My g/f says she heard a "noise" first....said it sounded like I ran something over. I didn't hear anything, but my hearing isn't the greatest!
 

International_George

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Mine happened when I shut it off in the driveway at home. Leisurely freeway drive before that. No indication of an issue.
 

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I was just cruising up the interstate. Have not even had my Bronco off road yet. I was also pretty careful the first 1k miles during the break in period. No indication of an issue.....it just shut down. My g/f says she heard a "noise" first....said it sounded like I ran something over. I didn't hear anything, but my hearing isn't the greatest!
Def a BLAM situation, great ! now I have a feeling I’m driving a ticking time bomb!
 

da_jokker

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So has there been anything said about the circumstances that these engine's had blown.
Were they just driving down the road and BLAM. Or were they rock climbing our mud bogging and HELLO, welcome to the shit show?

I have the same build as some of the other dates. So your sayin there's a chance?
I believe the very first one reported on this forum was a person whose engine blew soon after running it in the sand dunes. However most after that, their engine gave up while just cruising. Almost to the point that thoughts of running to lean or timing may happens causing this.
 

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I've not seen any other discussion if the catastrophic engine damage was caused by a broken timing chain or if it was simply broken as a result of the engine locking up?
Recap: December 23rd, while stopped at a stop light, the engine was at idle when it abruptly shut off (only 2,024 miles on it). The 2.7 would simply not restart. The Bronco ended up being towed to local Ford dealer where it discovered that the timing chain broke, the valves had destroyed the pistons and metal shaving contaminated the entire oil system.
 

Bubbabow

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Don’t know on mine but was driving on highway all of a sudden the compression on the engine went crazy, the pressure dropped up and down oil started spilling out the bottom as well as all other fluids and it died. The mechanic said all values were destroyed the pistons etc blown apart and metal went throughout including the turbos. It simply self destructed totally. So hard it blew the oil plug out of the engine and as said earlier all fluids dumped. It was so destroyed that determining the root cause is not possible the whole engine self destructed. Could have been many many things caused it but on mine no telling.
 

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Don’t know on mine but was driving on highway all of a sudden the compression on the engine went crazy, the pressure dropped up and down oil started spilling out the bottom as well as all other fluids and it died. The mechanic said all values were destroyed the pistons etc blown apart and metal went throughout including the turbos. It simply self destructed totally. So hard it blew the oil plug out of the engine and as said earlier all fluids dumped. It was so destroyed that determining the root cause is not possible the whole engine self destructed. Could have been many many things caused it but on mine no telling.
top-fuel-explode.gif
 

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I had a build date of 10-18. Engine date is 21214 with a sequence number very close to another engine that did fail.

What I find a bit interesting is my Bronco (and several others) was held at the plant for at least another month due to what they called QC issues. I’m hoping Ford was being proactive and replacing parts that could possibly be faulty due to reports they were getting. I know chances are slim mine would fail, but it would be nice if we could find out if Ford did anything to minimize this on our engines that were built in this time frame.
 

ColoradoKid26

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I panic checked my engine this morning. Nov 23? Hopefully it is past all the grenaded engines
Ford Bronco 2.7L blown engine failure list . . 68 so far [Updated: December 13, 2022] Bronco Engine#
 

Jwall

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I had a build date of 10-18. Engine date is 21214 with a sequence number very close to another engine that did fail.

What I find a bit interesting is my Bronco (and several others) was held at the plant for at least another month due to what they called QC issues. I’m hoping Ford was being proactive and replacing parts that could possibly be faulty due to reports they were getting. I know chances are slim mine would fail, but it would be nice if we could find out if Ford did anything to minimize this on our engines that were built in this time frame.
Mind hasn’t blown up, but kind of odd. Our build dates are like 17 days apart, but our engines are 80 days a part. 11/4 build, 294 engine Julian date.
 

Carolina Jim

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It was so destroyed that determining the root cause is not possible the whole engine self destructed.
Hopefully, the issue isn't a contagious virus...we're only a few miles apart :)
 

Bmadda

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I've not seen any other discussion if the catastrophic engine damage was caused by a broken timing chain or if it was simply broken as a result of the engine locking up?
It's quite possible the tech just assumes the timing chain is broken, because there is valve damage...Ford generally doesn't pay any teardown time if they know an obvious internal catastrophic failure has occurred, and they believe to know the root cause. Would be interesting to know if in fact the tech took it apart far enough to see if the timing chain was intact.
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