2.7 engine failure tracking thread - Ford Please!

mpeugeot

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Ok, it's about time to start this thread. We need to start tracking which engines are dropping valves, otherwise, it's not gonna happen.

If you have a failed motor, here is what we are looking to track:

Failed Part Number: MB3E-6007-AA (example: Engine)
Engine Julian Date: 21XXX
Engine Sequence Number: (last 6 digits of the serial number)
Mileage of failed motor: 2312.0 (example)
Cause of failure: Best guess/Ford answer
Replacement Part Number: MB3Z-6006-A
New Engine Julian Date: 21XXX (if replaced)
New Engine Sequence Number: (if replaced)

If your motor hasn't failed or isn't a replacement for a failed motor, please do not post its serial number here, but feel free to join in the discussion.
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mpeugeot

mpeugeot

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FAQ:

Decoding Ford Part Numbers 101 (and possibly wrong):

ford-part-numbers-png.png



MB3Z-6007-AA
MB3 = 2021 Bronco
Z = Parts Dept Order
6006/6007 - engine
AA - Major Revision 1, Minor Revision 1

Perhaps A is a 2.7 (MB3Z-6007-A) and B is a 2.3 (MB3Z-6007-B)

You can read more here: https://m.roadkillcustoms.com/decode-ford-part-numbers/


MB3Z-6006-A <- Possibly pre-production
vs
MB3Z-6007-AA <- our original part numbers
vs
MB3Z-6007-B <- later part number from what I can tell or perhaps an interchange part
MB3Z-6007-C <- later part number from what I can tell or perhaps an interchange part
 
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mpeugeot

mpeugeot

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User: mmcq
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21???
Engine Sequence Number: ???
Mileage of failed motor: 1146
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date: 21???
New Engine Sequence Number:

User: Broncoshrimp
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21160
Engine Sequence Number: 120068
Mileage of failed motor: 2400
Cause of failure: Valve
Replacement Part Number: MB3E-6006-AA <- Earlier revision engine???
New Engine Julian Date: 21125
New Engine Sequence Number: 120221

User: 69 Mach I
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21161
Engine Sequence Number: 120300
Mileage of failed motor: 2744
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date: 21XXX
New Engine Sequence Number:

User: estone
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21209
Engine Sequence Number: 131010
Mileage of failed motor: < 1000
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date: 21XXX
New Engine Sequence Number:

User: Nikole
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21166
Engine Sequence Number: 120417
Mileage of failed motor: 2900
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date:
New Engine Sequence Number:
 
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fschael

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FAQ:

Decoding Ford Part Numbers 101 (and possibly wrong):

ford-part-numbers-png.png



MB3Z-6007-AA
MB3 = 2021 Bronco
Z = Parts Dept Order
6006/6007 - engine
AA - Major Revision 1, Minor Revision 1

Perhaps A is a 2.7 (MB3Z-6007-A) and B is a 2.3 (MB3Z-6007-B)

You can read more here: https://m.roadkillcustoms.com/decode-ford-part-numbers/


MB3Z-6006-A <- Possibly pre-production
vs
MB3Z-6007-AA <- our original part numbers
vs
MB3Z-6007-B <- later part number from what I can tell or perhaps an interchange part
MB3Z-6007-C <- later part number from what I can tell or perhaps an interchange part
Those looks superseded service part numbers.

When prefix has a Z at end, It's a service number.
 
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mpeugeot

mpeugeot

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Those looks superseded service part numbers.

When prefix has a Z at end, It's a service number.
Well if someone can school me on the right way to read them, I would really appreciate it.
 
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mpeugeot

mpeugeot

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69 Mach I

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User: mmcq
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21???
Engine Sequence Number: ???
Mileage of failed motor: Unknown
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date: 21???
New Engine Sequence Number:

User: Broncoshrimp
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21160
Engine Sequence Number: 120068
Mileage of failed motor: Unknown
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date: Unknown
New Engine Sequence Number:

User: 69 Mach I
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21161
Engine Sequence Number: 120300
Mileage of failed motor: Unknown
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date: 21XXX
New Engine Sequence Number:

User: estone
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21209
Engine Sequence Number: Unknown
Mileage of failed motor: Unknown
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date: 21XXX
New Engine Sequence Number:

User: Nikole
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21166
Engine Sequence Number: 120417
Mileage of failed motor: Unknown
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date:
New Engine Sequence Number:
2744 miles for me. BTW....my Ford App says my Bronco is in "deep sleep mode". :ROFLMAO:
 
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mpeugeot

mpeugeot

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BTW, seeing two things -

one failed motor was a 131XXX series, so that sucks
one documented failed motor was replaced with an earlier revision dated 21125, seems like a reasonable assumption that either 6006-AA motors or motors built before 21125 "should" be unaffected. Otherwise Ford is not playing it smart.
 

navi

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If the problem is with some 3rd party springs or seals etc then this might not be limited to any particular range.
We would be at the mercy of any poorly made part getting picked up and put in a new engine build.
Welcome to the new normal.
If you want a reliable newish ride, buy a 2018-2019 Honda or Toyota.
 
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mpeugeot

mpeugeot

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If the problem is with some 3rd party springs or seals etc then this might not be limited to any particular range.
We would be at the mercy of any poorly made part getting picked up and put in a new engine build.
Welcome to the new normal.
If you want a reliable newish ride, buy a 2018-2019 Honda or Toyota.
LOL, that's awesome advice, I'll head over to my Toyota dealer now... I have been missing the excitement that I can only find in the RAV4. ;)
 

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If the problem is with some 3rd party springs or seals etc then this might not be limited to any particular range.
We would be at the mercy of any poorly made part getting picked up and put in a new engine build.
Welcome to the new normal.
If you want a reliable newish ride, buy a 2018-2019 Honda or Toyota.
Sold my 2019 4Runner Limited Nightshade edition for way more than I paid back in 2018, then used some equity as DP on my bronco. I sold probably the last best most reliable Toyota made. And I couldnt be happier. I will always have a place in my heart for toyota (my first car, my family biz worked with toyota long time, owned many of them etc) but they have a lot of catching up to do.
 

j_marinelli

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Clubs
 
User: estone
Failed Part Number: MB3E-6007-AA
Engine Julian Date: 21207
Engine Sequence Number: 131010
Mileage of failed motor: < 1000
Cause of failure: Valve
Replacement Part Number: Unknown
New Engine Julian Date: 21XXX
New Engine Sequence Number:
Can you double check his Julian number?

In his thread he had said 7/28 which is 21209 (that date is stuck in my head as that is my same build date for my 2.7 though I haven't had issues as of yet with the motor).
 

Evolkidbell

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It would be interesting to possibly add Blend/Build date of the vehicle to the mix.
I checked my engine sequence and it aligns fairly close to the original blend/build date I had of June 14th. June 9th engine build date, and a July 15th actual blend/build.

I also find it interesting that they replaced @Broncoshrimp s 2.7 with an earlier built engine.
I figured most of those would have been sent to the line, unless there is a clause where Ford needs to retain XX amount of spares for repair and overhaul.
 

unfortunate

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I’m wondering if the root cause really is the valves dropping? I’ve seen the post where a Lima motor employee(they deleted their account shortly after the post..likely to Fords demand) seem to indicate a bad batch of valves affecting April build motors, but obviously it’s not true with the ones posted above.

In this thread, the guy had some voltage out of range/ misfiring issues. “The codes generated were P0201, P0205, P0301, and P0305. Cylinders 1 and 5 had out of range voltage or resistance, as well as ignition misfires” https://www.bronco6g.com/forum/thre...lem-before-100-miles-had-to-be-towed-😡.27141/
And his Bronco went into limp mode. His dealer updated the software but didn’t see anything else wrong to change out. Could this be a mild case of the problem we are seeing and his bronco was able to go into limp mode before any engine damage occurred? Anyone able to see what software updates and what they fix for the broncos? Could it possible be a tuning/timing issue that is simply solved with a software update?

The other uncertainty I’ve seen with the 2.7 is how much oil does it really take? However looking up what overfilling an engine oil can do to an engine doesn’t seem catastrophic as what we see with these blown 2.7.
 
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