2.7L blown engine failure list . . 68 so far [Updated: December 13, 2022]

[ryridesmotox]

I had mentioned this earlier, that this is a material (alloy) problem and/or a valve design problem. They probably changed the specification of the alloy and increased the strength of the underhead and valve head area.

I seriously doubt it's an engine management problem, this would lead more to burned valves than broken valves.

If it was a tuning/ecu issue I'd expect to see the spark plug straps and electrodes utterly melted. The ones that have been floating around here looks like the electrodes were battered but not melted. Which leads me to believe a valve issue. It's not hard to imagine a bad valve with a crack in the stem failing

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[Beach_Bum]

4 engines…at what point do you buy a Jeep lol

A Jeep would never ever be a consideration for Drew. He is the only one that I know that has a semi-truck serve as his tow pig for his Broncos when he goes wheeling. At some point, he'll have to get a double-deck carrier to accommodate his Broncitis.

 

[Snydermann]

Valves designed on the edge of reliability without wide enough manufacturing tolerances. If your valves were made within tolerances, you're probably fine, but if they drifted out of the narrow tolerances, they will fail.

By changing the material and design they increased the manufacturing tolerances so that the valves made now will have a lower failure rate.

 

[geoking]

Valves designed on the edge of reliability without wide enough manufacturing tolerances. If your valves were made within tolerances, you're probably fine, but if they drifted out of the narrow tolerances, they will fail.

By changing the material and design they increased the manufacturing tolerances so that the valves made now will have a lower failure rate.

Tim,
All we need to know is WHEN were the changes implemented ? .....and when did heads with the higher reliability valves make it into new build engines? My first bronco is due to be built next week. I don't want the old valves....smile.

 

[VictoryLights]

Valves designed on the edge of reliability without wide enough manufacturing tolerances. If your valves were made within tolerances, you're probably fine, but if they drifted out of the narrow tolerances, they will fail.

By changing the material and design they increased the manufacturing tolerances so that the valves made now will have a lower failure rate.

I think a lot of us could live with this explanation if we knew the failure rate on the delivered vehicles.

 

[navi]

Remember, it is what it is, don't live in fear, drive it like ya stole it, it's under warranty, ya'll a bunch of fishwives,
and I aint no fanboy!

 

[navi]

A Jeep would never ever be a consideration for Drew. He is the only one that I know that has a semi-truck serve as his tow pig for his Broncos when he goes wheeling. At some point, he'll have to get a double-deck carrier to accommodate his Broncitis.

He must be driving the shit out of them with zero break in then. There's a better chance of winning the lottery than blowing 3 engines in a row that have a (very roughly) 0.5% failure rate.

 

[VictoryLights]

Remember, it is what it is, don't live in fear, drive it like ya stole it, it's under warranty, ya'll a bunch of fishwives,
and I aint no fanboy!

I feel that.

However, this is an “adventure vehicle” designed and heavily marketed (“Built Wild”) to be something that takes you deep into the wilderness. How much would it cost to have one of these towed from the middle of black bear pass?

 

[Snydermann]

I think a lot of us could live with this explanation if we knew the failure rate on the delivered vehicles.

I understand.
The failure rate isn't 100%, so there is no way to know how well you can or can't sleep at night. I suspect once the engine is cycled past it's failure range the surviving engines will be okay.

 

[VictoryLights]

I understand.
The failure rate isn't 100%, so there is no way to know how well you can or can't sleep at night. I suspect once the engine is cycled past it's failure range the surviving engines will be okay.

Are you speculating about this manufacturing tolerance or do you have some inside info?

 

[JPye]

I feel that.

However, this is an “adventure vehicle” designed and heavily marketed (“Built Wild”) to be something that takes you deep into the wilderness. How much would it cost to have one of these towed from the middle of black bear pass?

Let's hope this is cleared up before someone goes full Donner Party in the wilderness.

 

[Yodi]

I still think that if you want to get Fords attention, the people that have blown engines need to report to the NHTSA as a safety issue. I also think it is just a matter of time till this causes a serious wreck. Going down the highway at 70 and you find yourself without power brakes or steering is a bad thing!

 

[DudeBronco]

Have you ever been to Lima Ohio?

LOL!! I grew up in NW Ohio, I feel that.

 

[VictoryLights]

I still think that if you want to get Fords attention, the people that have blown engines need to report to the NHTSA as a safety issue. I also think it is just a matter of time till this causes a serious wreck. Going down the highway at 70 and you find yourself without power brakes or steering is a bad thing!

You lose brakes and steering when this happens?

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