Engine Replacement for a 2015

[brian.conner.129]

Due to a head gasket and valve seal failure, my 2015 engine needs a rebuild. The cost is more than I want to spend. Quoted $8-10k. If I was to buy a engine from later model, will it be a direct fit? Would I need a new ECU or wiring harness? The mechanic quoted me $1500 to pull the old engine and install a replacement if I shipped one to him

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[robvas]

Gen 3 shortblock, send your heads out to get rebuilt, have it all reassembled with new gaskets and other consumables, still going to cost you an easy $8,000

I'd start calling junkyards and searching eBay to try to find the lowest mileage 15-17 you can get.

 

[brian.conner.129]

Gen 3 shortblock, send your heads out to get rebuilt, have it all reassembled with new gaskets and other consumables, still going to cost you an easy $8,000

I'd start calling junkyards and searching eBay to try to find the lowest mileage 15-17 you can get.

Already been looking on eBay. It is my understanding that the head gasket issue was solved starting with the 2020 models. Will a 2020 be direct fit with any additional modifications?

 

[robvas]

Already been looking on eBay. It is my understanding that the head gasket issue was solved starting with the 2020 models. Will a 2020 be direct fit with any additional modifications?

No, the gen 2 computer will not run the gen 3 engine. You can however swap your gen 2 heads, timing components, etc on top of a gen 3 shortblock

 

[MrMike]

OP's vehicle says it's an Ecoboost and failure mode notes the typical head gasket pop on early Ecos.

Isn't the Eco largely unchanged through 2020 or was there a major Ecu change at 2018?

 

[robvas]

OP's vehicle says it's an Ecoboost and failure mode notes the typical head gasket pop on early Ecos.

Isn't the Eco largely unchanged through 2020 or was there a major Ecu change at 2018?

Derp. Saw it in the new posts and didn't realize it was in the Eco subforum...

 

[EchoFiveR3531]

So why are you looking at rebuild and not a Ford OEM long block?

My previous platform was a Speed 3 I ended up having to pull the original motor at 140k. From all my research and from talking to a very reputable engine builder on that platform the best choice was an OEM long block from Mazda.

Unfortunately I missed out on the last 2 OEM long blocks in the country by a week and went built motor. Built motor was fun and I had the factory fuel system maxed out on a bigger turbo and E30. At the end of the day though I knew that the motor probably wouldn't last as long as an OEM motor.

I would much rather have an engine in the car that's was assembled by the OEM if longevity is a primary concern.

LOTs of variables with having an engine rebuilt and you are putting a lot of faith in the machine shop and whoever assembled the motor. I'm not saying that it can't be done but I spent enough time on that platform to see built motors either last a long time or fail very early it's def a gamble.

Also have you looked on eBay for used motors that might be an option as well if you have a particular budget in mind.


Edit: I'm seeing that my long winded answer isn't addressing your concern.

Maybe try talking to Ford Performance about cross compatibility between your ECU and a newer Gen motor.

You could probably make a post over here also https://www.mustangecoboost.net/

I'm sure someone either here or there knows what the cross compatibility is.

 

[Samiamthemustangman]

I have the old 3.7 but I hang in an ecobost group in Facebook. Google list the head gasket and turbo problems from 2015-2017 and not in future models. I was telling them I always wanted a turbo and was t thinking about upgrading to the newer s550. I was informed just because t they got rid of the v6 doesn't mean the new cars have problemsof their own. There are several post where people have talked about head gasket engines and a few complete engine failures. Ecoboost Mustang is the name of the group if you are interested. I hate to pass this information on to you but figured id share the group because engines are a hot topic there. I haven't herd about anyone putting the newer 4s but im sure someone's done it and it will be a hot topic.
From what I understand old heads wont work with the new and improved 2020 block.

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