Poll 2.5T Coolant Leak/Engine Replacement. What can be done to prevent?

Who is having coolant leak issues and have had their engines replaced?

  • Yes

    Votes: 5 21.7%
  • No

    Votes: 18 78.3%

  • Total voters
    23

sm1ke

Work In Progress..
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Contributor
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Canada
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'18 CX-9 Signature
So shiny! Wish there was a way to tell if there were revisions made to the new engine to address these potential coolant leaking issues.
 
Picked up the cx9 this afternoon and man, its great to have it back! Such an awesome vehicle! As far as root cause per the mazda hotline that they called: cracked head. Mazda Hotline reccomended the engine replacement. The engine they put in is part # PYZ3-02-300D....the latest revision, 12,000 mile warranty. They told me it was the latest revision and that it would eliminate the issue i had....thats all i could get out of them. The car is running perfect!
 
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Winnipeg Canada
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2017 CX-9 GT
I looked up that part number on this site:

https://www.zoomzoomnationparts.com...-PARTIAL---CONVENTIO/98566026/PYZ302300D.html

It asks you to select a model year to check if it fits. Just for fun I clicked on 2017, the year mine was made. It told me it didn't fit. That's odd. I tried 2016 and 2018 as well, again, no fit. However, 2019 fit as do 2020 and 2021. So my guess is this part came out for the 2019 model years and their computer just isn't aware that it fits on older models as well. So I think someone was theorizing that 2019+ models had some engine change that fixes this issue. This kinda supports that.
 
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2007 Mazda CX-9 Touring
Just wondering do the regular 2.5 engines without the turbo have this same problem with the coolant leaking?
 
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2007 Mazda CX-9 Touring
Hi Andrewnds. Based on your answer i suspect that they just took the regular skyactiv 2.5 and slapped a turbo on it without upgrading the heads or the bottom end of this engine. As the other poster said mazda told him that there was a crack in the head. Makes you wonder what they were thinking when they did this, should have been with upgraded heads and bottom end.
 
Hi Andrewnds. Based on your answer i suspect that they just took the regular skyactiv 2.5 and slapped a turbo on it without upgrading the heads or the bottom end of this engine. As the other poster said mazda told him that there was a crack in the head. Makes you wonder what they were thinking when they did this, should have been with upgraded heads and bottom end.
To be fair, it’s still not a super common problem. People also turbo older Mazda engines without issues (thinking specifically Miata’s) so the “heads and bottom end” could have passed through Mazda’s engineering team and been given the green light to turbo as is. But as @youri said, you are making an assumption they did nothing other than “slap a turbo” on the existing engine. I guarantee you they did not just decide one day to throw that turbo on and push it customers without testing it.
 

andrewnds

2021 CX-5 Signature, 2012 Mazdaspeed3 Tech Pkg.
Hi Andrewnds. Based on your answer i suspect that they just took the regular skyactiv 2.5 and slapped a turbo on it without upgrading the heads or the bottom end of this engine. As the other poster said mazda told him that there was a crack in the head. Makes you wonder what they were thinking when they did this, should have been with upgraded heads and bottom end.
I have no "official" answer to that, but from my knowledge they wouldn't do that. They didn't do that with the last gen turbo DISI engine and I doubt they'd do it now. I couldn't see that being possible, too much would need to be changed (compression ratios, stronger connecting rods, more fueling etc).
 
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ACT, Australia
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2016 CX9 Azami
I just had mine inspected at by Mazda and an independent specialist (pressure test, ocular inspection, etc.). All clear at 104,500+ kms. It seems that the issue is fairly rare, considering the number of CX-9's sold (well over 110,000 units globally) vs the reported issues. Would be good to find out if the smaller models with the same engines have similar issues.
 

JPL

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2018 Mazda6, CX-9
Hi Andrewnds. Based on your answer i suspect that they just took the regular skyactiv 2.5 and slapped a turbo on it without upgrading the heads or the bottom end of this engine. As the other poster said mazda told him that there was a crack in the head. Makes you wonder what they were thinking when they did this, should have been with upgraded heads and bottom end.

No, Mazda definitely modified the standard 2.5 to handle the extra load and heat of the turbo right from the start in 2016. I remember Dave Coleman specifically saying this before the CX-9 launch. (Coleman is a lead engineer at Mazda).