2.5L NA Cracked Cylinder Head with Oil Leaking
- Thread starter CX5Nut
- Start date
It is still happening with the 2022 models. I just got my cylinder head replaced under warranty. It's a CX-5 with a skyactive engine; it's not the turbo. I bought it new in March of 2022 and it only has 13,000 miles on it. There were no warning signs or symptoms other than the low oil level light coming on. I have the oil changed twice a year, so that definitely shouldn't have happened. I stopped immediately so no damage was done to the engine. I hope the replacement head will last.
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- Canada
Sorry to hear, that's disappointing. Do you have an invoice that you can post? I'm sure others would be interested in seeing what was itemized on the invoice (to compare part numbers and such).
This in in reply to sm1ke. I think I posted a blank reply a minute ago.
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- Canada
Thanks for posting.
We have a 2019 cx5, leaking oil down back of engine. Minimal dripping. Big odor. 32k miles. Brought it to Mazda. Drivetrain warranty still active. Part & labor covered. This is what was replaced. If there are any mechanics out there, how does this look to you? Thanks & Good luck to all.
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Just curious if this looks reasonable to you? We have a 2019 cx5 just got back after repair. 32k miles. This is what they replaced. Thank you so much for the info you posted.
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That parts list actually looks more than ok, with more gaskets being replaced than usual and also the HPFP pipe, which is surprising to see. I don't understand why the PYFA12360A solenoid is on there at all, much less twice, but perhaps it broke during the repair work and had to be replaced.
But no problem from your perspective however, because all the matters for you is that your vehicle is running fine and not leaking any fluid. Be thankful that your vehicle was still under warranty when the head cracked, and that you didn't have to go to war with Mazda about getting extended coverage!
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- Plano, Texas, USA
The cylinder head assembly PYY4-10-SJ0 which includes valves、valve springs、valve spring seats、and cotters pre-installed has been used in recent cracked cylinder head repairs on the 2.5L NA with cylinder deactivation as showed in reports with invoice.
Service Alert No. SA-037/23: New Cylinder Head Assembly Established
eljavi‘s Invoice
DianeJinOK‘s Invoice
Your dealer replaced a lot more gaskets、grommets、 and O-rings even an expensive fuel pipe (PYMM-13-290A, $136.36) and 2 solenoids (PYFA-12-360A, $86.70) than other Mazda dealers. While 2 gallons of FL-22 coolant were used which didn’t show in other invoices, but yours doesn’t show any oils for oil change that’’s strange. Apparently the Master Tech at each Mazda dealer has different opinions to do the head replacement job on the 2.5L NA with CD.
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- Plano, Texas, USA
This Mazda tech @thispart was talking about the cracked head problem on both 2.5T and 2.5L NA with CD. IMO the cracked head problem happens more often on the 2.5T, and Mazda has modified the head and exhaust manifold gasket for the 2.5T to fight against the crack.
"and Mazda has modified the head and exhaust manifold gasket for the 2.5T to fight against the crack."
What about the non turbo? Any modification to stop a replacement head from doing the same thing? And will Mazda announce an extended warranty for the leaking head? This issue would keep me from buying another Mazda. I get regular emails to update to a new car. I think not.
How did you find out about a 'modified' head?
What about the non turbo? Any modification to stop a replacement head from doing the same thing? And will Mazda announce an extended warranty for the leaking head? This issue would keep me from buying another Mazda. I get regular emails to update to a new car. I think not.
How did you find out about a 'modified' head?
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- Plano, Texas, USA
Based on the TSB for the 2.5T from Mazda:
TSB No. 01-013/21: Coolant Leaks at Cylinder Head
“DESCRIPTION
Some vehicles may have coolant leaks at the cylinder head around the exhaust manifold (as shown below). There may be cracks at the stud bolt hole (1) or at the outside of the exhaust manifold (2).
Cracks may be caused by:
• Deformation of the exhaust manifold during usage causing unexpected force to certain areas of the cylinder head.
• Residual stress generated during production in the cylinder head material may be greater than expected. The
external force from the exhaust system when driving over bumps may cause unexpected force to certain areas of the cylinder head.
To eliminate this concern, the design of the exhaust manifold gasket and the cylinder head has been modified to reduce the force on the cylinder head.”
So far we haven’t seen a cracked cylinder head TSB from Mazda for the 2.5L NA with cylinder deactivation. And the Service Alert has only created a new part number for cylinder head assembly to ease the head replacement job. This also makes me believe the cracked head problem on 2.5L NA with CD happens less frequently in percentage and Mazda simply just chose do nothing on head design. But in any event this’s a major repair however how less frequently it happens. It would be a major expense for a car owner without warranty.
Another possible major problem on the 2.5L NA with CD is the failing switchable hydraulic lash adjusters used by the cylinder deactivation. There’re a couple of TSBs for that but many CX-5 owners have overlooked this problem as they think the tapping noise from valves is normal.
Yeah as I have been saying all along since 2018 that I wouldn’t buy a car with problematic cylinder deactivation. And I changed my purchasing plan for a new CX-5 in 2018 when I learned Mazda “secretly” and “suddenly” added CD to the reliable 2.5L NA. And I then got a 2018 Toyota Yaris iA, a Mazda2 in disguise, instead.
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Thank you so much for the info. You really put my mind at ease. We have had very a rough time lately and your words are a ray of hope. I appreciate you more than you will ever know. You are amazing!
Thank you so much for your comment. We just had our oil changed with them. That's when they noticed the leak. He also cleaned the under chassis. It was covered with oil all the way back to the exhaust. It was probably leaking oil for the past year.
Thank you so much for the comment.
I fully understand your lack of confidence. You indicated in your other thread that you're considering trading this 2018 in on a newer vehicle. If that works for you financially, it seems by far the best way to eliminate this ongoing concern that you've been having. And the low mileage should bring a very good trade-in value (or private sale). So is there something else standing in the way of getting rid of it?
Just wanted to post a quick tip for my fellow Canadian consumers, as I haven’t seen it mentioned in this entire thread.
The 2018-2022 base GX trim does not have CD (it finally became standard on all Canadian trims starting in 2023). Also, for 2017, none of the trims have CD in Canada.
So if you’re like me and wanting to hopefully avoid the potential issues with the cracked cylinder heads (and you’re willing to live without the extra bells and whistles of the higher trims), I believe opting for the GX trim might be a good choice (or any trim in 2017) since I’ve only read that this issue seems to affect the 2.5L NA with CD and the 2.5 Turbo engines. Cheers.
The 2018-2022 base GX trim does not have CD (it finally became standard on all Canadian trims starting in 2023). Also, for 2017, none of the trims have CD in Canada.
So if you’re like me and wanting to hopefully avoid the potential issues with the cracked cylinder heads (and you’re willing to live without the extra bells and whistles of the higher trims), I believe opting for the GX trim might be a good choice (or any trim in 2017) since I’ve only read that this issue seems to affect the 2.5L NA with CD and the 2.5 Turbo engines. Cheers.
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- Plano, Texas, USA
And in US market all 2017 CX-5’s, which is the first MY for Gen-2 CX-5, do not have cylinder deactivation either. And all 2018 and newer CX-5’s will have cylinder deactivation on non-turbo 2.5L NA. 2.5T doesn’t have cylinder deactivation but also suffered cracked cylinder head with different symptom of coolant leak. And Mazda claimed the cylinder head and exhaust gasket on the 2.5T have been modified in 2021 to fight against the head cracking problem.
