Blown head gasket for CX-5 Diesel

Patsita

Member
:
Mazda 2 Skyactiv-D
Are there any cases here? I come from Thailand and must say that there are many people facing this problem both in Thailand and Taiwan.

I would like to collect information and a solution as well as Mazdas responsibility. Thanks.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
Is there any case here?!?
I come from Thailand and must say that therere many people are facing this problem both Thailand and Taiwan.
I would like to collect information and solution as well as Mazdas responsibility...
We don't have diesel CX-5 in the US, and you won't be able to get any responses from here.

Mazda has stopped selling diesel CX-5 in Taiwan starting 2019 MY although diesel CX-5 has been the best seller for CX-5 there. That speaks the issue of blown head gasket on CX-5's diesel where Mazda apparently has no resolution yet to fix the problem other than keeps replacing the engine. In Taiwan Mazda would replace the engine for free even if the CX-5 is way over the warranty period.

IMO this blown head gasket issue is caused by engine overheating in a hot and humide environment, like in Taiwan and Thailand, when engine is working hard such as during the long uphill driving. Of course why there's no warnings from any overheating indicator or message when the engine is overheating is a mystery and Mazda apparently has no clue on this at this time.
 
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2017 CX5 AWD Touring
Sadly, the Mazda diesel is a disaster. I had high hopes but all the problems they have been having, the design is flawed. Blown head gaskets are something that is not minor. Maybe it has something to do with the compression and lack of support studs/bolts in the block and head, which is not an easy fix as it's a design flaw.

The Mazda diesel is dead in the USA. That's for sure.

Back in the 80's the Big 3 all learned the hard $$ way that designing ones own diesel engine is not easy and inexpensive. So the Big 3 did what was smart. Just outsource the diesel engines to manufacturers who have been doing diesel engines for decades and they know what they are doing. No point of being a jack of all trades. So Cummins, International and I forget the 3rd were chosen. Mazda should have just outsourced their diesel to someone else (except VW). (evil)
 
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SignatureCX5

Member
:
2019 Signature CX-5 Black Mica
The bleeding edge technology Mazda is using on the diesel would keep me away until there was a food runnkng tracn record. Its a great engine but just like the rotary I dont know if they can get the reliability from it. Glad they dont offer it in the US.
 
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CX5 GT
How many miles? are you under warranty or not? How did it happen? overheating? loss of coolant?
Gaskets usually dont blow out of nowhere.
The diesels are popular in europe and I see a lot over 100k.
 

Patsita

Member
:
Mazda 2 Skyactiv-D
Thank you very much yrwei52.
As we have problem here in Thailand and still no feedback from Mazda yet :(

Mazda should stop selling this in Thailand too. No more victims.
 

Patsita

Member
:
Mazda 2 Skyactiv-D
How many miles? are you under warranty or not? How did it happen? overheating? loss of coolant?
Gaskets usually dont blow out of nowhere.
The diesels are popular in europe and I see a lot over 100k.

In Thailand we found 70,000-100,000 km.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
Thank you very much yrwei52.
As we have problem here in Thailand and still no feedback from Mazda yet :(

Mazda should stop selling this in Thailand too. No more victims.
From what I read in news from Taiwan those blown head gasket / overheating problems are happening on diesel CX-5 above 40,000 miles / 64,000 KM. Mazda in Taiwan didn't honor the free engine replacement until a group of CX-5 owners had a protest at Mazda headquarter in Taipei. Mazda Taiwan reported the problem to Mazda Japan, the result is those CX-5 owners would get engine replacement but didn't explain the cause of the problem. Those CX-5 owners were worried the new engine would fail again and demanded longer warranty. Eventually Mazda is simply stopped the sales on best selling diesel CX-5 in Taiwan.

Based on the stories from those diesel CX-5 owners, there's no warnings of overheating until they noticed the coolant is blown out of radiator, or the head gasket simply is blown.

There're similar stories happening in Australia too and have been reported here. Looks like Mazda Australia also offers free engine replacement even without warranty.
 

Patsita

Member
:
Mazda 2 Skyactiv-D
From what I read in news from Taiwan those blown head gasket / overheating problems are happening on diesel CX-5 above 40,000 miles / 64,000 KM. Mazda in Taiwan didn't honor the free engine replacement until a group of CX-5 owners had a protest at Mazda headquarter in Taipei. Mazda Taiwan reported the problem to Mazda Japan, the result is those CX-5 owners would get engine replacement but didn't explain the cause of the problem. Those CX-5 owners were worried the new engine would fail again and demanded longer warranty. Eventually Mazda is simply stopped the sales on best selling diesel CX-5 in Taiwan.

Based on the stories from those diesel CX-5 owners, there's no warnings of overheating until they noticed the coolant is blown out of radiator, or the head gasket simply is blown.

There're similar stories happening in Australia too and have been reported here. Looks like Mazda Australia also offers free engine replacement even without warranty.

9


Thank you very much yrwei52, we hope to know the cause from Mazda together with Taiwan and Australia :(
 

ROCKETRON

Member
:
MAZDA CX5 175 SPORT NAV AUTO
Why do they keep providing new engines. Surely a head gasket could just be changed. If they are changing engines then I would think that the block and head must be warping so a new gasket wouldn*t be effective.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
Why do they keep providing new engines. Surely a head gasket could just be changed. If they are changing engines then I would think that the block and head must be warping so a new gasket wouldnt be effective.
Before the whole thing exploded, most diesel CX-5 owners in Taiwan did shave and smooth out the aluminum cylinder block and head with new gasket to fix the problem as Mazda dealers wont do this type of job because it affects the compression ratio, and even if theyre willing, itd be too expensive. Its an expensive repair nevertheless, and thats why they held the protest against Mazda in Taiwan trying to find the root cause of the problem.

Yes in most cases the aluminum cylinder block and head are wrapped or cracked caused by overheating without any warnings based on news reports.
 

ROCKETRON

Member
:
MAZDA CX5 175 SPORT NAV AUTO
Are these problems only on 13/14 reg cars or are newer ones also susceptible? I am surprised though that we don*t hear or see any head gasket failures on uk cars, only camshafts and turbos.