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Unread 2014-08-18, 09:11 AM   #1
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Default Lost the turbo in the wife's CX-7...DIY repair?

Apparently it's not uncommon to lunch the turbo on these things, but looking at some cursory AllData info I'm not sure I want to tackle it myself. Anyone ever done it, or know where there's some good DIY writeups? The Mazda forums are a little lacking on these things.
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Unread 2014-08-18, 09:15 AM   #2
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Hopefully turbo failures in CX-7's aren't similar to turbo failures in subarus.

The bearing metals in the oil takes out your rod bearings as the material hides out in oil coolers and lines and doesn't get removed just from changing the oil and/or the compressor blades that broke off got ingested through the engine and did damage, as well as taking out your catalytic converter.

It's quite catastrophic and more than simply a turbo replacement.
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Unread 2014-08-18, 11:55 AM   #3
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Originally Posted by Scooby24 View Post
Hopefully turbo failures in CX-7's aren't similar to turbo failures in subarus.

The bearing metals in the oil takes out your rod bearings as the material hides out in oil coolers and lines and doesn't get removed just from changing the oil and/or the compressor blades that broke off got ingested through the engine and did damage, as well as taking out your catalytic converter.

It's quite catastrophic and more than simply a turbo replacement.
The CX-7 we did last year was like this. We replaced the turbo but parts were still in the system somewhere and ended up in the engine. Engine lasted another 6 months.
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Unread 2014-08-18, 12:03 PM   #4
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I'm kinda hoping against hope that the intercooler acts as a filter LOL
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Unread 2014-08-18, 05:28 PM   #5
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I'm kinda hoping against hope that the intercooler acts as a filter LOL
That's usually the least of your worries.

The bearings in the center housing tend to leave their shrapnel in the engine's oiling system since they share said oiling system.
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Unread 2014-09-06, 08:30 AM   #6
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I would change the oil cooler and any hose you can.

I had this happen on a different turbo car, I changed the cooler and all rubber hoses, however before I removed the turbo off the car since it was toast, I bypassed the oil lines on the turbo and oil cooler and changed the oil 5 times with fresh oil, I'd run the engine long enough to warm up and change it and did a crack case clean, also stuck several super strong magnets on the bottom of the steel oil pan so it would attract any particles after the 1st oil change. Dropped the oil pan, cleaned up the pan and put a new pan gasket and refilled the oil, replaced my turbo, oil cooler and rubber oil lines and away I went. It was fine for the 2 years I drove it afterwards and then I sold it.
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Unread 2014-09-06, 08:57 AM   #7
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I would change the oil cooler and any hose you can.

I had this happen on a different turbo car, I changed the cooler and all rubber hoses, however before I removed the turbo off the car since it was toast, I bypassed the oil lines on the turbo and oil cooler and changed the oil 5 times with fresh oil, I'd run the engine long enough to warm up and change it and did a crack case clean, also stuck several super strong magnets on the bottom of the steel oil pan so it would attract any particles after the 1st oil change. Dropped the oil pan, cleaned up the pan and put a new pan gasket and refilled the oil, replaced my turbo, oil cooler and rubber oil lines and away I went. It was fine for the 2 years I drove it afterwards and then I sold it.
Unfortunately that's the kind of thoroughness you have to have with a turbo failure....well done.
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Unread 2014-09-18, 11:37 PM   #8
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So yeeeaaaah. I figured it would be a good idea to at least change the oil a few times, so she took it to a local Firestone with a steep coupon and a Blackstone Labs oil sample bottle in hand, and instructions to have the tech save the oil filter for me to look at. Upon looking at the oil sample, the tech told her that if he didn't already know it had suffered a turbo failure, he'd warn her something was terribly wrong.

I could see a few small shards of metal in the filter just looking at it through the bag. Some silvery colored, some bronze. More when I cut it apart and spread it open. I shook the sample bottle and took a look inside, and there are flakes of silvery metal in it. So I'm putting a stop-drive order on it except to take it to a nearby shop and see if I can get them to flush the system as described above.

We drove it 100 miles or so after the initial failure, and another 240 since it was repaired. Hopefully it isn't totally fucked.

Edit: First I'm going to lean on the dealership and see what kind of warranty is on the engine after the turbo repair, because any damage to its bearings is a direct consequence of the turbo failure, and if the repair doesn't adequately account for that, it shouldn't be on the customer.

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Unread 2014-09-19, 04:06 PM   #9
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Quote:
Originally Posted by MFE View Post
So yeeeaaaah. I figured it would be a good idea to at least change the oil a few times, so she took it to a local Firestone with a steep coupon and a Blackstone Labs oil sample bottle in hand, and instructions to have the tech save the oil filter for me to look at. Upon looking at the oil sample, the tech told her that if he didn't already know it had suffered a turbo failure, he'd warn her something was terribly wrong.

I could see a few small shards of metal in the filter just looking at it through the bag. Some silvery colored, some bronze. More when I cut it apart and spread it open. I shook the sample bottle and took a look inside, and there are flakes of silvery metal in it. So I'm putting a stop-drive order on it except to take it to a nearby shop and see if I can get them to flush the system as described above.

We drove it 100 miles or so after the initial failure, and another 240 since it was repaired. Hopefully it isn't totally fucked.

Edit: First I'm going to lean on the dealership and see what kind of warranty is on the engine after the turbo repair, because any damage to its bearings is a direct consequence of the turbo failure, and if the repair doesn't adequately account for that, it shouldn't be on the customer.
Honestly as I see that situation, it's a question of - do they repair or are they parts re-placers? - I'd ask the manager that very question - Do you Repair cars? - when he answers yes - then ask him why you got just a part replaced and not a repair?

GL man. sucks that it eated a turbo.
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Unread 2014-09-19, 05:27 PM   #10
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"consequential damage" is the catch phrase you are going to want to use with a dealers service manager. "i'm going to fist fuck you in to next week" is what you go to after the first doesn't work.
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Unread 2014-09-20, 03:15 PM   #11
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So I'm in the process of 5 oil changes in a row with 5-10 miles driving inbetween. Putting 1/2 quart of Marvel Mystery Oil in with each one, and as of now, it's all coming out looking pretty good.
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Unread 2015-02-02, 07:33 PM   #12
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Bump, CX-7 still alive?
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