Ah yes, another newbie with another broken MZ3 - Page 4 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #31 of 37 (permalink) Old 03-08-2016, 03:16 PM Thread Starter
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Not saying I've seen that happen a lot, but I have seen it several times; said another way, it is more common than you think. That said, I have *NEVER* seen the spun two-layer bearing thing happen and leave the rod end relatively unscathed, so this is a first for me too.
There might be lots of damage to the rod half of the bearing surface, I couldn't really see that, but the cap half was surprisingly..."relatively unscathed".

If I can find them I'll add pictures of the rod and crank bearing that I took out of my 150k mile 911 engine when I rebuilt it, you could eat off of them they were so clean.
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post #32 of 37 (permalink) Old 03-08-2016, 03:33 PM
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There might be lots of damage to the rod half of the bearing surface, I couldn't really see that, but the cap half was surprisingly..."relatively unscathed".

If I can find them I'll add pictures of the rod and crank bearing that I took out of my 150k mile 911 engine when I rebuilt it, you could eat off of them they were so clean.
Yeah, I meant to ask about the crank journal; did you perchance plastigauge the rod before you buttoned the engine back up?

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post #33 of 37 (permalink) Old 03-08-2016, 03:39 PM Thread Starter
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Yeah, I meant to ask about the crank journal; did you perchance plastigauge the rod before you buttoned the engine back up?
Not a chance! The crank surface looked like the rod cap surface, similar levels of scraping and oil discoloration, but no gouging, rings, or heat marks.
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post #34 of 37 (permalink) Old 07-28-2019, 11:15 PM Thread Starter
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So here we are, 3 years later.

I've been driving the Mazda daily for these three years, ignoring the various noises. No significant oil loss, down about 20% on power overall, but otherwise 3 years of driving.
Until a few weeks ago, when it went from fine to OMG over about 5 miles. I was able to get it home, but it's clear that either the wrist pin finally cracked, or the piston cracked, or it impacted a valve or something. Top end, nearly catastrophic damage. I will say that one diagnosis that I tried was interesting. Pulling power to the #1 coil made the noise MUCH worse and MUCH more metallic. I wonder if the piston was floating somewhat freely, and the pressure of detonation was keeping it somewhat stable. Remove the spark leads to removing the detonation leads to removing the pressure against the piston surface at TDC leads to something banging around more freely...

So...I bought a 2011 Ford Escape 2.5L engine and I'm halfway through the swap.

I've been driving the car instead of my vintage Porsche because it's surviving day to day driving better, the wife ended up buying a Subaru. We kept the Mazda because it had no trade in value, even though it is in really great shape other than the engine. So, give me 2 more weekends and you'll have another member of the 2.3L to 2.5L swap club!
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post #35 of 37 (permalink) Old 08-03-2019, 07:25 PM
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Wow, what an update. As I read the the first few pages I was sure that the car was long gone. Awaiting the end result!

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post #36 of 37 (permalink) Old 10-28-2019, 11:07 AM Thread Starter
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I asked for 2 or 3 weeks, I took 3 months, because we had a nasty hot summer...


I broke the Porsche, so I needed to get the Mazda back online. Got it buttoned up, turned the key, and it started on the first crank, NO ERROR CODES, no stumbling, perfect idle. I've run about 50 miles on it, and it seems 100% correct. Holy cow.


So, 2006 5-door 5 speed with the M-speed exhaust, 100,818 miles.

Ford 2.5L from a 2011 Escape, ~55k miles.
2008Milan intake adapter. All Mazda pieces and parts (including valve cover).
New clutch, new drive shafts.


No errors.


Now I need to tear into the 2.3L block and see what exactly I did to it.




so, who's made a set of badges for the 2.5L conversion cars? I can't have that 2.3 on my fenders anymore...maybe I'll try to prototype something, new fender badges and something for the tailgate.
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post #37 of 37 (permalink) Old 10-28-2019, 12:54 PM
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so, who's made a set of badges for the 2.5L conversion cars? I can't have that 2.3 on my fenders anymore...maybe I'll try to prototype something, new fender badges and something for the tailgate.
You could get the 2.5 badges for a newer 3 that has that engine. https://www.ebay.com/itm/10-11-12-13...kAAOSwghZdqdxW
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