"Offerup/letgo" $140 dressed mystery motor teardown & rebuild
07-13-2018, 12:18 AM
#26
Disassembled the engine the rest of the way this evening.... doesnt look too good. Found the primary reason why the engine was toast. Will be uploading a few dozen pictures tomorrow with my findings.
Also, id like assistance finding the best deals on new or used replacement parts where applicable, if anyone doesnt mind assisting. Have a good evening everyone, check back in with yall tomorrow.
Also, id like assistance finding the best deals on new or used replacement parts where applicable, if anyone doesnt mind assisting. Have a good evening everyone, check back in with yall tomorrow.
07-13-2018, 06:02 AM
#27
What am I doing here?
Join Date: Mar 2006
Location: 2017 Miata RF Launch Edition
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We've given you our best idea. My second best is to look up part numbers and then google the part number. More and more Mazda dealers are using a specific ecommerce package from Revolution Parts and it's driving down prices. Google does a good job of indexing them so that's a good bet.
07-13-2018, 10:43 AM
#31
What am I doing here?
Join Date: Mar 2006
Location: 2017 Miata RF Launch Edition
Posts: 3,606
Received 649 Likes
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So, going to need a new housing and rotor there, eh?
Damn, those are chowdered all to hell. Any idea what it ate?
Damn, those are chowdered all to hell. Any idea what it ate?
Last edited by NotAPreppie; 07-13-2018 at 10:48 AM.
07-13-2018, 10:59 AM
#32
If I am wrong about any of this please correct me. I need...
New bearings, bushing and the plate that are assembled into the front stationary gear
New bearing in the rear stationary gear
Eccentric shaft
front rotor
At least one, maybe two housings
Irons if these are fubar'ed when they get inspected for step wear or other issues
I'm thinking it might be better to slap this thing back together and use it as a core, even though (almost) all the seals would be reusable, the major components requiring replacement make up at this point about 70% of the motor. I might get lucky and find replacement parts super cheap though, especially since some of these things sell dirt cheap used and would be acceptable to use in a rebuild.
07-13-2018, 11:12 AM
#33
07-13-2018, 12:06 PM
#34
This is one place that I have found with a little better pricing then most. If anyone wants to list the price for a housing from MMD for comparison it would be appreciated. The below dealer has the housings listed for N3H1-10-B10C for $665/ea.
https://www.mazdabestpartsonline.com...yAAEgJTtvD_BwE
https://www.mazdabestpartsonline.com...yAAEgJTtvD_BwE
07-14-2018, 07:37 AM
#35
Water Foul
But how are the pistons?
That is the cleanest tear-down I think I have ever seen. Is it a recent rebuild? If not, it must have been steam cleaned by a coolant seal failure. Or maybe, just maybe... Seafoam works?!
[Edit]
I just read your WOT and see it is a recent "rebuild". I would say your assessment is correct. It is probably more valuable as a core exchange than it is as a parts donor. It is very difficult for a first timer to rebuild a rotary successfully for the $3000 that a reman costs. I would bolt it back up and exchange it, personally.
.
That is the cleanest tear-down I think I have ever seen. Is it a recent rebuild? If not, it must have been steam cleaned by a coolant seal failure. Or maybe, just maybe... Seafoam works?!
[Edit]
I just read your WOT and see it is a recent "rebuild". I would say your assessment is correct. It is probably more valuable as a core exchange than it is as a parts donor. It is very difficult for a first timer to rebuild a rotary successfully for the $3000 that a reman costs. I would bolt it back up and exchange it, personally.
.
Last edited by Steve Dallas; 07-14-2018 at 08:46 AM.
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Jedi54 (07-20-2018)
07-19-2018, 09:46 AM
#37
My apoligies for the lack of updates and of commenting on my findings, its been very busy at work lately and at home so i havent had the time yet. I am however going to Palm Tree Rotary this morning and getting the parts inspected for reusability
07-19-2018, 03:06 PM
#38
Verdict from Palm Tree Rotary this morning;
Reusable parts include: Rear Rotor
...
And that's it.
Motor will be reassembled and used as a Mazda core.
A new teardown thread will be created for the motor currently in my car that still runs with low compression. Will update with exact damage found later on. Thank you all for coming to view the results of this teardown. Luck just wasn't on my side this time when it comes to the core motor condition itself.
Reusable parts include: Rear Rotor
...
And that's it.
Motor will be reassembled and used as a Mazda core.
A new teardown thread will be created for the motor currently in my car that still runs with low compression. Will update with exact damage found later on. Thank you all for coming to view the results of this teardown. Luck just wasn't on my side this time when it comes to the core motor condition itself.
07-20-2018, 08:59 AM
#40
RX-Heaven
iTrader: (6)
Thank you for sharing the pics of the teardown. It's always neat to see what caused the engine to fail. This one appears to be a Mazda reman which you are aware of. I wonder if Mazda was the last to rebuild it or if the person that rebuilt it left the reman tag on it. For what you paid I still think you did well.
07-20-2018, 01:19 PM
#42
Administrator
iTrader: (7)
damn Xero, was really rooting for there to be more usable parts but doesn't look like it would be worth rebuilding that motor. 
The following users liked this post:
Jedi54 (07-21-2018)
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