I am posting this in the canada forum because this motor was purchased in canada .

First off I am surprised because I have heard so many stories about Mazda remanufactured being
questionable at best, that in many cases oil control rings, housings, and even apex seals get reused,
in mazdas rebuilt motors.

Over this last weekend I opened up a 6 port motor (1988) which had been remanufactured in 03
by who ever does mazdas rebuilds.
this motor had failed due to either over revving or lack of oil to cool the front rotor resulting in the
rotor bearing to spin, the motor has about 20,000klm on it and appeared to be in good shape from
its appearance from the out side.

After pulling the motor and removing the oil pan it became obvious that there was a bearing that was
in really bad shape, the piles of copper in the pan were very large!

Pulling off the front cover revealed a New oil pump chain, gears and what appears to be a new oil pump
as well as torrington bearings and plate.
The oil pan was even new! parts tag still attached!
Removing the tension bolts and getting into the business end of things also showed that it was built
with New oil control rings, apex seals, stationary gears and bearings, housings and corner seals,,,
and most surprising new 93+ corner seal springs!
The e shaft even appears to be new with a nice gold color to the exposed end where the new nut that
held on the new flywheel was.

The only thing that was reused but was still well within spec were the irons they showed some wear but
are in very good condition, I would reuse them as they are now.

so to all the people who have fears about what kind of quality you are getting with a
Mazda remanufactured engine can feel a little better knowing that at least one (that I have)
was of a Very good quality.
Now if you can get over the cost that mazda charges for the rebuilt motors they might be worth getting.
matt

 

to me it only makes sense that they would use basically all new parts, considering the price range that is being charged.
i can't see them trying to use used parts for things that should be new, let alone used parts that are out of spec.

but who knows, maybe you just got lucky.

 

Rebuilt in 03 and blown two years later.... Yep, definitely puts your mind at ease

 

heh, well from reading his post it sounds like it was an induced failure of one of the bearings.
no matter how well built an engine is, there is a way to screw it up like that. he mentioned over-revving and/or oil supply problems.
he didn't mention anything about the failure being caused by any specific part inside the engine.

 

Depends what area you're in.

Around Ottawa, I've heard that all the Mazda dealers send their engines to Rx7Heaven for reman. I don't know how true that is, but I wouldn't be willing to risk it!

Jon

 

^^^^
Agreed, god only knows how many he's had before putting an engine together. You might even find a beer bottle substituted for the E-shaft

 

For anyone who wants to know, there's the story of Mazda rebuilds as posted to the FC mailing list.

From: Marcus B.
Sent: February 22, 2004 2:14 AM
Subject: [fc3s_org] Re: Mazda rebuilt engines?

I asked to interview a manager and spend a few hours at the Irvine
California R&D center for an article on factory remanufactured
engines. I was told Mazda no longer rebuilds engines in Irvine.
Delco Remy has the remanufacturing contract and they do all the
work. All of the following miscellaneous ramblings about Mazda
remanufactured engines were correct as of October 2003.

When you buy a Mazda remanufactured engine no parts from an original
engine are specifically assembled to build another engine. When a
core comes in, all parts are spec'd, cleaned, and shelved. No
special engines (such as TII rotor housings on an NA, or Renesis
rotors in an S5 block) are available. Shelved parts are picked at
random for reuse during assembly of a remanufactured block. Out of
spec side housings are shipped to Japan to be lapped and re-nitrided.
Mazda only uses 1 lapped side housing in any remanufactured rotary
engine. Some engine builders boast that they lap all the side
housings, but do they re-nitride them as well? Hmmm. . . . . An
engine with a lapped side housing is scribed, and it is noted on the
build sheet. Customers never see build sheets as they are kept by
Mazda. The build sheet has a list of all the new parts that were used
on the engine, test results and the compression numbers. The build
sheet matches the serial number on the front of the block. Pry that
serial number off, and your warrantee is void. Rotor housings? Any
rotor housing that is out of spec is tossed. Mazda does not
remanufacture rotor housings. Some Mazda remanufactured engines have
two used rotor housings and rotors, some may come with both new
housings, and used rotors, some with new rotors and new housings, or
any combination you can think of. It all depends what is available
when the engine is assembled. Side seals on the rotor are custom
fit. These are custom seals in varying lengths that Mazda does not
sell to the public. Completed engines are run on a test stand and the
results are checked by machine. Engine vibration, oil consumption,
and a number of other things are noted on the build sheet. The
engines are run using a carburetor. The compression checks that are
done are not performed with the $1500 tester that dealers used to
have. Any remanufactured engine that does not meet spec is
disassembled and whatever is wrong is corrected. All engines are
shipped with a new/Mazda-rebuilt water pump, oil pump, flywheel, and
new exhaust studs are used. OK, that's enough for now.

As for the dealer that told you they could supply a Mazda
remanufactured engine for $1400, the price hasn't been that low for
ages. The counter person was probably speaking off the cuff. The
current retail price is closer to $2200 plus a core charge

If someone were to run an article on Mazda remanufactured engines,
would a large number of you read it? Roundel readers found this type
of thing interesting.

Marcus
89 GXL - 418,000 miles or so

 

I ran a Mazda Reman 1991 engine in my race car for 2 years. It was placed under the most severe use possible, on the rev limiter most of the time. The engine lost the main bearings at Mosport this spring, could have been an over rev or a oil failure or a coolant seal or another case of running the car too hard with oil and water temps too low. The blow-up was in no way Mazda's fault, it was mine, no thermostat, oil too crappy.

Anyways I have examined the motor and found that I can back up Aaron's info. This motor had 2 new housings, 2 new rotors and while 1 of the irons was new the others were lapped and re-nitrided. The oil pump/ chains looked new and even the oil pan looked new.

I was very happy with the performance of the motor as it allowed my car to be a top 5 Touring GT car with no other internal mods and a stock computor.

All I can say is that I now have a great core for the BP.

 

I've been running a Mazda remain for about 6 or 7 years (60k or so on it now) Its always ran great, no issues. It was expensive, but then again, its one less thing to worry about!

 

Mazdee's told me that the Mazda remanufactored housings come with new housings.

 

Your housing came with housings?!?

 

I would hope so

 

I would be pretty pissed if I spent money on an engine and didn't get housings with it.

by the way... "remanufactored" is spelled "Remanufactured" maybe we need to convince the mods of rx7club.com to turn on the spell check add on for the forum software....

 

Wow my spelling sucks. I mean mazdee's said all mazda motors come with "new" housings.

Anyhow not much difference between an O and a U! LOL You know what I was trying to type out!

 

Any idea if this is $$USD or $$CDN

 

Us.

 

wow if your not porting or anything that seems to be the way to go

 

Where do you your remans from? Is there a particular dealership in the GTA that you guys go to? If I wanted to buy a motor outright where can I go?


Thanks, Ed