What exactly does Mazda do when they reman a motor?
07-22-05, 02:34 PM
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What exactly does Mazda do when they reman a motor?
I have a reman motor from mazda that would put in right before the previous owner took ownership of the car, yet stupid things on the engine are still going wrong. TPS, coil pack, motor mounts...
07-22-05, 02:48 PM
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A reman usually means that most of the wear sensitve parts are changed out for new ones and the other main components are on a case by case basis. But the reman is the core only and doesnt include the items you listed.
07-22-05, 03:22 PM
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Here's an old post to the FC3S_ORG mailing list that covers the Mazda rebuild proces:
From: Marcus B. Fitzhugh
Sent: February 22, 2004 2:14 AM
To: fc3s_org@yahoogroups.com
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
From: Marcus B. Fitzhugh
Sent: February 22, 2004 2:14 AM
To: fc3s_org@yahoogroups.com
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
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