Can a novice rebuild a 6 speed? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-05-2014, 07:13 AM   #1
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I need to replace the front section of my 6 speed case due to shipping damage... I have torn down an engine before, done clutches brakes, suspension work... But have never torn apart a transmission. Is it reasonable that someone with basic mechanical skills and tools can tear down a 6 speed and rebuild it? Or would I need specialized tools and equipment?

Keith
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Old 07-05-2014, 10:50 PM   #2
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Torn down an engine...and rebuilt it? The teardown is easy lol. I build transmissions for a living, but have never built an engine. That has always seemed intimidating, but I don't think I'd have a problem with it as long as I had some good info now that I've gotten over my fear of trannies

I have an official Mazda 6spd rebuild manual in PDF if you want to have a look. You can decide based on what you see. The process is really well documented there, looks like all you'll need is a puller, pin punch, vise...nothing out of the ordinary. No press is required to reassemble, as long as you are not disassembling individual clusters while you are in there. I bet you could knock it out in a weekend taking your time and didn't get too buzzed in the process.

Edit: I'll add that I've never rebuilt a Miata trans, so I can't comment directly on the process. I'm uploading the PDF to my dropbox, I'll post a link once it is ready.

https://dl.dropboxusercontent.com/u/...d%20Manual.pdf

Last edited by matthewdesigns; 07-05-2014 at 11:44 PM.
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Old 07-16-2014, 01:31 PM   #3
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Yep, than manual is the key, I am using it myself soon.

My project will probably be replacing synchros only. Never torn into a trans at all before.

Crappy cell pics to come.
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Old 07-16-2014, 02:30 PM   #4
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The only really specialized tool I used was a hydraulic press large enough to fit the tranny in to press on one of the gears. I think I fabricated one puller as well. I called Mazdaspeed motorsports about some of the special shop tools in the manual and they cost allot and take 8 weeks to get.
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Old 07-16-2014, 03:29 PM   #5
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I've done stacks of engines, suspension, etc. My buddy has done bunches of trannies (ford, etc)... We both thought the mazda one was a big huge PITA.

I definitely needed some crazy, reverse threaded puller thing that I made on the lathe, and they tell you to use some tool which is just a spacer to get some parts aligned... without giving you an actual distance spec. Oh, and there's one part where there is NO indication which side goes up... I guessed, guessed wrong, and had to get it off.

Basically, sure, you can do it. It's kinda a big pain job, I'd rather do 4 engines than one tranny, perhaps that's the best way to put it. If you're just popping the end off, it's really no big deal though. If there's a cool shop around who'll do one or two of the specialty parts for you (using a special puller or press) it wouldn't be too bad - but if they want $100 per time they help you out you might as well have them do it.

Far from impossible, but it could take a bit. Oh, and the parts kinda add up if you want to freshen everything.
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Old 07-16-2014, 06:48 PM   #6
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Quote:
Originally Posted by AbeFM View Post
I've done stacks of engines, suspension, etc. My buddy has done bunches of trannies (ford, etc)... We both thought the mazda one was a big huge PITA.

I definitely needed some crazy, reverse threaded puller thing that I made on the lathe, and they tell you to use some tool which is just a spacer to get some parts aligned... without giving you an actual distance spec. Oh, and there's one part where there is NO indication which side goes up... I guessed, guessed wrong, and had to get it off.

Basically, sure, you can do it. It's kinda a big pain job, I'd rather do 4 engines than one tranny, perhaps that's the best way to put it. If you're just popping the end off, it's really no big deal though. If there's a cool shop around who'll do one or two of the specialty parts for you (using a special puller or press) it wouldn't be too bad - but if they want $100 per time they help you out you might as well have them do it.

Far from impossible, but it could take a bit. Oh, and the parts kinda add up if you want to freshen everything.
I used a large press to do the thing the crazy reverse threaded puller/installer thing did. worked just fine. The threads on that thing were just wierd like very uncommon 11mm left handed and an odd pitch as well if I remember.
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Old 08-06-2014, 08:01 PM   #7
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Took it to a rebuild shop SE of Indianapolis, they tried just taking the front half of the case off and swapping it, but there is one bolt that goes through a moving internal part that is impossible to line up with the back half of the case in the way. So they have to do a complete teardown. Good news is that the insurance from UPS will be coming through in a week to ten days.

Later,

Keith
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Old 08-07-2014, 11:44 AM   #8
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Which shop? Was it the shop of the guy I gave you? He's like a friend of a friend of a friend or something so I don't even know him. Just curious in case I ever need a rebuild.
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Old 08-07-2014, 11:48 AM   #9
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Quote:
Originally Posted by thenuge26 View Post
Which shop? Was it the shop of the guy I gave you? He's like a friend of a friend of a friend or something so I don't even know him. Just curious in case I ever need a rebuild.
Note to self: Take referrals from thenuge26 with a grain of salt
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Old 08-07-2014, 12:35 PM   #10
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Haha I did tell him that in advance at least. And he did fine rebuilding my friend's 5-speed.
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Old 08-07-2014, 01:18 PM   #11
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I didn't know you were going to rebuild that thing. One of my buddies works at a hole in the wall place on the Souf Side.
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Old 08-07-2014, 08:29 PM   #12
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Quote:
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Which shop? Was it the shop of the guy I gave you? He's like a friend of a friend of a friend or something so I don't even know him. Just curious in case I ever need a rebuild.
I forgot all about your reference, didn't realize he works at a shop... thought he was just an enthusiast and since I needed a shop for an official repair estimate for the insurance from UPS I skipped over anyone that I thought wasn't working for an actual transmission shop. Ended up using Trans Gear Performance Inc. just south of Indianapolis in Beach Grove.

Keith
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Old 08-07-2014, 08:33 PM   #13
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I didn't know you were going to rebuild that thing. One of my buddies works at a hole in the wall place on the Souf Side.
Are they located in Beach Grove? South of Indianapolis toward the east a bit.

Keith
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Old 08-07-2014, 08:38 PM   #14
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That's not the place i was thinking of, haven't heard of them. The one i was talking about is off of Southport somewhere out near Acton.
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Old 08-19-2014, 01:15 PM   #15
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With the 6 speed and 4.3 rear end I find myself using it as a 3 speed around town, 2, 4, and 6 are all I need for casual driving. For "spirited" driving I use all gears now naturally aspirated. I am wondering if I would do well to start off in 2nd after I have boost?

Keith
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Old 08-19-2014, 08:08 PM   #16
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6 speed with a 4.3? How's that 4300 rpm freeway drive?
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Old 08-19-2014, 08:25 PM   #17
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6 speed with a 4.3? How's that 4300 rpm freeway drive?
At 70 mph by GPS (72.5 mph indicated on speedometer, approx 4000 RPM) I was able to pull a best of 25 mpg on E85, so no complaints. I wear ear buds to listen to music or podcasts on my phone when driving anyway, and the ones I use are from "the earplug superstore". They are 20dB rated earplugs with built in earbuds

At 80 mph by GPS (82.5 mph indicated on speedometer) I still got a best of 23 mpg on E85 at around 4500 RPM.

Keith

PS: Speedometer has always been off by 2.5 mph... not sure why.
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Old 08-19-2014, 11:35 PM   #18
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Lucky bastard. I'm from a complicated state.
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Old 08-20-2014, 01:11 AM   #19
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Did I mention that they come in skin tone for light or dark complexion? I would not hesitate to use them in a "complicated" state. I also treat stop lights like a stop sign if nobody is around... No turn without a green arrow? Not if I am behind the wheel.

Keith
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Old 11-15-2014, 09:12 PM   #20
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Thanks for the link looked everywhere for one
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