What breaks companion flanges?
After breaking the 5-speed in my 99 at Laguna in April, I put in an MSM 6-speed and a 3.9. Well, the 3.9 sucks, so I bought the 3.636 gears and swapped it for the 4.3 gears that were in the original diff from the car.
When taking the diff off, I noticed the companion flange was broken: http://www.codrus.com/miata/diff/companion-broken.jpg Here's what it's supposed to look like: http://www.codrus.com/miata/diff/companion-fixed.jpg The cross-shaped thingey (cast iron) is held to the flange with rubber -- presumably it's some kind of vibration damper? What kills them? It was fine a couple years ago when I put the new motor in the car, and it's only had about 6000 miles since then. I didn't notice any particular vibration in the car before I blew up the transmission. --Ian |
Because race car?
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No idea but most people remove those anyways.
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Pretty much because race car. The rubber used to bond the thing just isn't designed for what we do. It's only there to dampen small drivetrain vibrations and improve NVH, so removing it isn't a problem.
When they actually come fully loose, the vibration at 140mph is amazing. The 3.63:1 hi-power OS Giken that's going into Theseus has the little dongus removed. |
Originally Posted by Savington
(Post 887103)
Pretty much because race car. The rubber used to bond the thing just isn't designed for what we do. It's only there to dampen small drivetrain vibrations and improve NVH, so removing it isn't a problem.
When they actually come fully loose, the vibration at 140mph is amazing. The 3.63:1 hi-power OS Giken that's going into Theseus has the little dongus removed. I guess I didn't need to buy a new one to put in, ah well. I got ~ 50 track days out of the first one, and at the rate I'm making it to the track these days if the second one goes the same distance then I've got a long time before I need to worry about it again. --Ian |
What kills vibe dampers are vibes much larger than they are designed for.
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Hey wasn't there a story about some Mustang doofus who disabled his speed limiter and broke his prop shaft at 140 mph?
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Mine is loose, how do I remove it completely? Drill it?
Drive shaft is out anyway... |
You might be able to cut it off, but I just removed the pinion flange.
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Per the tech at the rear end shop who put in my 3.636 gears, R&Ring the pinion flange requires remeasuring the bearing backlash and preload, but not the pinion depth.
I don't think you could fit a cutoff wheel in there without also hitting either the diff housing or the flange. Maybe if you drilled a hole and then used a dremel with a grinder to cut sideways. --Ian |
Originally Posted by codrus
(Post 887953)
Per the tech at the rear end shop who put in my 3.636 gears, R&Ring the pinion flange requires remeasuring the bearing backlash and preload, but not the pinion depth.
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Originally Posted by codrus
(Post 887953)
Per the tech at the rear end shop who put in my 3.636 gears, R&Ring the pinion flange requires remeasuring the bearing backlash and preload, but not the pinion depth.
I don't think you could fit a cutoff wheel in there without also hitting either the diff housing or the flange. Maybe if you drilled a hole and then used a dremel with a grinder to cut sideways. --Ian |
Originally Posted by Spookyfish
(Post 888010)
What does this even mean?
Writeup on doing the backlash and bearing preload: http://www.miata.net/garage/diff_rr.html Doing these measurements is the secret voodoo stuff that everyone says you should pay a shop to do, and the guy at that shop was of the opinion that I shouldn't R&R the companion flange later without redoing most of those measurements. He wasn't making any money on the flange replacement either (I was supplying parts that I bought from Mazdacomp). So, can you remove the flange to get rid of the loose cross-shaped weight without messing around with the guts of the diff? I dunno, but the guy at the shop who does this for a living told me no. --Ian |
Yes I'm bumping a super old thread...
Andrew I talked to you about this at MRLS this weekend. I keep getting different info from different people. I have a really old 4.10 torsen from an NA in the car right now, and this piece is totally loose and wobbling around. What exactly is involved in removing it? Some people say you need to disassemble the diff, and others say you can remove the driveshaft, take the big nut off, and remove it. Any guidance from someone who has done this would be greatly appreciated. thanks guys. |
Originally Posted by K Miata
(Post 1273549)
Yes I'm bumping a super old thread...
Andrew I talked to you about this at MRLS this weekend. I keep getting different info from different people. I have a really old 4.10 torsen from an NA in the car right now, and this piece is totally loose and wobbling around. What exactly is involved in removing it? Some people say you need to disassemble the diff, and others say you can remove the driveshaft, take the big nut off, and remove it. Any guidance from someone who has done this would be greatly appreciated. thanks guys. |
The problem is that the "big nut" holds the pinion gear into the differential, and if you don't torque it back down exactly the same, you can alter the pinion depth and mess stuff up. If it were my race car, I would want to at least check the pinion depth and backlash after removing the pinion flange.
Having said that, when it came loose at WSIR a few years ago, I jacked up the car, undid the nut, removed the guibo/dongus/damper, put the nut back in, and cranked it down as tight as I could with the tools on hand. |
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