Issues with 06 STi Tranny

rbahr · 04-08-2007, 08:53 PM

My 06 STi has 1400 miles (not 14k...) and I just had the tranny apart.

I found this:

and this

This is the dual tapered bearing at the end of the main shaft sfter 6th gear. There is damage showing. Why would this happen on essentially a new car? There were no mods or hard starts or hard shifts, all OEM fluids...

TIA

Ray

krazyk1371 · 04-08-2007, 09:44 PM

Looks like the salesmen where having fun with your car during their lunch breaks before you bought it.

purreplayya69 · 04-08-2007, 09:45 PM

^^ yeup or some1 who test drove it had a lot of fun with it.... how many miles were on the car when you bought it?

rbahr · 04-09-2007, 06:47 AM

The car had less than 100 miles when I got it...

Ray

C-Nears · 04-09-2007, 07:53 AM

Quote:

Originally Posted by rbahr

The car had less than 100 miles when I got it...

Ray

Nuff said. 100 miles of pure hell

rbahr · 04-09-2007, 07:13 PM

Tires were in good shape, I kinda doubt that this could have been caused in less that 100 miles. This bearing is on the main shaft - could the main shaft be as a friend of mine says 'buggered'?

TIA

Ray

boost_happy · 04-09-2007, 07:16 PM

My car had 26 miles on it and I worry about what happened during those miles because 26 miles of abuse is a ton. These cars need a very tame break in and it worries me that I might reep the raping break in, later in time, but I know I'll just replace whatever it is with something better to begin with, so

purreplayya69 · 04-09-2007, 07:22 PM

mine had 130 miles on it when i bought (i got an 05 at the end of february in 06)

no problems knock on woood

jays05 · 04-09-2007, 07:29 PM

Um. Factory defect?

PowerLabs · 04-09-2007, 07:31 PM

Looks like what happens when you run the wrong kind of oil through it...
But since you said OEM fluids... Then I have no idea.

***Wes*** · 04-09-2007, 10:04 PM

dang thats no good

STI Tiff · 04-09-2007, 10:31 PM

I don't even know what I'm looking at, can some one school me please.

cusco · 04-09-2007, 10:56 PM

why did you take apart your tranny at 1400 miles??? should't you still be breaking her in?? lol

mxpop · 04-09-2007, 11:10 PM

^^^ yeah, why is your tranny apart (by you!) at this mileage anyway? I doubt that the markings on your bearings would have made any noise that can be heard over all the other normal noises.

Unlike rings, roller bearings dont really need to break in. They may seat in a little bit and free up a bit after a few heat/stress cycles but actual break in is not an issue.

In motocross race bikes, there is a recomended 15 minute ring/piston seating period after a rebuild but nothing as far as the bearings etc are advised (and they have both ball and roller style bearings).

Since you had proper (oem) oil, I would say that the markings are either from some type of contamination/foreign object or due to less that proper assembly/manufacturing techniques. As a preloaded style bearing, it is possible that the preload wasnt set correctly or that the machining is slightly off. As bad as that looks, I doubt that you would have had any kind of actual "failure" due to that bearing alone.

Keep us updated and tell us the whole story...

Ecmdrw5 · 04-10-2007, 02:57 PM

How deep are those marks or are they just visual? If it's just visual don't worry about it but if they have depth to them then you have a problem. I work at a machine shop and we rebuilt some sort of machine for the paper mill that had a similar problem. The wear pattern around it was uneven. The guy that worked on it decided it was caused by the shaft being unbalanced and also discovered that the bearings would stick at higher speeds causing them to grind instead of roll. But i don't know if that would be the problem on your car.

Added

Maybe their is something, like a small metal shaving or something loose in there causing damage.

04-08-2007, 08:53 PM	#1
rbahr Junior STI Driver Car: Grey 06 STi Posts: 56 IWSTI Addict since: Dec 2005 Trader Rating: (0)	Issues with 06 STi Tranny My 06 STi has 1400 miles (not 14k...) and I just had the tranny apart. I found this: and this This is the dual tapered bearing at the end of the main shaft sfter 6th gear. There is damage showing. Why would this happen on essentially a new car? There were no mods or hard starts or hard shifts, all OEM fluids... TIA Ray This ad is not endorsed by this member. Please register or login to hide this ad.

04-10-2007, 02:57 PM	#15
Ecmdrw5 Lurker Posts: 5 IWSTI Addict since: Mar 2007 Trader Rating: (0)	How deep are those marks or are they just visual? If it's just visual don't worry about it but if they have depth to them then you have a problem. I work at a machine shop and we rebuilt some sort of machine for the paper mill that had a similar problem. The wear pattern around it was uneven. The guy that worked on it decided it was caused by the shaft being unbalanced and also discovered that the bearings would stick at higher speeds causing them to grind instead of roll. But i don't know if that would be the problem on your car. Added Maybe their is something, like a small metal shaving or something loose in there causing damage. This ad is not endorsed by this member. Please register or login to hide this ad.

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04-08-2007, 09:44 PM	#2
krazyk1371 Professional STI Racer Car: '06 WRB/Silver STI Fav Mod: Kartboy Gear Location: San Marcos, Ca. Posts: 701 IWSTI Addict since: Mar 2006 Trader Rating: (1)	Looks like the salesmen where having fun with your car during their lunch breaks before you bought it.

04-08-2007, 09:45 PM	#3
purreplayya69 The Next Petter Solberg Car: 2005 CGM/Gold STi Fav Mod: Rocken the 08 nissan sentra! Location: NNJ Posts: 998 IWSTI Addict since: Dec 2005 Trader Rating: (12)	^^ yeup or some1 who test drove it had a lot of fun with it.... how many miles were on the car when you bought it?

04-09-2007, 06:47 AM	#4
rbahr Junior STI Driver Car: Grey 06 STi Posts: 56 IWSTI Addict since: Dec 2005 Trader Rating: (0)	The car had less than 100 miles when I got it... Ray

04-09-2007, 07:13 PM	#6
rbahr Junior STI Driver Car: Grey 06 STi Posts: 56 IWSTI Addict since: Dec 2005 Trader Rating: (0)	Tires were in good shape, I kinda doubt that this could have been caused in less that 100 miles. This bearing is on the main shaft - could the main shaft be as a friend of mine says 'buggered'? TIA Ray

04-09-2007, 07:16 PM	#7
boost_happy Professional STI Racer Car: 06 STI SGM Fav Mod: seatbelts Location: Dallas Posts: 687 IWSTI Addict since: Feb 2006 Trader Rating: (3)	My car had 26 miles on it and I worry about what happened during those miles because 26 miles of abuse is a ton. These cars need a very tame break in and it worries me that I might reep the raping break in, later in time, but I know I'll just replace whatever it is with something better to begin with, so

04-09-2007, 07:22 PM	#8
purreplayya69 The Next Petter Solberg Car: 2005 CGM/Gold STi Fav Mod: Rocken the 08 nissan sentra! Location: NNJ Posts: 998 IWSTI Addict since: Dec 2005 Trader Rating: (12)	mine had 130 miles on it when i bought (i got an 05 at the end of february in 06) no problems knock on woood

04-09-2007, 07:29 PM	#9
jays05 Spec C Club Car: Blue 05 STI Fav Mod: 4th gear wheelspin Location: Upstate NY Posts: 2,096 IWSTI Addict since: Nov 2004 Trader Rating: (0)	Um. Factory defect?

04-09-2007, 07:31 PM	#10
PowerLabs Professional STI Driver Car: 2006 Corvette Z-51 Fav Mod: Buying a new car. Location: All around the US Posts: 427 IWSTI Addict since: Mar 2007 Trader Rating: (0)	Looks like what happens when you run the wrong kind of oil through it... But since you said OEM fluids... Then I have no idea.

04-09-2007, 10:04 PM	#11
*Wes* I'm Jim Halpert Car: 06 WRB STI Fav Mod: EWG Location: Irvine, Ca Posts: 6,895 IWSTI Addict since: Apr 2006 Trader Rating: (9)	dang thats no good

04-09-2007, 10:31 PM	#12
STI Tiff Professional STI Driver Car: 06 STI Location: Southern California Posts: 419 IWSTI Addict since: Jun 2006 Trader Rating: (5)	I don't even know what I'm looking at, can some one school me please.

04-09-2007, 10:56 PM	#13
cusco Professional STI Racer Car: 2006 Aspen White STi Location: Cackramento, CA Posts: 843 IWSTI Addict since: Jul 2006 Trader Rating: (0)	why did you take apart your tranny at 1400 miles??? should't you still be breaking her in?? lol

04-09-2007, 11:10 PM	#14
mxpop Spec C Club Car: '06 STI Fav Mod: air freshener!!! Location: Santa barbara area Posts: 2,301 IWSTI Addict since: Jan 2006 Trader Rating: (2)	^^^ yeah, why is your tranny apart (by you!) at this mileage anyway? I doubt that the markings on your bearings would have made any noise that can be heard over all the other normal noises. Unlike rings, roller bearings dont really need to break in. They may seat in a little bit and free up a bit after a few heat/stress cycles but actual break in is not an issue. In motocross race bikes, there is a recomended 15 minute ring/piston seating period after a rebuild but nothing as far as the bearings etc are advised (and they have both ball and roller style bearings). Since you had proper (oem) oil, I would say that the markings are either from some type of contamination/foreign object or due to less that proper assembly/manufacturing techniques. As a preloaded style bearing, it is possible that the preload wasnt set correctly or that the machining is slightly off. As bad as that looks, I doubt that you would have had any kind of actual "failure" due to that bearing alone. Keep us updated and tell us the whole story...