T25 Rebuild
#1
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T25 Rebuild
Hey guys,
So I've finally disassembled everything to take apart my turbo and rebuild it. It is an SR20 T25. I've read and compared notes of about 4 to 5 T25 rebuild articles and I have a few questions due to the discrepancies in the articles and the way my failed turbo was assembled. Mostly regarding the outer snap ring holding the turbine bushing in. Do I use a C-ring or that coiled piece of metal? Does the oil deflector plate (washer type thing) go on the inside or outside of the final retaining ring?
Which way is the right way?
1.
I disassembled mine and starting from the inside it was c-ring, bushing, oil deflector, coiled retainer.
2.
Brain's write-up states Funky wavy clip (c-ring), Gold bearing (bushing) Funky retaining clip (coiled retainer). No mention of the oil deflector being inserted here, but I believe he put it on the outside of the coiled retainer.
https://www.miataturbo.net/useful-saved-posts-8/rebuilding-t25-turbo-10996/
3.
This image shows that a c-ring is used and the oil deflector is on the outer. Part #2 and #3 on the turbine side. Not exactly sure what part #4 is.
4.
This guy does c-ring, bushing, c-ring, oil deflector and coiled retainer on the shaft. This guy is also a car guru in my area.
5.
This guy does it the same way I disassembled mine
I'm a bit worried that my CHRA/bearing housing will be damaged after seeing the scoring on my bushings. Do these bushings freely spin during normal operation? Yes, some holes are filled with molten metal
So I've finally disassembled everything to take apart my turbo and rebuild it. It is an SR20 T25. I've read and compared notes of about 4 to 5 T25 rebuild articles and I have a few questions due to the discrepancies in the articles and the way my failed turbo was assembled. Mostly regarding the outer snap ring holding the turbine bushing in. Do I use a C-ring or that coiled piece of metal? Does the oil deflector plate (washer type thing) go on the inside or outside of the final retaining ring?
Which way is the right way?
1.
I disassembled mine and starting from the inside it was c-ring, bushing, oil deflector, coiled retainer.
2.
Brain's write-up states Funky wavy clip (c-ring), Gold bearing (bushing) Funky retaining clip (coiled retainer). No mention of the oil deflector being inserted here, but I believe he put it on the outside of the coiled retainer.
https://www.miataturbo.net/useful-saved-posts-8/rebuilding-t25-turbo-10996/
3.
This image shows that a c-ring is used and the oil deflector is on the outer. Part #2 and #3 on the turbine side. Not exactly sure what part #4 is.
4.
This guy does c-ring, bushing, c-ring, oil deflector and coiled retainer on the shaft. This guy is also a car guru in my area.
5.
This guy does it the same way I disassembled mine
I'm a bit worried that my CHRA/bearing housing will be damaged after seeing the scoring on my bushings. Do these bushings freely spin during normal operation? Yes, some holes are filled with molten metal
#3
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Thanks.
#5
I doubt they are supposed to spin in the housing, because then the housing would be come a wear item as well as the shaft and bushing which would defeat the whole purpose of using a Bronze bushing as a sacrificial Metal ment to be replaced
I'd say the turbo got starved of oil or was overspun to do that damage
I'd say the turbo got starved of oil or was overspun to do that damage
#6
I doubt they are supposed to spin in the housing, because then the housing would be come a wear item as well as the shaft and bushing which would defeat the whole purpose of using a Bronze bushing as a sacrificial Metal ment to be replaced
I'd say the turbo got starved of oil or was overspun to do that damage
I'd say the turbo got starved of oil or was overspun to do that damage
#11
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My kit did not come with the oil deflector washer. Anyone know what size it is so I can just go buy one? Does this seal the oil in, or is it just a spacer?
The loose looking washer on the shaft from Brain's pic
The loose looking washer on the shaft from Brain's pic
#12
I have rebuilt my 5th turbo last night, and my kits never came with that either, but I successfully rebuilt all my turbos anyways. I bought a Garrett SR20 T25 off this site that has seen better days, it was loaded with carbon and scarred journal bearings, but the stock internals never had that deflector when I tore it apart. Put the new goodies in and runs like a champ @ already 1k miles since I installed it.
#14
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In my head it would prevent excessive oil from spraying out the piston ring...but I've never done this before.
So from the turbine wheel in, it's - piston ring, c-ring, bearing, c-ring? What does the seal plate on the exhaust side seal in, and how is it even held on?
Penguin, you didn't use the washer on all of your previous rebuilds either?
If you guys say so...I'm just a noob, so I'll follow what the old guys say.
So from the turbine wheel in, it's - piston ring, c-ring, bearing, c-ring? What does the seal plate on the exhaust side seal in, and how is it even held on?
Penguin, you didn't use the washer on all of your previous rebuilds either?
If you guys say so...I'm just a noob, so I'll follow what the old guys say.
#16
In my head it would prevent excessive oil from spraying out the piston ring...but I've never done this before.
So from the turbine wheel in, it's - piston ring, c-ring, bearing, c-ring? What does the seal plate on the exhaust side seal in, and how is it even held on?
Penguin, you didn't use the washer on all of your previous rebuilds either?
If you guys say so...I'm just a noob, so I'll follow what the old guys say.
So from the turbine wheel in, it's - piston ring, c-ring, bearing, c-ring? What does the seal plate on the exhaust side seal in, and how is it even held on?
Penguin, you didn't use the washer on all of your previous rebuilds either?
If you guys say so...I'm just a noob, so I'll follow what the old guys say.
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