Turbo Disassembly Question

[krazy86t]

Garrett TA49 turbo that needs a rebuild. following the steps on gnttype

removed exhaust and compressor housings, and now trying to remove compressor wheel from turbo shaft. the hex head on the exhaust side of the shaft was heavily ground down (i assume for balancing), so i only have a small portion of a flat side of the hex head to grab in a vice. (three sides of the hex have a full flat edge, but the other opposing sides are either partially gone or totally gone). nut on compressor side is not breaking free, and i'm thinking i may end up destroying the remaining bit of the shaft hex head getting the compressor wheel nut removed. how can i get this apart without destroying the ground down hex end of the exhaust side of the shaft? thx

 

[TRYMYSIX]

You have access to air tools? I had the same problem... I grabbed my hot side wheel with a pair of leather gloves, used a impact gun and it spun right off without hardly moving the hot side wheel. The compressor wheel is only torqued to only 20-in lbs or so....

 

[krazy86t]

my problem was simple - failed to detect LH threads. came off easily once i loosened the nut rather than tightening - duh.

 

[bison]

The compressor wheel is only torqued to only 20-in lbs or so....

Its torqued well beyond 20 inch pounds.

 

[joey316g]

Its torqued well beyond 20 inch pounds.

x2...its 20 inch lbs plus a 90 degree turn. air gun is the bst way or see if you can have somewbody hold the center section while you clamp the ground up side with a vise....lightly of course. If you are interested..I did a How To on this in the How To section.

 

[TRYMYSIX]

Its torqued well beyond 20 inch pounds.

I know it's 20 in lbs+90degree turn. But is there a certain # that it's supposed to be? I'm rebuilding my stock one now.

 

[joey316g]

the only spec I could find was that one....I am willing to guess its around 15-18 ft lbs based on the diameter of the threads....stick with the 20 inch lbs plus 90

 

[krazy86t]

Joey316g, thanks for mentioning your how to section - very useful!

several of my parts look different - i guess Limit Engineering differences. Plus the shaft has significant scoring - easy to feel with finger nail on both bearing surfaces.

 

[joey316g]

Joey316g, thanks for mentioning your how to section - very useful!

several of my parts look different - i guess Limit Engineering differences. Plus the shaft has significant scoring - easy to feel with finger nail on both bearing surfaces.

Yes...thats the 360 degree thrust bearing and dynamic seal. Its a modification they perform. If your shaft is bad, you can have it ground and youll have to obtain a bearing set with a smaller id. They do make them. That or replace the trubine/shaft and have it rebalanced.

 

[krazy86t]

Yes...thats the 360 degree thrust bearing and dynamic seal. Its a modification they perform. If your shaft is bad, you can have it ground and youll have to obtain a bearing set with a smaller id. They do make them. That or replace the trubine/shaft and have it rebalanced.

Is the round part in the upper left corner of bottom photo (inside oring) the "dynamic seal"?

Dumb question: is the thrust bearing the notched circular piece that bolts to the CHRA housing, or is that the thrust bearing collar?

 

[joey316g]

Is the round part in the upper left corner of bottom photo (inside oring) the "dynamic seal"?

Dumb question: is the thrust bearing the notched circular piece that bolts to the CHRA housing, or is that the thrust bearing collar?

yes teh circular notxhed piece is the thrust bearing...the other part is the dynamic seal and thrust collar...its a combination on this setup

 

[bison]

That turbine is shot if it's scored on the journal. I can get you new Garrett parts if you need them and have them balanced if you send me the comp wheel. Chances are the bearing housing is shot also if the turbine is that bad.

 

[joey316g]

That turbine is shot if it's scored on the journal. I can get you new Garrett parts if you need them and have them balanced if you send me the comp wheel. Chances are the bearing housing is shot also if the turbine is that bad.

Bison, can you get a new turbine wheel/shaft for our stock exhaust housings? How about compressor wheels?. I have another turbo I want to do but im having a hell of a time finding hard parts for the stockers. Have any part numbers for these? Thanks

 

[krazy86t]

That turbine is shot if it's scored on the journal. I can get you new Garrett parts if you need them and have them balanced if you send me the comp wheel. Chances are the bearing housing is shot also if the turbine is that bad.

interested. Limit Eng claims to have oversize bearings in 0.005" 0.010" and 0.015", so maybe the shaft can be ground/polished. They also stated that the wheels are individually balanced.

How can you tell if the center housing is shot. too much bearing play?

bought this turbo from someone understanding that there was shaft play and it needed rebuild. shaft play was significant.

 

[87GN_70GS]

It is very common to have the shaft turned down just like what is done on a crankshaft. Then you pick the appropriate ID sized bearing. If I am not mistaken, you can also machine the housing, have it mic'ed to check, and select the appropriate bearing OD to fit. The local diesel/injection shop balances the rotating assembly bolted together (it's marked for reassembly)

 

[bison]

interested. Limit Eng claims to have oversize bearings in 0.005" 0.010" and 0.015", so maybe the shaft can be ground/polished. They also stated that the wheels are individually balanced.

How can you tell if the center housing is shot. too much bearing play?

bought this turbo from someone understanding that there was shaft play and it needed rebuild. shaft play was significant.

The shaft would need to be ground and on these small turbos it's not cost effective to do so. The compressor wheel and turbine should be balanced as an assembly.

 

[bison]

I can supply you with a new balanced cartridge with Garrett wheels for $440 shipped.

 

[krazy86t]

I can supply you with a new balanced cartridge with Garrett wheels for $440 shipped.

I'm unsure what is meant by "balanced cartridge" - what does that include? What parts are still required to complete the turbo starting with "balanced cartridge"? thx

 

[bison]

I'm unsure what is meant by "balanced cartridge" - what does that include? What parts are still required to complete the turbo starting with "balanced cartridge"? thx

You would need to use your compressor cover and ex housing bolts and clamps and any brass fittings from your old turbo. It's an assembled center section with all new parts including new wheels and the wheels are balanced together

 

[krazy86t]

You would need to use your compressor cover and ex housing bolts and clamps and any brass fittings from your old turbo. It's an assembled center section with all new parts including new wheels and the wheels are balanced together

pretty close to complete turbo. Would the cartridge internals have 360 deg thrust bearing and dynamic seal for compressor plate? TA49 size wheels?