turbo rebuild

[jmolina]

whenever i'm shopping for turbos, i come across some that are real cheap, for example a garret turbo for 50 bucks, but needs to be rebuilt.

My question is: how to rebuild a turbo? Cost? and is it reliable after a rebuild?

thanks for you help guys

[jmolina]

what does shaftplay mean?

[jmolina]

any help???

[Hondapawa]

I think shaftplay means that the bearings may be shot.. Well thats what we say at school when you can move a shaft in a gearbox or motor.. Good condition bearings wont allow the shaft to move in/out or any angular play. Some bearings does, but since i dont know what kind of bearings are in a turbo, i can't really help...

If you only have to change bearings, it will be really really cheap.. for the rest , i cant help you.

[civic_90_08]

there will be either journal bearings or Ball bearings.

[jmolina]

how expensive would be complete rebuild??

[musteredonme]

how expensive would be complete rebuild??

X2 im in the same boat

[Hondapawa]

how expensive would be complete rebuild??

Maybie you would get more luck on a forum for turbo setups or turbo shops... dunno

[bcjammerx]

Maybie you would get more luck on a forum for turbo setups or turbo shops... dunno

yeah cause there aren't any turbo builds here on our forum...and we don't even have FI section dedicated to just that either...boy I wish we did.

But really...on those other forums...man they will answer your question like a millisecond after you post it...they are soo fast you never have to patient or anything...cause they are ALWAYS on the site.

[CB7 Sleeper]

a turbo rebuild kit is usually $100 to $200 dollars, maybe more depending. It all depends on what kind of turbo it is and where you get it.

shaft play has to do with the bearings. you will need to replace them.

[jmolina]

thank u guys...i'll try those other forums dedicated to turbo builds.
those chinese turboes on ebay are tempting to buy, but i'm trying to refrian

i'll keep researching

[drummersteve7]

For the most part, if the turbo's compressor wheel still turns and has not hit the compressor housing it should be rebuildable.
To be absolutely sure the turbo needs to be disassembled and some internal inspection done. A bound shaft or any compressor
or turbine damage/housing contact pretty much constitutes a junk turbo! Don't throw it away! It can be used for a core exchange
on new turbo! It is best to remove the turbine housing first. This side is more difficult to remove. By keeping the compressor housing
on, it may protect the compressor wheel from possible damage while removing the turbine housing.

There are three main pieces of the turbocharger:
the turbine housing, or the hot side;
the center section, or CHRA (Center Housing and Rotating Assembly);
and the compressor housing, or the cold side.
Please take the time to mark or scribe the relationship of these assemblies to each other. I "thought" I'd remember how they
went back together but got the bracket that secures the turbo to the engine off by one bolt. I had to take the hot side all
apart to correct this!!!

Turbo Balancing
The purpose of doing it is to reduce vibrations/harmonics that could induce noise in the exhaust system. Balancing was not
done to/will not improve the performance of our turbos. Balancing is not need but will prolong the life of your turbo.

Does that help? Dependant on your turbo and how you wanna do the setup.
Do it right and you wont be disapointed!

[rgsh22accord]

rebuilding a turbo is alot easier than its seems like found that out first hand by watching d112crzy rebuild on in less than 30 min. just research on how 2 rebiuld a turbo by stealth mode rebiuld pretty good instruction and good pictures

[dbsharp]

mark the relative locations of all parts that rotate with the main shaft. Balance is very important. Keep every internal part of the turbo clean and make sure to lube it up. I use electric parts cleaner and gloves when I handle stuff I want to keep real clean.

I just rebuilt my turbo today. Its pretty easy.

[h22sparkle]

researched and this is what I found

The easiest way to diagnose a weak turbo is to observe the vacuum/boost gauge or boost indicator light. If it doesn't show normal boost at full throttle (typically 9 to 14 PSI for many OEM turbo systems), better get the tool box. Be warned, however, that excessive backpressure (often due to a clogged catalytic converter) can also prevent the turbo from developing its normal boost pressure

If the turbo fails to deliver any boost, or the boost pressure is more than a couple of pounds below what it should be, note the vacuum reading at idle. A late model engine with no vacuum leaks or unusual exhaust restriction should show about 16 to 22 inches of vacuum at idle. A lower vacuum reading means you either have excessive backpressure in the exhaust system, an air leak somewhere in the intake system below the throttle (check the turbocharger hoses for leaks or loose connections), or a vacuum leak in one of the many hoses or accessories that tap off the manifold.

TURBOCHARGER INSPECTION

Assuming the engine shows normal vacuum readings but the turbo shows low or no boost, the next step is to find out what is wrong with the turbo. One of the most common causes of poor turbo performance is bad shaft bearings which often results in rubbing or binding between the compressor and turbine wheels and their housings.

Turbos spin at speeds that are often in excess of 100,000 rpm. If there is excessive play in the shaft bearings, the shaft will wobble allowing the wheels to scrape against their housings. The added friction prevents the turbo from spooling up normally, reducing the turbo's speed and effective boost delivery.

The best way to check for bearing problems or contact between the housing and turbo wheels is to remove the intake or exhaust plumbing from the turbo (which ever is easier) for a peek inside. Any sign of scraping on either the turbo blades or the housing means the bearings are shot and the turbo needs to be replaced or rebuilt. You should also spin the turbo by hand to feel for any roughness or binding. If it doesn't turn freely, repairs are in order


especially when you turn the turbo that it doesnt scrape make noises bearings shot,binding or worse bent up chipped or broken blades serious interruption of airflow. This will mess up the turbo altogether and possibly the engine that will suck that in straight inside and tear shit up.