602 exhaust full of oil - PeachParts Mercedes-Benz Forum

dieselbenz1 · #1 02-17-2021, 08:40 PM

I see to have a seal that has failled in the turbo. This would be the Garrett T25. How does one tell which turbo rebuild kit should be purchased. Some ask if it is a dynamic seal or a carbon seal. Some kits are $30 some are $140. I just am looking into this any help is welcome.

Diesel911 · #2 02-17-2021, 10:23 PM

Quote:

Originally Posted by dieselbenz1

I see to have a seal that has failled in the turbo. This would be the Garrett T25. How does one tell which turbo rebuild kit should be purchased. Some ask if it is a dynamic seal or a carbon seal. Some kits are $30 some are $140. I just am looking into this any help is welcome.

There is some threads on rebuilding them but I don't recall specific means of identifying what type of seal is on the compressor side.

Most of the threads I have read either what seal was needed was discovered by taking the Turbo apart of the person selling the seals was able to tell them (there is a number plate on the compressor side that has the part numbers and other numbers).

However, those mentioned seals are on the Compressor side not the exhaust side. It has piston ring (dynamic) type seals and you need to be sure the groove in the turbine wheel is not worn out too much to accept a new rings.

Also the bearing housing bore that the piston ring seals on on the exhaust side you should see a smooth bore and then a step. In the smooth bore area before the step there should be no groove

Also the thrust area on the Plate can be worn out or the seal bore worn out necessitating a new plate.

The good news is it is a Garrett turbo (used to be called Air Research) and while they are world wide the starter off here in the US.

The attached picture is of 3 types of compressor end seals.
In the other pic the part labeled Tag is the number plate.

filp · #3 02-17-2021, 10:29 PM

Send it off for rebuild or spare yourself the headaches and buy the whole CHRA refurbished

dieselbenz1 · #4 02-18-2021, 07:39 AM

So the tag indicating which type of bearings requires a tear down? That puts a damper on things to have to wait for parts I mean you can't pre-order.

I like the idea of buying g the CHRA but am having troubles finding one.

Diesel911 · #5 02-18-2021, 11:10 AM

Quote:

Originally Posted by dieselbenz1

So the tag indicating which type of bearings requires a tear down? That puts a damper on things to have to wait for parts I mean you can't pre-order.

I like the idea of buying g the CHRA but am having troubles finding one.

The tag is like your vin number on your car. Some one who handles Garrett turbochargers like of course someone that specializes in turbo rebuilding or say a Speed Shop (in the old days hotrodders) may be able to look it up.

A place that rebuilds garret tubos should be able to look on the number plate and provide you with what used to be a cartridge assembly. What that is; is the bearing housing housing with the turbine and compressor all assembled and you insert that into your Exhaust and compressor housing.

On my year and model I believe in the EPC there is Mercedes Part numbers for the parts. Once you have the Mercedes part number you can shop with that.

Just my opinion but you seem too hesitant to plunge into the job. There is more to it then just replacing seals and bearings.

Even before I went to trade school and did not know much at all about mechanics I was eager to learn how to do stuff and was willing to take the risk of botching a job just to learn.
And yes I have been pressed to get the only vehicle I had running. When My Oil Cooler Hoses needed replacing I had to get my car going to take me to work before the hose was going to arrive. I went to NAPA and got the thickest 3 layer heater hose they had and used that for 3 days and I only drove to work which was 3 miles away and back.
Fortunately I got away with that.

Sometimes you just have to do what you have to do to get the car on the road. In you case that seems like the best course is to get something that is rebuilt. Either the whole Turbo or the rebuilt cartridge assembly.

The T25 in various forums is used on a lot of vehicles and equipment in the US so it is not a strictly Mercedes thing..

dieselbenz1 · #6 02-18-2021, 11:55 AM

Once I saw the oil in the exhaust I knew it was turbo rebuild time and I also had seen previous posts of people rebuilding these. Some successful some not so. I had a turbo rebuilt 10 or so years ago for $650 cdn soI thought maybe I could tackle it. Only when I found lots of different kits offered did I get concerned. Yes I know lots more than just replacing seals is why I am tending for a replacement cartridge and I'm just pricing them out but looking to be closer to $200 cdn for new. Kinda takes all the risks away for an ok price since its a real pain to remove from a w124.

Diesel911 · #7 02-18-2021, 09:10 PM

Quote:

Originally Posted by dieselbenz1

Once I saw the oil in the exhaust I knew it was turbo rebuild time and I also had seen previous posts of people rebuilding these. Some successful some not so. I had a turbo rebuilt 10 or so years ago for $650 cdn soI thought maybe I could tackle it. Only when I found lots of different kits offered did I get concerned. Yes I know lots more than just replacing seals is why I am tending for a replacement cartridge and I'm just pricing them out but looking to be closer to $200 cdn for new. Kinda takes all the risks away for an ok price since its a real pain to remove from a w124.

That seems like a reasonable price.

I for got to mention that Oil can also come out down the Valve Stems and you won't see that till you pull of the Turbo and see evidence of Oil in the exhaust manifold.

Other 2 possibles. Head Gasket leaking Oil into a Cylinder or a dead cylinder which has the piston gradually pumping oil up from below because there is not combustion pressure to push the rings against the cylinders and scrape the oil off of of the cylinders. However, you would think you would have a performance issue if that was happening.

filp · #8 02-19-2021, 01:09 PM

Quote:

Originally Posted by Diesel911

That seems like a reasonable price.

I for got to mention that Oil can also come out down the Valve Stems and you won't see that till you pull of the Turbo and see evidence of Oil in the exhaust manifold.

Other 2 possibles. Head Gasket leaking Oil into a Cylinder or a dead cylinder which has the piston gradually pumping oil up from below because there is not combustion pressure to push the rings against the cylinders and scrape the oil off of of the cylinders. However, you would think you would have a performance issue if that was happening.

You should show us what and where you purchased

I got a chinese CHRA from ebay for $170, holds up well (installed June 2019), not sure about the seals - car is smoking a tiny bit, with new injectors; head gasket is fine but it did blew some oil when I had the oil catch can installed. Experts say it's normal so I don't really care. Probably valve stem seals - they told me bandaid fixes are not worth it unless I do complete rebuild. I agreed.

dieselbenz1 · #9 02-19-2021, 07:24 PM

I had contacted G-pop and another company both say the T25 is a rare beast but to provide them with the turbo number. I should have it out over the weekend. Yeah I saw a few on ebay that are Chinese and thats where the $200 came from.

bkc · #10 02-19-2021, 09:50 PM

GPopShop has rebuilt three of my om602 turbos in the past few years without any indication of problem finding parts (two in 2016, one in 2019). BTW, yours should actually be a TB2535 turbo, since I expect it is the same as my three.

Diesel911 · #11 02-19-2021, 10:06 PM

I just came a cross this site: https://www.garrettmotion.com/turbo-replacement/aftermarket-turbochargers-turbo-identification/

filp · #12 02-20-2021, 05:28 PM

..

dieselbenz1 · #13 02-20-2021, 07:58 PM

Ok found the Garrett tag see picture. Next week I'll solicit some prices. Its confirmed the turbo seal has failed. The shaft does not have any play so I'll also research how go rebuild just in case but I hate the thoughts of waiting a few weeks for parts which seems to be the norm lately.

filp · #14 02-20-2021, 08:37 PM

Lucky guy
https://www.turbosoutlet.com/chra-tb2535

Parts no for your turbo: https://www.turbomaster.info/eng/garrett_parts_list/465445-0001.php

A friend of mine should have the used complete assembly, he can sell it, in case you need a backup.

bkc · #15 02-20-2021, 08:48 PM

465445-2 is the Garret number. Definitely a TB2535, same model number as two of mine (the other was just a difference of -1 instead of -2).