1987 300td wagon - Garrett Turbo question
 

I had my Garrett turbo rebuilt for my OM603 and I am putting it back in. I'm going to drain the oil and put fresh into the car.

Do I put fresh oil directly into the turbo?
Do I just stop the fuel pump crank the engine and let the engine pump fresh oil around?

This is my first time replacing a turbo just want to do it right.

I would install it and start the engine as I do after an oil change. I suppose you can pour oil into the turbo before fitting the supply line. Draw some oil through the dipstick tube with a MityVac then pour it into the turbo so you don't overfill. Or hold down the STOP lever while cranking to build oil pressure which should work its way to the turbo.

Sixto
87 300D

YES
 

ALWAYS prime the turbo with fresh oil, especially a rebuilt unit.

I am shocked the re-builder failed to STRESS this CRITICAL point..

.

I think he thought I knew what I was doing. Plus I was asking all kinds of questions - obviously not the right ones, but it may have sidetracked him.

FYI
 

I change the oil, make and install this special tool
http://www.peachparts.com/shopforum/diesel-discussion/348079-special-tool-running-your-diesel-engine-without-turbo-installed.html
build up system oil pressure by cranking without your choice:
* Glow plugs.
* Injectors.

Then lubricate and install the TURBO.


Have you read my horror story?
http://www.peachparts.com/shopforum/diesel-discussion/324783-1992-300d-2-5-vacuum-pump-failure-ball-bearings-fell-into-timing-chain.html

.

So I primed the turbo with a bit of oil before I reattached the oil lines and replaced the oil and filter. After we got everything back together we cut off the fuel and let the engine crank over a few times to pump oil around.

The car would run for a bit and die. It would immediately die if you tried to give it gas.
After removing the top intake that runs from the turbo to the manifold the car ran like a champ. We could see the air coming from the turbo. It looked good. When I put the I intake back on but did not bolt it in place the car still ran.

Now on my friends car when we cleaned the throttle body we had to disconnect the battery to reset the mass air flow sensor - does the om603 do the same thing?

Also the old turbo was covering the intake in oil I'm going to use degreaser to clean it up today and see if that helps.

The OM603 air intake sensor is not a MAF as we know it now (and like on the W210 and newer). It is a spring loaded gate that gets pushed aside as the air moves, this turns a potentiometer, which gives a relative air flow value. There is also a thermistor in there to take the incoming air temperature.

All of this just serves to tell the EDS whether to actuate the EGR and ARV valves or not. This will not cause the engine to die if something is malfunctioning in the air box.

I say something is choking off the air flow in the turbo. Since you took the x-pipe off and it runs that tells me you are starving for air above idle.

In addition to dumping some oil into the turbo manually I would have a helper hold the stop lever down while you crank until the oil pressure comes up.

-J

This might be semantics but how do you prime something like a turbo that doesn't have a lubrication pump? You can wet the bushing surfaces with oil and you can get oil into the supply line, but prime?

There might be air in the fuel system. Did you touch the injector lines or loosen the big filter? If it's running now, it should be fine if it was air in the fuel. Can you spin the turbo shaft with your fingers?

The 603 doesn't have a throttle body and the MAF sensor does nothing to prevent the engine from revving.

Don't worry too much about the inside of the crossover pipe. There's far more gunk in smaller passages in the intake manifold and head ports. Hardly makes sense to clean the rim of the funnel but not the tip. Wait until you have time to clean everything. Since the car was running reasonably well before the turbo rebuild, get it running again to make sure the turbo was rebuilt properly before addressing the next thing.

Sixto
87 300D

That makes a lot of sense. About how the MAF sensor works.

The port for the egr valve was pretty much blocked when I took everything apart and now that it is clean I think it maybe malfunctioning. I'm going to make a bypass plate later today and try that.

As for "priming" the turbo I put oil into the oil inlet and manually turned the impeller. Then I held the fuel closed and had some crank the engine to bring up the oil pressure.

I taped over the EGR port on the intake and the engine seemed to run fine. Now I just need to make a permanent cover and it should be good.

I bought this.
Mercedes Diesel 300D EGR Delete Kit | eBay

Perfect fit.

Will it fit a 603.96? Looks like it will.

Sixto
87 300D