1985 benz 300D dead cylinder&turbo - PeachParts Mercedes-Benz Forum

My85-300D · #1 01-18-2011, 09:00 PM

Hi there guy's.... I'm new here on this forum... Nice place you guy's got here!!!!! Well, letme start with my story

..... On january 15, I purchase a 300 turbo diesel "not runnin" The guy said the turbo ws bad and also said only 4 cylinder was working........ Now I check the turbo myself and it's stuck and don't move at all, also maybe one of the injectors fail and 4 cylinders are working... The motor shake of coarse bcz of this... Also I did a blow by test and that thing can blow like a train Lol.... But maybe all this issues are cause by the Jam turbo?????? HELP. What you guys recomendme to do? Get a new motor? or try to fixs this? I found a motor for $800

t walgamuth · #2 01-18-2011, 09:51 PM

Where to start.....

1. Test for injector problems by loostening one fuel line at a time. In this way you can isolate which cylinders are not firing. ONce you find which ones are not firing you can move the injectors from a good cylinder and see if that will cause the other cylinders to fire.
2. Or you can run a compression test.
3. A diesel is simple, it needs fuel and compression to run.
4. So it is one or the other.
5. If it is lack of compression it could be a ring problem, a burnt valve or simply valves needing adjustment. It could also be a broken rocker arm or a worn cam lobe.
6. The turbos rarely give trouble so first I would suspect really gummy dirty oil. If that is not the case it coulld be a siezed bushing.

So before going to the trouble to install a new motor I would do these dignostic tests and try to see what is causing the trouble.

Remember just buying a used motor is no guarantee it will be a good one. Checking out the used motor is best done with it in the donor car, preferably a drivable one.

My85-300D · #3 01-18-2011, 10:06 PM

Ok, Thanks for your quick reply

!!!! Now about the new engine is on a running car, they tell me to come and drive it, Now thats a good opportunity right!!!!! But Like you said, the first thing to do is cheking for the thead cylinder and swap the injector to see if it comes to live !!!! Now the turbo it's really dead, I try to spind the propel with me hands and it wont move, then I try with a screw driver and it turn but its really stuck... So one more Question

: How much to rebuild a motor like that, just the head work a new gasket and rebuild the injectors? Now the turbo im getting a ""biger turbo and adding an intercooler""

My85-300D · #4 01-18-2011, 10:08 PM

Another questio. Whats the firing order on this engine?

vstech · #5 01-18-2011, 10:49 PM

Hey! Welcome to the forum!
let's get the motor running well before we start amping up the power with bigger turbo's and intercoolers and such.
we have a good performance section at the top of this page.
the userCP button up top will allow you to create a gallery of photo's of your prize! be sure and post some here on your first page!

jkubica · #6 01-18-2011, 11:15 PM

Quote:

Originally Posted by My85-300D

Hi there guy's.... I'm new here on this forum... Nice place you guy's got here!!!!! Well, letme start with my story

..... On january 15, I purchase a 300 turbo diesel "not runnin" The guy said the turbo ws bad and also said only 4 cylinder was working........ Now I check the turbo myself and it's stuck and don't move at all, also maybe one of the injectors fail and 4 cylinders are working... The motor shake of coarse bcz of this... Also I did a blow by test and that thing can blow like a train Lol.... But maybe all this issues are cause by the Jam turbo?????? HELP. What you guys recomendme to do? Get a new motor? or try to fixs this? I found a motor for $800

Hi
Turbos aren't very pricey at Self-service junk yards.

In your situation, the first thing I would do is a compression check. Harbor Freight sells Diesel Compression Test kits for about $25. I would also pull the valve cover and check the valve adjustment and action. You can do both of these tests without the turbo working. Then you will have an idea
how good the current motor is. Also observe the oil pressure while the engine is at operating temp. It should be 3 bar at 1000RPM and over 1 bar at idle

If you do end up going with another motor - check the compression on it too - and observe oil pressure

Good Luck,
Joseph

My85-300D · #7 01-18-2011, 11:34 PM

Ok !!! Im going to get a compressio gauge at harbor freight, also going to chek the oil pressure and chek tha valves, just like you guys said!!!!!! Now: remember the turbo is lock right, ok do you think thats making the motor blowing smoke tru the oil refil cap?

My85-300D · #8 01-18-2011, 11:51 PM

I will be posting pic's soon !!!! So stay tunned !!!!!! =)

vstech · #9 01-19-2011, 09:09 AM

a locked turbo should not be causing any smoke or blowby. it's possible gravel or other debris got into the turbo, and damaged it, and a piston downstream... look the impeller over for damage. if it does not turn, it won't hurt to remove it, and look over both impellers. take some pics!

oh. and this is or is not a wagon?
td means wagon on the mercedes forum.

jkubica · #10 01-19-2011, 09:19 AM

Quote:

Originally Posted by My85-300D

Ok !!! Im going to get a compressio gauge at harbor freight, also going to chek the oil pressure and chek tha valves, just like you guys said!!!!!! Now: remember the turbo is lock right, ok do you think thats making the motor blowing smoke tru the oil refil cap?

Hi
After you get it firing on all 5 - or determine why it won't - like bad compression one one cylinder - you can do the tea kettle test.

This involves letting the oil fill cap sit loose on the hole at idle. Its OK for the cap to dance around a little - but it shouldn't blow off. All of these engines have some blowby - its a question of how much is too much.

Of course the engine will run better with the turbo working - but you can still tell a lot with it not working.
Joseph

My85-300D · #11 01-19-2011, 12:19 PM

Ok Good morning to everyone in here !!!!! I was cheking the engine today in the morning, And i got the 5 cylinders working perfect for about 3 min's and i was happy, thinking I fix's it, I fix's it !!! But for an unespected reazon the rpm went up like crazy around 4000 or 5000 rpm Not Sure. But the thing is that I try to turn off the engine by the key and not resuslt, try the engine stop button and that one fail too, so I found a rag on the floor and disconect the turbo intake pipe and put the rag in there, and Finaly the engine turn off..... But that happen right after i put oil on the motor...... Trust me guys i'm Lost here... Lol

vstech · #12 01-19-2011, 01:04 PM

ouch.
be glad the turbo was NOT running! rag would have sucked itself right in there!
where did you put the oil? these motors will run on motor oil, so if you have oil being pumped into the motor, it will "RUN AWAY" glad you thought to stuff something in the intake! good job!
I am going to guess you have a bad turbo oil seal, and once you added motor oil to the motor, the oil pumped itself into the intake, and force fed fuel into the motor! you got lucky!
the motor could have exploded!
I'd disconnect the oil line to the turbo and plug it off before another attempt to start the car is made. I'd also have something better than a rag to stuff in the intake hole.
get a large wooden dowel that fits tight into the turbo intake first!

whunter · #13 01-19-2011, 01:10 PM

Quote:

Originally Posted by My85-300D

How much to rebuild an engine like that, just the head work a new gasket and rebuild the injectors?

OM617.952 Rebuild parts list
http://www.peachparts.com/shopforum/showthread.php?t=274085

.

whunter · #14 01-19-2011, 01:13 PM

Quote:

Originally Posted by My85-300D

Ok Good morning to everyone in here !!!!! I was cheking the engine today in the morning, And i got the 5 cylinders working perfect for about 3 min's and i was happy, thinking I fix's it, I fix's it !!! But for an unespected reazon the rpm went up like crazy around 4000 or 5000 rpm Not Sure. But the thing is that I try to turn off the engine by the key and not resuslt, try the engine stop button and that one fail too, so I found a rag on the floor and disconect the turbo intake pipe and put the rag in there, and Finaly the engine turn off..... But that happen right after i put oil on the motor...... Trust me guys i'm Lost here... Lol

It was running on engine crankcase oil.

Run away diesel, why does it happen?
http://www.peachparts.com/shopforum/showthread.php?t=101404