Depressed beyond belief - Page 4 - PeachParts Mercedes-Benz Forum

JimmyL · #46 05-06-2005, 11:23 PM

Just a quick question, as my head swims with all the info I'm trying to absorb. Why doesn't the wagon smoke when running diesel purge? Is the Lubromoly so super-combustible that it masks and/or compensates for whatever is happening? Because running straight purge smooths out the idle and takes the smoke completely away.

whunter · #47 05-07-2005, 02:21 AM

Andy = 1985 300SD Sady went through four used injection pumps before he got a good one.
Read his thread "wont start for anything!", and how it came out 25,453 views.
wont start for anything! 1985 300SD

Do not surrender yet.

Johnhef · #48 05-07-2005, 08:10 AM

apologies for my dumb question if this was already covered and I forgot, but this hasn't been the only tank of fuel you've had the problem with, right? Do you use the same diesel station each time you fill up?

tomm9298 · #49 05-07-2005, 08:49 AM

There in lies your clue. My 300D when running any injector cleaner or straight WVO, purrs like a kitten. When I run diesel it nails. My problem, crappy India rebuilds on my injectors. The engine is fine, it's the injectors that are at fault. Does your wagon come up to operating temp? I had a severe smoke (white smoke) problem when idling cold in the winter. Then I replaced the thermostat. I mean it would billow massive clouds of white smoke. Again, it is my injectors, but the problem was made worse by the never warming up engine. When the engine came up to temp, then it was just a small amount of white smoke, I beleive that the un burned fuel, due to faulty injectors, was not burning until everything warmed up. This is just my theory, and I very well could be wrong, many here know MUCH more than I about these engines. Not to say this is your issue, but it was mine. Good luck, keep us posted.......

franklyspeaking · #50 05-07-2005, 11:18 AM

JimmyL,

I apologize for my earlier posts in which I suspected timing issues. I just didn't thoroughly read all of the old posts....it really does help some of us who get behind on the Forum to catch up, if all common problems are kept in one thread - like Sady's.

It does seem like you have worked hard to insure timing is correct. You could still have an issue with the damper having rotated or the IP sprocket splines being worn, but this seems less than probable. Having a reputable mechanic checking these issues out also leads me away from timing as the cause. Turning the engine backwards is never good, because in order to get the cam to move 1mm, you would have to take up the slack first, since the tensioner doesn't work without oil pressure, and you are pushing the chain back through the IP sprocket. But all of this has been thoroughly checked out by you and your mechanic, and all appears to be correct. I had to turn my engine backwards once about 30 degrees, due to a tensioner failure, and it did not jump time. There just isn't much clearance for the chain to run in and it is difficult for it to jump out of the sprockets.

This problem does looks like a fuel timing issue, and it still may be, but I am also wondering if there may be something in the prechambers that is causing the problem? It is about the last thing that you have not checked....and of course in problem solving, it is usually the last thing you check that is the problem. One thing for sure, there is a problem, and it can be fixed. Just keep telling yourself this truth, until you find it. It appears your problem appeared suddenly, as in a failed component and was not a gradual wear (like compression, carbon buildup, or timing drift). I have never had any experience with prechambers, and I know you have to have special tools to remove them, but if you can acquire the tools and knowledge, it will cost you nothing to check them but time.

Also, I wanted to commend you on your thoroughness, so far....and encourage you to continue until you find the problem.

Good luck!

michael cole · #51 05-07-2005, 01:21 PM

just for the heck of it try an oil conditioning product.if you do have some sticking piston rings low compression could be a result=white smoke at low rpm.Rislone is one product that comes to mind.you have to give a little time or mileage to work though.best of luck

JimmyL · #52 05-08-2005, 12:51 AM

Quote:

Originally Posted by Johnhef

apologies for my dumb question if this was already covered and I forgot, but this hasn't been the only tank of fuel you've had the problem with, right? Do you use the same diesel station each time you fill up?

Hey John,
Yes, many tanks have been run from different stations. I also drained the tank, which was very clean, and checked the screen, which looked new.
It is shocking how well it runs and idles on purge, and how the smoke completely goes away.

And "Franklyspeaking", I have not done anything with the prechambers. That is getting into the area where help will be required.

JimmyL · #53 05-08-2005, 01:03 AM

Quote:

Originally Posted by tomm9298

There in lies your clue. My 300D when running any injector cleaner or straight WVO, purrs like a kitten. When I run diesel it nails. My problem, crappy India rebuilds on my injectors. The engine is fine, it's the injectors that are at fault. Does your wagon come up to operating temp? I had a severe smoke (white smoke) problem when idling cold in the winter. Then I replaced the thermostat. I mean it would billow massive clouds of white smoke. Again, it is my injectors, but the problem was made worse by the never warming up engine. When the engine came up to temp, then it was just a small amount of white smoke, I believe that the un burned fuel, due to faulty injectors, was not burning until everything warmed up. This is just my theory, and I very well could be wrong, many here know MUCH more than I about these engines. Not to say this is your issue, but it was mine. Good luck, keep us posted.......

The mechanic who was working on the car test drove it after installing the 2nd IP. He did notice that the gauge did not get that warm, as in well below 175. He removed the thermostat, which was upside down by the way, and installed a new one. My wagon also does not have a fan clutch, just a direct drive fan, which seems quite robust.
I have 5 injectors from my parts car that supposedly have less than one full tank run through them. They are 115 bar instead of 135, but they should let me know if crummy injectors are my problem even though they were rebuilt during this whole process.
I finally got the wagon home today as it has been sitting across town at my office since Thursday. My wife will have nothing to do with this car (if that tells you how things are going around here) so my son helped me go pick it up. I didn't have time today to swap injectors, and prolly won't have time tomorrow with Mother's day activities and all. Maybe Monday after work, we'll see.
If it isn't just bad rebuilt injectors, which I doubt, then I will simply, politely, yet quite shamelessly have to throw myself and wagon on the mercy of my forum buddies that live close enough to drive to. When they have time, that is. Until then it will remain parked, and be a haven for wasp nests, like my parts car is turning into.....

By the way Michael, I did try some Marvel's Mystery oil in the oil, and also in the fuel, as recommended by my mechanic prior to his time with the car, to see if it might be a stuck ring or some-such. that didn't help, and when compression was tested, 4 were identical and one was just 20 lower.

Oh yeah, on the way home it was hard to believe, but my wagon is now slower than it was. I didn't think that possible. The new IP seemed to be adjusted correctly from a linkage standpoint, and it was drip-timed, but I'll be darned if it wasn't much slower. Highway on ramp was slightly uphill, and I couldn't get car over 50 for well over a half mile. No embellishment, by the way, that is literal.

JimmyL · #54 05-10-2005, 01:28 AM

Replaced injectors with the newly rebuilt ones from my parts car, and have the same smoke!

Wagon is parked, and I am done without help. I had given up before, which is why I took it to the mechanic. When he gave up I knew I was in trouble.
I am contemplating ending the diesel experiment and refocusing on my '79 Chevy PU that I got with 3 miles on it. It has never let me down in 26 years...
I will give it some time so I don't make an impulse sell, but this is no fun anymore.
I wasn't "crying" before, but I guess I could be accused now.....

tomm9298 · #55 05-10-2005, 06:53 AM

I still feel it might be a fuel delivery problem. White smoke SHOULD be un burned fuel. I am not to sure if coolant was in the combustion process what color it would be. I do know that it is supposed to smell "sweet". I wish I had something better to tell you. However, in the area that you live, I know Texas is HUGE, there are some very fine wrench turners. Maybe a cookout with a few steaks and some beer might attract a few to you and your problem wagon.

dkveuro · #56 05-10-2005, 10:08 AM

Quote:

Originally Posted by tomm9298

I still feel it might be a fuel delivery problem. White smoke SHOULD be un burned fuel. I am not to sure if coolant was in the combustion process what color it would be. I do know that it is supposed to smell "sweet". I wish I had something better to tell you. However, in the area that you live, I know Texas is HUGE, there are some very fine wrench turners. Maybe a cookout with a few steaks and some beer might attract a few to you and your problem wagon.

I'm closer

....and....first dibs if it goes for sale......

JimmyL · #57 05-10-2005, 03:10 PM

Quote:

Originally Posted by dkveuro

I'm closer

....and....first dibs if it goes for sale......

All offers accepted. Really!

halman2228 · #58 01-24-2011, 11:39 PM

My 1st foray into dieselnomics...

I am attemptiing to diagnosis my brother's Mahindra tractor that makes a Califronia wildifire look tame (smoke-wise).

About 130 hours on a 5 year old engine...

Regards to all,
Kevin

JimmyL · #59 01-24-2011, 11:49 PM

Yes, I solved this back in '05.
Sold it........

biopete · #60 01-25-2011, 12:27 AM

Damn this is the worst climax ever. What was wrong ? Who'd you sell it to and where do they live. I want to know what was wrong with that car

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