Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #106  
Old 06-09-2017, 09:41 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Posts: 6,025
It may just need to be ridden hard and put away wet. My SDL ran like poo when I first started driving it. It's progressed to the point now that it fires up with the flick of a key, makes good power, and runs well cold or hot. Take it out and ride it HARD. It's about the only way to burn the carbon and soot out of the prechambers.

Reply With Quote
  #107  
Old 06-10-2017, 10:19 AM
Registered User
 
Join Date: Nov 2007
Location: Carlsbad, CA
Posts: 520
Risne - Repeat

Quote:
Originally Posted by Diseasel300 View Post
It may just need to be ridden hard and put away wet. My SDL ran like poo when I first started driving it. It's progressed to the point now that it fires up with the flick of a key, makes good power, and runs well cold or hot. Take it out and ride it HARD. It's about the only way to burn the carbon and soot out of the prechambers.


Then "Rinse & Repeat"
__________________

1986 300SDL 440,xxx
Reply With Quote
  #108  
Old 07-26-2017, 02:26 PM
Father Of Giants's Avatar
Registered User
 
Join Date: Feb 2017
Location: Newport News, Virginia
Posts: 1,597
Quote:
Originally Posted by 86-300sdl View Post
Then "Rinse & Repeat"
Couple weeks ago I took a 300 mile round trip out to Rapidan va, then back to the east coast. I tried my darnest to keep the RPMs at 3000+ the entire trip.

Results after replacing all these parts and going on a road trip???: No more injector knock. In fact, today I routed my fuel lines directly into a bottle of diesel purge, while the engine was at operating temperature....and guess what? It didn't change the sound of the engine at all. So now I'm in the clear.

Engine still shakes at idle when cold, and sometimes you'll hear the engine mis because of the incomplete combustion going on. Sometimes when I get off the highway on a HOT engine at operating temperature it will still occasionally 'misfire'. I know diesels don't technically misfrie, but it sounds like the diesels kinda skips and misses it's idle rythm. Kinda like a very brisk 'hiccup' or something.


Can I just pull the injectors off and check the prechmabers via visual inspection when I initiate the glow plug cycle to see if they are good? I already installed some new heatshields that the Great Greazzer sent me a couple months ago, so I don't think I have to necessarily get new ones if they are pretty new right?
__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.
Reply With Quote
  #109  
Old 07-26-2017, 03:00 PM
Diesel Preferred
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,788
No need to initiate a glow cycle to check the pre-chambers, just shine a nice bright light inside.

New heat shields EVERY TIME! They deform when you torque the injector to spec. You can bend them back into original shape and re-use, but that would be a temporary solution in my book. They are cheap enough and don't take up much space, just order a couple sets so you have at least one spare set on hand all the time.
__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
Reply With Quote
  #110  
Old 10-20-2017, 05:42 PM
Father Of Giants's Avatar
Registered User
 
Join Date: Feb 2017
Location: Newport News, Virginia
Posts: 1,597
Alright, so I finally got crush washers, I'm going to find out if it's a bad injector or dead cylinder Saturday morning.

Going to swap injector #6 and see what happens.
__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.
Reply With Quote
  #111  
Old 10-21-2017, 09:57 AM
Father Of Giants's Avatar
Registered User
 
Join Date: Feb 2017
Location: Newport News, Virginia
Posts: 1,597
Swapped and no change. Cylinder 6 and 2 are still missing.
__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.
Reply With Quote
  #112  
Old 10-21-2017, 11:56 AM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Posts: 6,025
Quote:
Originally Posted by Father Of Giants View Post
Swapped and no change. Cylinder 6 and 2 are still missing.
Are they actually missing out or is it just a rough idle? There's a difference. If you have 2 cylinders that aren't firing, that car is going to run like an absolute dog. It may not even idle. If it does, the engine is going to be rocking and rolling around in the engine compartment. You certainly wouldn't be able to drive it, 4 holes out of 6 firing will make less power than a 240D due to the uneven firing and drag/compression of the other 2 cylinders.

Stop guessing and find out what's going on. Do a relative compression test and report back the values for cylinders 1-6. If your compression values are normal-ish, it's an injection problem. If you have injection or timing issues, you can have a "soft" miss which is a cylinder that fires, but out of time or weaker than the others.
Reply With Quote
  #113  
Old 10-21-2017, 01:19 PM
jake12tech's Avatar
Registered User
 
Join Date: Nov 2011
Location: Philadelphia, PA
Posts: 2,878
I'd love to see a video of this quote on quote misfire. I feel I can help you and everyone else can with a video. There's a difference between a miss and rough idle like Diseaseal said. I can send you a video of a misfire, it was my 98 E300 with a bad injector pouring white smoke and the engine rocking violently all over the bay like it didn't have motor mounts. That's the difference.
__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k
Reply With Quote
  #114  
Old 10-21-2017, 04:15 PM
renaissanceman's Avatar
Registered User
 
Join Date: Nov 2014
Location: Idaho
Posts: 825
To me a miss is what happens when you start the engine without using the glows or with several dead glow plugs -- lots of sputtering, shaking the whole car and huge puffs of unburned diesel (white smoke).
__________________
RenaissanceMan Labs: where the future is being made today.

Garage:

2017 Chevy Colorado Diesel (nanny state emissions)
2005 Volvo S40 T5 AWD, 77k
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg

WARNING: this post may contain dangerous free thinking.
Reply With Quote
  #115  
Old 10-21-2017, 06:08 PM
Father Of Giants's Avatar
Registered User
 
Join Date: Feb 2017
Location: Newport News, Virginia
Posts: 1,597
Quote:
Originally Posted by renaissanceman View Post
To me a miss is what happens when you start the engine without using the glows or with several dead glow plugs -- lots of sputtering, shaking the whole car and huge puffs of unburned diesel (white smoke).
My car still had incomplete combustion even when at operating temperature, only softer.

Quote:
Originally Posted by jake12tech View Post
I'd love to see a video of this quote on quote misfire. I feel I can help you and everyone else can with a video. There's a difference between a miss and rough idle like Diseaseal said. I can send you a video of a misfire, it was my 98 E300 with a bad injector pouring white smoke and the engine rocking violently all over the bay like it didn't have motor mounts. That's the difference.
I'll post a video of the whole event tommorw morning. The engine shakes and smokes like mad, but when cylinders 6 and 2 are cut off smokes a lot less and is smoother.
__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.
Reply With Quote
  #116  
Old 10-21-2017, 06:15 PM
Father Of Giants's Avatar
Registered User
 
Join Date: Feb 2017
Location: Newport News, Virginia
Posts: 1,597
Quote:
Originally Posted by Diseasel300 View Post
Are they actually missing out or is it just a rough idle? There's a difference. If you have 2 cylinders that aren't firing, that car is going to run like an absolute dog. It may not even idle. If it does, the engine is going to be rocking and rolling around in the engine compartment. You certainly wouldn't be able to drive it, 4 holes out of 6 firing will make less power than a 240D due to the uneven firing and drag/compression of the other 2 cylinders.

Stop guessing and find out what's going on. Do a relative compression test and report back the values for cylinders 1-6. If your compression values are normal-ish, it's an injection problem. If you have injection or timing issues, you can have a "soft" miss which is a cylinder that fires, but out of time or weaker than the others.
I have a leakdown tester.

Don't I have to remove the valve cover to see if any other piston other than #1 is at TDC?

Also since the combustion chamber is or combustion space is much smaller on a Diesel, therefore compression is much higher, will that give the leakdown tester a false positive of a nearly leak free cylinder?
__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.
Reply With Quote
  #117  
Old 10-21-2017, 06:57 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Posts: 6,025
You need a compression gauge ($30 at Harbor Freight), not a leak-down tester. The leak-down tester is useful for finding out WHERE your compression loss is. If you do a relative compression test and all of your cylinders are low (say 325PSI), but relatively even, the leak-down tester will tell you where the compression loss is, but not why your operating state is so rough.

The compression tester will tell you which cylinders are low, if you have a pair that are low (indicating a blown head gasket between adjacent cylinders), or if the mechanical health of the engine is ok and you need to look at fuelling and timing instead.
Reply With Quote
  #118  
Old 10-21-2017, 06:59 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Posts: 6,025
Quote:
Originally Posted by Father Of Giants View Post
My car still had incomplete combustion even when at operating temperature, only softer.



I'll post a video of the whole event tommorw morning. The engine shakes and smokes like mad, but when cylinders 6 and 2 are cut off smokes a lot less and is smoother.
This sounds more like injection problems or timing issues. since you have a different result when killing 6 or 2, you know that they ARE firing. That is not a "miss" or "skip".
Reply With Quote
  #119  
Old 10-23-2017, 08:46 AM
Father Of Giants's Avatar
Registered User
 
Join Date: Feb 2017
Location: Newport News, Virginia
Posts: 1,597
The car ONLY has reduced smoke when cold if lines 2 AND 6 are cracked open.
Even at operating temperature the car still has a rough idle.
Glow plug relay is reading all the glow plugs to be at 0.5ohms .
Glow plug voltage is at battery level too.
As shown in the video, car starts easy with no problem.
I have installed new hydraulic lifters
Injectors rebuilt by Greazzer
Had a diesel purge a couple weeks ago as well.
Idle is set at the default mechanical setting, where idle rpm is at the lowest.
Cracking the lines seems to have almost no effect on the idle of the engine too.

With the new video what do you guys think it could be?
I'm in the works on doing a compression test, a leak-down test, and inspecting (and if needed...correcting) the injection pump timing, engine and cam timing.
I personally suspect it to be low compression, but I guess one or two extra guesses or even more is better than one here.

__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.

Last edited by Father Of Giants; 10-23-2017 at 09:04 AM.
Reply With Quote
  #120  
Old 10-23-2017, 02:52 PM
Diesel Preferred
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,788
Good video, that helps! I agree with the others, you've got a weak couple of cylinders, but not total misfire / no fire.

Quote:
Originally Posted by Father Of Giants View Post
Swapped and no change. Cylinder 6 and 2 are still missing.
Which injectors did you swap? If you swapped #2 with #6, and vice versa, that wasn't much help. If you swapped, lets say, #1 with #2 and #5 with #6, and no change, then you have proven that the injectors are not the problem.

I've got to go back and read up on what else you've done so far, any other symptoms you mentioned.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 06:24 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page