|
|
|
#1
|
||||
|
||||
What is making that sound (some sort of engine knock)
What do you think might be causing this sound:
http://www.youtube.com/watch?v=s2pEM3fAepw I adjusted the valves, corrected chain stretch (installed a 4 degree key), played with the rack dampener bolt, and rebuilt injectors with new nozzles. (No, I didn't test or balance them) This knocking sound just does not go away. It is the same as it was when I first got the car. The idle is nice and smooth, and I was very impressed when I took it out on the interstate today. it felt powerful and not loud (and I could not hear the bloody knock at 60 mph). Normal sound? Should I keep obsessing about it?? |
#2
|
||||
|
||||
Narrow Down the location
by loosening each one of the injectors (Individually) with the engine running...
the one that stops the "Knock" may be your problem area. OR Mechanics Stethoscope to be able to locate the noise. http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=41966 (I don't like the sound of that!)
__________________
'84 300SD sold 124.128 |
#3
|
||||
|
||||
Yep, that's the stethoscope I have... the knock seems to be closer to the front (i.e. 1, 2 or 3). Going to try the removing injector line nut one by one thing and see if I can narrow it down.
What sound do you not like? |
#4
|
||||
|
||||
Nature of the beast, I replaced a motor that was knocking like that. Looking back I shouldn't have, I drove with a knock for many many miles. If I were you I'd enjoy your car and not worry. I know the noise is annoying (yeah it is I am a perfectionist) but I think you will be fine if you just let it do it's duty...
__________________
Regards, Ian White 1995 E300 Diesel w124 OM606 2014 E550 w212 M278 biturbo 2001 BMW 740i E38 M62 (past) 1981 300SD w126 OM617 (past) |
#5
|
||||
|
||||
What am I listening for? That engine sounds normal.
__________________
-Typos courtesy of my mobile phone. |
#6
|
||||
|
||||
Sounds exactly like my engine....
__________________
TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#7
|
|||
|
|||
my 82 300SD engine has 220k kms on it, barely broken in lol and it has abit a knock sound like that too, my chevy 6.5LTD has a knock like that too when its cold? i think its just diesel thing, tried running some purge through it yet?
__________________
93 b2200 EFI turbo, reg cab/short box, F2t swap build thread here 92 B2600i Cab plus getting a 82 3.0L 5cyl 617 mercedes Turbo Diesel build thread here 96 GMC 1500 z71 4x4 6.5L turbo diesel Diesel all the way!!! |
#8
|
|||
|
|||
My best guess is an injector. See if you can identify a specific loacation. Have you ever had the injectors checked/ replaced? How many miles on them?
|
#9
|
||||
|
||||
Quote:
You're one of us now, you have an antique car with a diesel engine YOU ALREADY ARE OBSESSED
__________________
1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine) Raleigh NC - Home of deep fried sushi! |
#10
|
||||
|
||||
Quote:
I found this video on youtube http://www.youtube.com/watch?v=tOhLBkBR1k0&feature=related Title is 'piston slap', this is the closest sound to mine that I was able to find... |
#11
|
||||
|
||||
Piston slap articles
|
#12
|
||||
|
||||
Sounds to me like typical "nailing."
http://www.youtube.com/watch?v=dseUEVVGsAw&feature=related I'd try some Diesel Purge!
__________________
1992 300D 2.5T 1980 Euro 300D (sadly, sold) 1998 Jetta TDI, 132K "Rudy" 1974 Triumph TR6 1999 Saab 9-5 wagon (wife's) |
#13
|
|||
|
|||
If you can narrow it down to a particular cylinder that way, then you could swap a couple of injectors to see if the behavior "goes with the injector".
|
#14
|
|||
|
|||
ENGINE KNOCK
I had an old 240D that knocked until i replaced the vacuum pump. Good luck!
|
#15
|
|||
|
|||
well i thought mine sounded like that but ill let you be the judge.
http://www.youtube.com/watch?v=V_jLKHKxOGc
__________________
93 b2200 EFI turbo, reg cab/short box, F2t swap build thread here 92 B2600i Cab plus getting a 82 3.0L 5cyl 617 mercedes Turbo Diesel build thread here 96 GMC 1500 z71 4x4 6.5L turbo diesel Diesel all the way!!! |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|