what the heck is this sound? (300 Turbo Diesel video)
 

so, this car (other than the sound, runs great)and has tons of power... doesn't consume much oil, does not have excessive blowby.... what is this sound?

http://www.youtube.com/watch?v=KstzHKEDwSc

nothin'

Bad injector and the idle is too high.

swapped injectors with known good ones, didn't go away.

i recently adjusted my valves and a very similar sound went away

and whats up with that idle?

the idle is set at 750 as far as I can tell. And I just did a valve adjustment (hoping the sound would go away)

sounds normal to me.

you do know its a diesel, correct?

are they supposed to be that loud??? I hear other MB diesels drive by all the time, and they purr like a kitten, this one has a nasty knock sound to it...

yes, I know its a diesel, I have swapped the injectors, adjusted the valves, changed the oil, fuel filters (valves had been neglected) check the chain, basically did some maintenance... I can't get this sound to go away..

thats because it won't go away. Its a old 617. Look for other video's on youtube.

I had given up hope that the nosie would go away, just curious what it was... no big deal, the engine has oil pressure so "run it" and call it a day I guess. :)

allmost sounds like a rod...

I thought it was a rod at first as well, but I have been driving it for three weeks, and no ill effects... So I don't think its a rod...Unless a rod could be bent for a long time, and not eat bearings. I'm not sure with these old MB diesels, I don't know that much about them. :)

its possible to have a very slightly bent rod and have it just "tap" the cylinder wall on each revolution. i would take the injector out of that hole and start the engine, if the noise is still there then you have a bent rod simple as that.

guess i'm gonna keep on drivin it, the car is very nice to drive, and no one wants to buy it... either way I have another good motor for it in my garage so if it goes bad, its no big deal. Thanks to all who chimed in, wouldn't mind hearin some other opinions though. :)

The last one I had that sounded like that, started making that noise and an hour later punched holes in both sides of the block :eek:

well, it hasn't punched holes in the block, and doesn't when I rev it hard when the oil is cold, I guess it could be an injector, just because I swapped them doesn't mean anything, but i'm still leaning towards a dead lifter, or an injector or something like that. (I guess a valve could be to tight even though I adjusted them)

Still cracks me up how folks rev these up quickly back and forth like they're a big block V8 or something......;)
Just doesn't befit a diesel for some reason.

It definitely sounds not good. Get a cheap mechanic stethoscope, narrow down the area in which the sound is coming from and report back.

Unfortunately
 

My Vote is:
Rod Bearing

That "Noise" is indelibly etched in my memory banks from a 617.951

It might run 100K or MORE...Or you might have a new "Fresh Air" entrance into
the lower block Tomorrow.

Sounds too high up for a rod.I think valve.But wtf do I know

I have 5 years and at least 40k miles on mine with a knock. Best I can figure without pulling the head is the knock is in the #1 piston pin.

Its easy to distinguish in this video.
http://www.youtube.com/watch?v=xMgVuGDf8xQ

Six of one, half dozen of the other.... it's all on borrowed time when suspect noises happens.

whether i'm on borrowed time or not, I guess it doesn't matter, this car needs to go to someone who will "enjoy" it, because i'm not going to enjoy it if I have to change the engine LOL... How possible is it to do an inframe on the engine? Can I just change all the bearings and call it good as long as it hasn't spun my crank or the piston rod i'm guessing... I notice this particular engine has two oil pans (upper, and lower) can you even get the upper off without pulling the engine?

Doing an inframe is nearly impossible. It is easier to remove the whole engine and do the internal work. The upper pan definitely easier to get off with the engine is out.

But before you start talking doom and gloom. You should narrow down where the noise is located. For it could be anything like a cracked flex plate, bad IP, and etc that may not require the motor to be taken out. Get a stethoscope and report back.

Alt bearings, vacuum pump, water pump, A/C compressor, clutch fan...check those as well. The mechanic's stethoscope is a good thing!

I will take your advice, thanks for looking on the bright side of things :) When I had all of the injectors out of the motor, I cranked it over and don't remember hearing the sound, but also the motor may not have been turning fast enough so I will use a stethescope and see.

My car made it thru 15hrs of 24hrs of Lemons with no air filter and that knock. 300k+ on the engine.

and then what happened?

I think it broke an axel.

The race is really only 15hrs, 7.5hrs over 2 days. I think from the start of day 1 to end of day 2 is 24hrs. Lost an axle with 30 min to go.

Wow. That sounds exactly like my car. Just like yours, it runs great, good mpg ( 25 ish city) doesn't burn oil, plenty o' power. I haven't pulled the injectors so maybe that's the culprit. Hell of it is, with my daughter starting college this fall, the car budget has been reduced to fuel and oil changes................forever I think :(

reduced to oil changed....hmm...weird...what is that? lol... thats how this car is for me now, just oil changes, and tire rotations.:eek: