what the heck is this sound? (300 Turbo Diesel video) - Page 2 - PeachParts Mercedes-Benz Forum

Marshall559 · #16 09-29-2008, 11:24 PM

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)

JimmyL · #17 09-29-2008, 11:58 PM

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.

DeliveryValve · #18 09-30-2008, 12:12 AM

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

compress ignite · #19 09-30-2008, 12:21 AM

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.

ob1 canola · #20 09-30-2008, 12:33 AM

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

#21 09-30-2008, 12:35 AM

Quote:

Originally Posted by compress ignite

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

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

DeliveryValve · #22 09-30-2008, 02:20 AM

Quote:

Originally Posted by compress ignite

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

Quote:

Originally Posted by ForcedInduction

I have 5 years and at least 40k miles on mine with a knock.....

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

Marshall559 · #23 10-01-2008, 12:24 PM

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?

DeliveryValve · #24 10-01-2008, 12:44 PM

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.

rrgrassi · #25 10-01-2008, 12:58 PM

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

Marshall559 · #26 10-01-2008, 05:16 PM

Quote:

Originally Posted by DeliveryValve

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.

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.