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  #1  
Old 11-25-2012, 07:11 PM
Turbo Diesel 300SD Ky
 
Join Date: Dec 2006
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Awful engine rattle

Sounds like bolts in a dryer.
Limped car to mechanic.
He tried to brighten the mood, "the rest of the car is so cherry, if all you need is a new engine ..."
The Silver Bullet (1979 300SD with just 130k) is in the shop. I hope the verdict isn't catastrophic tomorrow.

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  #2  
Old 11-25-2012, 07:13 PM
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Failed harmonic balancer?
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1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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  #3  
Old 11-25-2012, 07:33 PM
Turbo Diesel 300SD Ky
 
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if failed Harmonic Balancer, how bad ?
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  #4  
Old 11-25-2012, 07:55 PM
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Not that bad. Could be a failed vacuum pump too I think. Not sure if a failing early double diaphragm style pump rattles or not.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #5  
Old 11-25-2012, 08:14 PM
Turbo Diesel 300SD Ky
 
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if a failing vacuum pump, wouldn't lock/unlock doors etc be affected?
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  #6  
Old 11-25-2012, 08:18 PM
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Answer

Quote:
Originally Posted by Cejpat View Post
if a failing vacuum pump, wouldn't lock/unlock doors etc be affected?
No, if the bearing fails = the spring loaded arm still drags around the face of the timing device pumping..



.
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  #7  
Old 11-26-2012, 12:42 AM
A work in process...
 
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In my experience, Mercedes get noisy rattliing sounds when they need maintenance. Usually not too expensive if you do the repair yourself. Oftentimes, it's the air intake system rattling around.
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  #8  
Old 11-26-2012, 08:23 AM
Turbo Diesel 300SD Ky
 
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this sounded like something loose under the valve cover
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  #9  
Old 11-26-2012, 08:29 AM
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any one adjust valve recently? I have had lifters fall of their perch when I was new at adjusting valves
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  #10  
Old 11-26-2012, 08:36 AM
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Cejpat- Is this an (independent) Mercedes mechanic? Has he done work to the car for you in the past and how long have you had the car?

Hate when they jump to the "new motor" solution so quickly.....even if only to make you feel better.......
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  #11  
Old 11-26-2012, 11:09 AM
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Is it there at all RPM and temps or does it go when reved or warm? If it goes away it could be injector nailing, and could just be a bad injector. It could be this even if it does it all the time though too, depending on how bad the injector is.
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  #12  
Old 11-26-2012, 12:09 PM
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Need to use a stethascope to pinpoint the sound in a case like this.

Do not assume the worst until you have the facts.

I had the same experience... twice. First time was the same sound you describe. Two mechanics who listed to it said I needed a motor. A third, already drunk as a skunk (it was a Friday afternoon) walked up, listened, and pointed to the alternator, then told the other two what they used for brains.

And the answer was: alternator bearing failure.

Second time, I self-diagnosed a bearing failure (it was a more subtle knock) and sold the car the next day for $350.

And the answer was: injection pump failure. Car is still on the road today, with a rebuilt pump installed.
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  #13  
Old 11-26-2012, 12:21 PM
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Hmm

Quote:
Originally Posted by Cejpat View Post
this sounded like something loose under the valve cover
My first suspicions:

#1. Valve adjustment bad or failed adjustment locking nut.

Valve adjustment OM615, 616, 617 FYI.

#2. Injector nailing.

Strong nailing

Injector + Heat shield + Nozzle, Prechamber + Collar, and Nailing. LINK THREAD

Diesel Injection:


.
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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1980 240D
1983 300D
1984 190D
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  #14  
Old 11-26-2012, 12:22 PM
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X2 on listening to where the sound comes from.

When the Air Filter Bracket/Air Filter Housing is loose or broken it sounds like something is going to come off of the Engine.

I had a rattling sound in the front of the Valve Cover and it turned out the small upper Timing Chain Guide (#89 in the pic) was loose. Tightend the Bolt up and no more issues for over 4 years.
Attached Thumbnails
Awful engine rattle-engine-shows-timing-chain-upper-closeup.jpg  
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  #15  
Old 11-26-2012, 12:43 PM
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Quote:
Originally Posted by Cejpat View Post
Sounds like bolts in a dryer.
Limped car to mechanic.
He tried to brighten the mood, "the rest of the car is so cherry, if all you need is a new engine ..."
The Silver Bullet (1979 300SD with just 130k) is in the shop. I hope the verdict isn't catastrophic tomorrow.
If they suggest something really expensive I would get a second opinion. That is unless it is sane and obvious and reasonable to repair.

I hope you know this shops general reputation. Certainly an engine at 135k miles can have serious issues but not that common if the milage is indeed accurate. You do fuel the car yourself? If not someone loading gas into it might not be very good. I am unaware if it would make the sounds you describe though with bad or unsuitable fuel..

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