Audio clip!

1974 240D Engine Noise while Cold

The car makes the same noises when warm. What does it sound like to you all? What's causing it?

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

Exhaust leak on one cylinder?

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John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k

Damn good idea to get a noise heard!!! I second the exhaust manafold gasket blown. If your car DOESN'T have A/C then it is easy to pull the exhaust manafold. My '77 240D has A/C with the York compressor and the whole A/C bracket had to come off.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.

i didnt hear anything?

I concur, it could be an exhaust leak. It also sounded like it could be valve noise. I don't think it is either nailing or rod knock.

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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

You didn't hear an exhaust leak or you can't hear the file?

If it was an exhaust leak, wouldn't the sound be consistently loud since the gas is escaping the entire time? It only makes that sound hard acceleration or on a hill.

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

no i didnt hear the file lol.
edit: i just heard the file it is definitly an exhaust leak.try this put your hand by the exhaust and floor the engine if you feel any air thats where your leak is.

I concur with the possibility of an exhaust leak.

The additional noise on hard acceleration is due to increased backpressure in the exhaust and nowhere for it to go but out the point where the gasket has failed.

Ditto, Sounds like an exhaust leak, as I've heard that sound many a time on some of our old farm trucks@

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1979 Mercedes 240D (Sold to a neighbor last year,now I have room for a new one,looking for a 300D this time)
1980 Mercedes 240D(bought for a parts car, but I have fun driving it!)

Thanks all, that does make sense. I didn't think to check the gasket since I haven't had the engine running with the hood open. I guess I will have to live with it and crank up the radio more!

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

I concur, it sounds like an exhaust leak… My two cents.

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1983 123.133 California
- GreaseCar Veg System

I originally thought it was bad fuel because it was going away when I was running B100. It has gotten progressively worse. But hey it covers up the bearing noise! which befuddles me becuase it's brand new!

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

Definitely sounds like an exhaust leak to me too. What 'bearing' noise is it covering up?? A head gasket should be relatively easy to fix on your 240d. BYW, is that the engine you were offering me?