What does this sound like to you?

http://media.putfile.com/350-Klock

I call it the 350 "Klock".

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

I recorded this using a digicam and 5/16th's rubber hose below the #1 cylinder for sound amplification.

(last time I edit my posts, I promise!)

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

It could be quite a few things.
My first thought is the the vacuum pump. Since your tube was near the #1 cylinder. You can pull it and visually inspect it. Make sure the ball bearing assembly and levers are sound.

Other considerations are the cam lobes. But I think that would be continuous, not intermittent as it was.

What is the compression on the #1 cylinder. The piston could be slapping the cylinder wall, had this on the 300SDL.

What is the condition of the valve adjustment, when was the last time is was done. Again not convinced about this one, not a continuous noise.

Again, I would start with the vacuum pump.
Get the gasket, pull the unit and look so see if the lever assembly is sound.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1O302NZZC1O302O452&year=1983&make=MB&model=300-DT-001&category=All&part=Diesel+Vacuum+Pump

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

Sounds like my 300D used to. Then, I added a gallon of filtered wvo, and not only did the "klocking" go away, it idled smoother in general.

If you're not up to trying vwo, them how about a quart or two of transmission fluid? It's worth a try, I think.

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D

I call it the 350 Klock because, it is of my 350SD. Compression is nill in cylinder #1. I have a problem recording the metallic clanging underneath the injector(positioning the hose is difficult while holding camera and other end of hose to the mic), but it gets worse when I rev the engine. You can hear the metallic clanging more robustly in the last few seconds of the recording.

I will try for a better recording tomorrow.

I kept altering the position of the hose, THAT'S why it was intermittent.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

1987 300SDL had same noise.
Was #5 cylinder piston. Rings had siezed in piston lands and bore was scored.

The noise is piston rock at TDC on compression stroke....piston is knocking against cylinder wall.

If you remove the injector and idle it again, the noise will have gone away.


.

__________________
[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."

I know that this post is 9 years old, but why didn't anyone tell the person with the problem that putting transmission fluid in their fuel would cause the vehicle to smoke so much that they couldn't even drive it.

I don't think that it is funny to provide bad information to the ignorant. I think that it is evil to stand by, write nothing and allow a jerk to do this to a newbie.

I am referring to this post:

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Sounds like my 300D used to. Then, I added a gallon of filtered wvo, and not only did the "klocking" go away, it idled smoother in general.

If you're not up to trying vwo, them how about a quart or two of transmission fluid? It's worth a try, I think.
__________________
"...rationality of thought imposes a limit on a person's concept of his relation to the cosmos." -Nash

04/71 280SE 195k
09 Jetta TDI

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1986 300SDL
1987 300SDL
1997 F-350 Powerstroke Turbo Diesel
1969 32' Luhrs Perkins HT3.54M Turbo Diesel
WVO & biodiesel when I can get it
(there is a de-facto ban on biodiesel in CA
- ask the Water Quality Resources Board why
underground storage isn't allowed for biodiesel -
heck, you can drink the stuff )

people have run crazier fuels, i wouldn't be surprised if it worked OK.

sveinn, where is your information on underground tanks from?
the rules i found sound reasonable:

http://www.waterboards.ca.gov/water_issues/programs/ust/docs/biodiesel_regulations%20letter_1_20080229.pdf

Clarification of Regulations Applying to Biodiesel-E Stored in Underground Storage Tank Systems (PDF) Exit EPA Disclaimer (3 pp, 44K, About PDF)
Prepared by the California State Water Resources Control Board, this memorandum clarifies state regulations pertaining to storing biodiesel in USTs.

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'77 240D, 504H, OM617.952, etc.