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#1
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What's the clacking! (video attached)
Got a clacking in the ol' slug (1983 240D)
I've done a diesel purge (twice), replaced the injector nozzle from where the sound seems to be coming from 4th cylinder at the oil cover), adjusted the valves (lifters). I even just replaced the front left wheel bearings, in case they were clacking... but no, it wasn't them.. (they needed replacing anyway) So what is the clacking noise in the movie file at www.pauldrayton.com/uploadfiles/clacking.mpg ? (It's a 13 mb video file. A small audio only file is at www.pauldrayton.com/uploadfiles/clacking.wmv for the bandwidth challenged). The sound gets worse when you ride around for a while. When I had the oil cover off while doing the valves, I noticed the bar that goes across the top, above the camshaft, has some play in it at the far end. But nothing that could clack like it does. I didn't know how tight the chain at the front should be (is that the timing chain?), so I couldn't really check it. The sound doesn't seem to be coming from the front though. I've listened with a piece of wood all around the engine. The only place I have heard it as on the oil cover at cyl 4. Could this be the famous nailing? I didn't adjust the bozio nozzle I bought - I just stuck it in. I don't have shims to adjust them anyway - still waiting for the stealership to get them from Deutcshland uber alles. If this is a injector issue, then fine, I'll get them adjusted properly. But it sounds like something moving and perhaps even slapping. Heck, you listen to it and tell me. If a picture is worth a thousand words, then a sound is probably worth about 435 words, so I'll stop typing now. Some advice would be great. This is my work car and I want it working! Thanks Last edited by pdrayton; 04-29-2006 at 05:57 PM. |
#2
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It has a nice diesel sound to it. Except for that clacking sound. Have you tested compression?
You can get a compression tester at www.harborfreight.com. danny
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#3
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FWIW, it does not sound like injector nailing to me, it sounds mechanical. I can't think of anything obvious near the back of the engine.
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#4
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That's definately a wierd noise. It sounds hollow and metallic like something hitting the inside of an big empty coffee can. I don't know if it's mechanical or a byproduct of the combustion process. Have you lifted the hard injector lines one at a time to try to isolate the position of the noise?
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1981 240d Newport,RI |
#5
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Don't listent to me, but I think it's just the normal vibration of the engine makes something clack in the engine bay while the whole block moves a little.
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'81 M-B 240D 4-speed 132Kmi '98 BMW 528i 5-speed/sport 125Kmi '93 VW Eurovan GL 5-speed 166Kmi '00 Hon RC51 '04 Suz SV650 track dog '89 Yam FZR250R |
#6
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Just to rule it out, check the air filter housing to see if it is knocking in its mounts. Mine resonates a loud clack when it is loose. Good luck!
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'82 240D Euro 68K and growing |
#7
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Just to rule it out, check the air filter housing to see if it is knocking in its mounts. Mine resonates a loud clack when it is loose. Good luck!
I was thinking the same thing. Mine had a noise similar to that when I 1st got it. It turned out the air filter bracket had broken.
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84 300D 251K 87 190DT 281K - Sold 06 Ford Escape 172K 94 Ford Ranger 250K 99 Chevy Suburban 181K |
#8
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Not an injector
I'll agree with those saying the noise is mechanical. Check for broken air filter mounts or anything else that could be loose or broken that could come in contact with the engine. It's pretty loud, so I'm guessing that it will be something made of thin (sheet?) metal that resonates a lot when the contact happens.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#9
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Yeah, it sounds like some thing that is attatched to the engine or in the engine compartment. Check the flex joint off the turbocharger (if equipped)
there might be a bracket loose or something...
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RIP: 80 300SD RIP: 79 450SEL 2002 E430 4matic (212,000km) 2002 ML500 'sport' ____________________________ FACEBOOK: PANZER450 |
#10
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Another possibility if your exhaust, maybe the bracket came loose and is rattling. Unlikely but worth a check.
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1985 CA 300D Turbo , 213K mi |
#11
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My car sounded like it had a tin can banging around under the hood shortly after I got it, then the water pump started weeping, so I replaced it (original I believe, it had 214k on it! ) and the can sound was gone! Just an idea, and thats at the front of the engine but sometimes where the sound is coming from is deceiving.....
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#12
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Yeah, there are a lot more possibilities if the sound is from the front of the engine, like the vacuum pump that just ate itself on my 617.
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#13
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Just watched the video and have to admit that its quite an odd sound....the vision I got when watching/hearing it was of something going "scrape..scrape....tap....clank...." inside the back of the valve cover.
Thats what it sounded like to me....what could do that in there? Is that even possible?? Then again the sound could be the bottom of the air cleaner banging on the arm it sits on.....but it seemed like its coming from the valve cover....
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#14
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It sure doesn't sound like an air cleaner bracket to me. It sounds like a loose mechanical part that keeps changing position (maybe rotating), I just don't have a clue what it could be.
Could a loose pre-chamber "ball" make that sound? Just a wild guess. |
#15
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It is almost impossible to determine the source of this sound over the internet. As mentioned, it sounds like something external to the engine.
Get a piece of hose, about 1.25" diameter or so, and put one end in your ear and the other end at various points around the running engine. The hose amplifies the sound and you'll likely be able to home in on such a sound if you are patient with it. It might be beneficial to have the vehicle on ramps so that you can go underneath it while it's running........but.......be careful.......that fan is no pleasure if you bump into it with the hose. |
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