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Well I got a chance to work on the engine noise today with no luck in finding the problem. I looked 1st at the crank bolt to see if that loosened up does not seem so. I then looked at the flex plate bolts they all seemed to be tight. I then pulled the valve cover off checked timing chain stretch by lining up the index mark on the tower seemed like it was about 3 degrees tensioner seeed to have a good amount of tension on chain and guides looked ok what I could see.
valve clearances were all a little tight some intakes at 7-9 mm. and exhausts were in the 22-28mm. range. I e-mailed Kent Bergsma about the noise Kala got back to me that I should inspect cam lobes closely and take a compression test. I will try to do a compression check I think I have a tester from Harbor Freight that will allow me to do it at the glow piugs I think it would be easier to do it at the injectors but I do not think I have the adapter to do it there in my kit. Any one have any other ideas or is there any one that is in the N.W. In. area that has more knowledge on these engines then me? I might have to just throw this valve cover back on and run it till it stops then throw another engine in I'm on my 3rd engine so as it is. At least I have a good place with heat to work on it and I'm off of work right now due to this corona 19 thing. |
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check the 6 small bolts holding the pulley on they can loosen up or shear off and make the sound similar as in your video |
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You might want to at least pull the injectors in order to have a look inside. I had one engine that the glow plug tip broke off, and caused the prechamber to blow out. The pieces of glow plug and prechamber rattling around made a similar noise as your engine. I replaced the engine, and eventually pulled the head of the bad engine to find many dents in the piston, and the blown out prechamber. If this is the case with your engine, it is possible to remove the prechamber, get all the pieces of metal out with a magnet, and replace the prechamber and glow plug/s. If you do a compression test through the glow plug holes (easiest), and find a plug with a missing tip, pull that injector and have a look. Let us know what you find.......Rich |
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Happened on my 240D. Pulley made a similar noise and after many miles it fell off. Sheared off bolts were in the balancer. |
Thank you for the replies I will take a closer look at the crank pulley today. What I intend to do today is set the valves I saw no abnormal wear on the cam lobes yesterday my question is could the valve clearances all being a little tight cause this noise? I intend to set valves and start motor to see if that gets rid of noise what I failed to state yesterday is that when I took the air cleaner off yesterday I was surpised at all the debris that was built up inside of there. The filter was really in bad shape I really dont know how all that debris would have gotten in there I'm thinking could have something mettallic gotten sucked into the engine and caused this noise? Well I have myself prepared for the worst and hoping for the best my next course of action will be set valves restart motor if noise did'nt change do compression test and go from there I hope this engine will live on will keep everyone up to date thanks.
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With those type of debris in the air cleaner, I would drain the oil and remove the oil pan and check carefully for any metallic debris. Besides getting sucked into the air intake, you have the vacuum pump to worry about.
This one may require you checking multiple issues before you find the problem. If you can locate a mercedes diesel engine mechanic who really knows and understands these engines in your area, they can sometimes diagnose in ten minutes what would take you ten days. I've known a few during my lifetime and in most instances, they spoke german better than they spoke english. |
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I adjusted the valves noise is still there as I was listening with a stethoscope noise seemed the loudest on passenger side at the middle of the intake manifold which led me down to the turbo. I have a KKK turbo could a bad bushing or bushings in this turbo cause this tapping noise and if so is there a way I can unhook the turbo and run engine to pinpoint if this is the case of my noise? I have like a little finned cylinder on the compressor of this turbo and it sounds like the noise could be coming from inside there and then is amplified greatly at the middle of the intake manifold then lessens when I put the listening probe tip on valve cover itself. Also when started it after valve adjustment I again cracked each injector to see if noise is at a certain cylinder and noise did not change I guess if the noise were due to bad cam lobes or followers that the noise would not change either. I did see one member had a noise like mine only louder and his was due to bad cam lobes and followers even that the damage did not seem that bad to me by his pictures hhe said it stopped his noise.
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Vacuum pump cam noise?
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Thank-you Vstech Yes I will take a very close look at that I just got off the phone with an old friend of mine also a forum member and he suggested vacuum pump also.
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I take a long screwdriver,and press to engine head,block,turbo,alt,water pump,to listen to noise to pin point it.Use handle at your ear,hold screwdriver tip on the area to check.Manifold bolts get loose from shaking motor too.
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Debris In Air Filter
? Metallic debris ? .
I often find all manner of leaves and twigs etc. because I drive in varied conditions, not just in town where you mostly get dust and the occasional leaf . If you remove the black plastic "U" intake boot you can easily spin the turbo's impeller wheel with your fingers ~ it should be easy to spin with no roughness whatsoever . Ideally it shouldn't have any play, fore/aft up/down but some is normal and unless you have white / blue exhaust smoke the play shouldn't be any issue . The finned cylinder is the waste gate and the nut & screw make for dead easy boost adjusting after you discern and repair this noise . |
To me the noise is at cam speed frequency. That limits options. Since the valve components seemed okay. Almost has to be the vacuum pump?
It depends on if others agree it is a noise at the cam speed. Rather than engine crankshaft speed. It was just a thought if others disagree I have no issues with that. If it where trash in the cylinders for example the frequency of the noise would be faster. |
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