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#1
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Newbie Knocking Question
New to Mercedes Diesels and have been looking and listening at the threads on knocking. Could anyone tell me if I have a knocking problem, I know that there is considerable fidelity loss in using utube however the video is very close to how the engine sounds.
Video http://www.youtube.com/watch?v=HLGMPZh9GS0 1983 300sd compression 1 =280 2=300 3=300 4=320 5=280 Oil pressure looks good just under 3 at idle. On a gas vehicle I would suspect a rod bearing however the oil pressure is to high (not sure for diesel) Also did the valves and diesel purge Thanks |
#2
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sounds ok to me, If the oil pressure is holding then I wouldn't suspect a bad rod bearing. Have you tried to further investigate the sound? Have you adjusted the valves or checked for injector nailing?
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1984 300SD aka "Sweat and Tears" 2002 Honda CBR F4i "Rising Sun" 2005 Yamaha V-Star Custom "Badass Cruiser"
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Sounds like mine does. I have suspicion that one injector is nailing, I changed all five nozzles to monarchs and one leaked after the install, no matter how many times I dissected, cleaned, reassembled, and retorqued. I was moving from Portland to phoenix at the time and couldn't afford to leak fuel on the drive, so as any sane benzer might, I pulled an injector from a junkyard and popped it in mine. say... I need to get that sucker situated...
I wouldnt be too paranoid about the noise. but be sure to check that loose nut behind the wheel
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'79 240D '79 300SD those that are missed: '80 300TD bandit '76 300D cleta jill Last edited by hoborobot69; 10-13-2008 at 01:17 AM. Reason: edit |
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You sure about those compression numbers? Aren't those rather low? From the video it sounds kinda like worn injectors.
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#5
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sounds normal, take the car to a shop and have them install new injector nozzles. It shouldnt be any more than 120$ tops and it should purr.
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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? As long as they would add one additional commandment for you to keep thy religion to thyself. George Carlin (Wonder where he is now..) 1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won. pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt. |
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Thanks I think Ill replace my injector nozzles when i get a spare $150. dont think ill have a shop do it though.
Any advice on what brand? It looks like there is a post where the guy really likes the Bosio nozzles. Also I misstated in my original post the oil pressure. After driving around in traffic today and on the freeway it looks like my oil pressure is just under 2 not 3 at idle. Hope this is not indicative of a failing rod bearing. |
#7
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1.5 bar at idle (and at operating temperature) is perfectly normal, no reason to be concerned about that.
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1984 300D Turbo, 326000 Km, Thistle Green Metallic |
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Quote:
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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? As long as they would add one additional commandment for you to keep thy religion to thyself. George Carlin (Wonder where he is now..) 1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won. pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt. |
#9
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Where do you guys get your nozzles from?
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles |
#10
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I got a set of Monarchs from C Sean Watts in North Carolina. Brand new, no junk. Runs really well, reduced smoke and improved mpg. I actually thought my fuel guage was stuck for the first 100 miles or so! Sean is a member of this forum.
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1998 E300D, 287k, barely broken in. |
#11
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I replaced my 603 nozzles with a set from Sean about 2 weeks ago. No issues, car runs well. |
#12
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How much for a whole set? (If you don't mind me asking...)
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles |
#13
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253 plus 50 core if you don't send in your old ones, plus 10.50 for shipping. Worth every penny.
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1998 E300D, 287k, barely broken in. |
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