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#1
11-02-2008, 01:53 PM
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300SDL Knocking
My father's 300SDL knocks when is cold even with all glow plug change and injector change, when its warmed up (81*C) is still knocks, but (here is the twist) when driven a long time like highway or in town for 20 min, the sound Magically disappear and will never appear until the next day (overnight), what could be the problem...
Other note no blow by glow plug just changed Replaced Injector Pop tested and is ok...
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN  1995 E320 SE 220k mi 1984 300SD 350k mi 
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#3
11-02-2008, 02:05 PM
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Here's a thought - it may not fix it, but it's cheap and may - if not, then start spending money. If he's not already using RedLine Diesel Fuel Catalyst, pick up a bottle (most Pep Boys, etc carry it). Dump one full botle in with a tank or less of fuel and drive it a while - the hammering may go away - if it does, then use it thereafter following the instructions on the bottle (one bottle treats 100 gal diesel). Also, if it smokes on acceleration, it will stop the smoking after a few tanks. We've used it in both our diesels since new - neither car smokes even on heavy acceleration.
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Houston, Texas 1984 300CD 235K miles, Elvira, one owner 1987 300TD 180K miles 1974 TR6 78K miles Sarah Jane, one owner OBK #27
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#4
11-02-2008, 05:15 PM
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Quote:
Is it a lifter tap or injection knock? Try losening the hard lines one at a time and seeing if you can't isolate the cylinder.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#5
11-02-2008, 05:51 PM
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Yes we use mobil delvac i think that is syn oil, The belt tension spring has been changed... I ll take a look into the injectors
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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#6
11-02-2008, 06:34 PM
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Ok so we just cracked the injectors, and is seems that injector 2 near the oil filler cap When open stop that knock, but when we open the 6th the one toward the fire wall, another clack stopped, they were all shooting fuel and some bubbles, i guess i should do a pop test on those two injectors, b4 digging deep
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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#7
11-02-2008, 06:54 PM
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First swap them out with cylinder 1 and 2. See if the knock follows them. If it does than you know its the injectors for sure.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#8
11-02-2008, 07:06 PM
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Try doing a diesel purge first. Then if the injectors are still nailing, Take them out and soak them in B100. The BioDiesel might loosen up the carbon.
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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