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  #1  
Old 02-21-2019, 01:54 PM
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E320 CDI TIMING CHAIN BROKE

My 2005 E320 CDI timing chain has just broken and blew out the top of the upper timing chain cover.

Is it worth fixing? Just turned 200K in mileage.
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2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.
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  #2  
Old 02-21-2019, 02:23 PM
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Thatís surprising and alarmingÖ Do you know how regularly the oil was changed over the course of its life?
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06 E320 CDI "Benson", Platinum Blue, 175k mi
06 E320 CDI "Rutherford", Black, 145k mi
91 300D "Otis", Smoke Silver, 129k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care, getting EXPENSIVE!

Twelve other MB's owned and sold
2002 Honda Odyssey 244k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife
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  #3  
Old 02-21-2019, 02:43 PM
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That isn't normal at all.
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  #4  
Old 02-21-2019, 03:26 PM
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Location: Former New Jersey resident, transplanted to Atlanta
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I recently change the oil, used lubricant molly, level was correct.
__________________
Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.
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  #5  
Old 02-21-2019, 03:35 PM
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Location: Former New Jersey resident, transplanted to Atlanta
Posts: 343
It was a one owner car when I purchased it 15 months ago with extensive service records from Mercedes Benz dealership.
__________________
Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.
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  #6  
Old 02-21-2019, 03:47 PM
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Is it a single or double row chain? Swap in an om606.
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  #7  
Old 02-21-2019, 04:21 PM
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Location: Former New Jersey resident, transplanted to Atlanta
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Itís a double roller chain
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Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.
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  #8  
Old 02-21-2019, 04:32 PM
t walgamuth's Avatar
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Join Date: Apr 2005
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Seems wrong....either very poor oil changes or wrong mileage... or perhaps even more likely someone changed the chain and screwed the pooch.
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #9  
Old 02-21-2019, 04:47 PM
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Oil quality / change interval is about the last reason a timing chain would fail, it does not take much oil to keep things going.

On other brands of engines, I've seen timing chain guides fail then get caught between the sprocket and chain causing the chain to break. You need to remove the valve cover and have a look inside to see what actually caused the failure. I have seen timing chains break for no other reason than metal fatigue.

As for the oil additive, it didn't hurt or help. I use good oil changed on a regular basis and leave it at that.

On some engines, valves can bend if the cam stops turning, this a head off repair. I'm not sure if yours is a bender or not.
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  #10  
Old 02-21-2019, 06:27 PM
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I hope itís not a bender, the car runs with no smoke but I donít want to run it. It looks like something knocked the chain off the sprocket because the chain is still on one roller so I hope that the chain didnít jump time... Thus happened to me once before as I had a 1997 E320 and during a head gasket replacement the shop forgot to tighten the cam bolts and the identical thing happened with the timing chain cover blowing open in the same exact spot. The 1997 resulted in the shop using the insurance and replacing the engine with a $8,000.00 engine
__________________
Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.
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  #11  
Old 02-21-2019, 06:31 PM
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See if the service records involved ANYTHING with removing the camshaft or timing chain
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1997 E300 Captain Slow - 218,000 miles

2000 Mercedes E320 Black - 136,000 miles - New daily driver.

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  #12  
Old 02-21-2019, 06:56 PM
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Location: Former New Jersey resident, transplanted to Atlanta
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The chain hasn’t broken, it jumped off the double roller gear on the cam but the rear part of the chain is sitting on the front of the double roller gear
__________________
Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.
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  #13  
Old 02-21-2019, 07:10 PM
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I'd pull the timing chain cover off to see what is going on. Something caused that.
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  #14  
Old 02-21-2019, 07:22 PM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 33,979
tensioner fail?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #15  
Old 02-21-2019, 08:07 PM
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Whatever happened, it IS worth fixing in my opinion.
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