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#1
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OM606 Cam Timing Jumped 20 Degrees
On my way home form vacation last week I was driving down I95 and my daughter mentioned the engine in the '95 E300 sounded loud.
Shortly afterwards I pulled off on exit and it sounded really loud and diesel-ly, link a cold semi truck. The idle was very rough, black and Smokey and it was a pain to start. We drove the next 300 miles home and after looking for all the usual things like clogged filters, air leaks, stuck egr valve, or a blocked exhaust. I was at the end of my rope as to why it started doing this all of a sudden. Just for kicks I pulled the valve cover (and noticed the previous owner had left me a few broken glow plugs, ouch) and checked the cam timing. To my amazement it was at 20 degrees before top dead center. I triple checked it to make sure and looked for reasons why this could have happened. The chain is not slack and there are no loose or broken components that I can find. If there was I'm sure there would have been a catastrophic failure during the drive home. So it is easy enough to unbolt the timing gear from the cam and re-set the timing but without understanding what happened I don't know if it will happen again. Does anyone have a clue? Maybe this has happened to someone else?
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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!) '95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs) Deuteronomy 22:4- "Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again." Last edited by whunter; 01-16-2013 at 04:34 PM. Reason: readability |
#2
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How long have you owned it? Maybe somebody installed a new chain with a link off.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#3
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I've put a little over 30 thousand miles on the car sine I've owned it and this just started maybe 350 miles ago.
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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!) '95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs) Deuteronomy 22:4- "Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again." |
#4
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It jumped time by 20 degrees and you haven't damaged anything... jeeze!
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#5
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I don't know the details but I believe your Camshaft Gear is not attached in the conventional manner as the 617 Engines are.
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84 300D, 82 Volvo 244Gl Diesel |
#6
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Looks a little different.... |
#7
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Remove tensioner, unbolt the cam sprocket, rotate engine forward to TDC, move cam sprocket however many teeth it takes to line up, replace cam sprocket, replace tensioner, check IP timing. If I counted correctly the sprocket has 36 teeth which means a one tooth jump is 10 cam degrees and 20 crank degrees. I'm guessing that maybe the tensioner is weak or one of the check balls got stuck and it depressuized temporarily which allowed the timing chain to jump.
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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!) '95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs) Deuteronomy 22:4- "Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again." |
#8
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It would be wise to pull the chain cover and completely overhaul the system. You just dodged a a really large bullet.
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#9
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#10
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The pointer plate on the OM606 is not like the old engines, its a moveable part, if someone took off the waterpump and removed it without marking its placement relative to the crank pulley it will never show correct engine timing.
I doubt the engine will actually run with 20 degrees off timing, the pistons will collide with the valves.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#11
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The water pump was replaced by the previous owner. I don't know how adjustable the timing pointer is and would only expect it to go a few degrees in either direction. After work today I'm going to check the IP timing and see if it shows the same offset the cam timing does.
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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!) '95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs) Deuteronomy 22:4- "Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again." |
#12
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The same exact thing happened to my 74 240D.
The problem. The key in the governor shaft had plowed the key-way almost half way around the shaft. I remover the shaft and had a machine shop cut a new key-way 180deg from the original. Never could find out what had placed such a tremendous force on the shaft. The difference in timing came on slowly over a few weeks,not all at once. After pulling the rad the job was fairly easy.
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1984 300SD turbo 126 "My true love" God made me an atheist and who am I to question His wisdom |
#13
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Quote:
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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!) '95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs) Deuteronomy 22:4- "Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again." |
#14
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I have made the mistake of looking at cam timing based on the wrong part of the pointer near the balancer. Are you using the blade part as your point of reference?
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250 |
#15
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Yes I am, the part that you cn hardly see because the belt tensioner is in the way.
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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!) '95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs) Deuteronomy 22:4- "Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again." |
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