'85 300D Broken Timing Chain? - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 11-26-2008, 12:09 AM Thread Starter
Lon
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Post '85 300D Broken Timing Chain?



1985 MB 300DT. I think my timing chain broke today. The car has been starting rough,and I just read another post (too late obviously) that the clatter I heard upon start up was my timing chain on it's death bed. Earlier today I heard a sound like running over a cardboard box, and then nothing. Dead on the side of the road. Assuming my timing chain did break, another post suggests I just destroyed my engine beyond repair.

Any suggestions?
Is there any hope?
What am I in for?

Much Thanks,
Lon.
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post #2 of 6 (permalink) Old 11-26-2008, 09:58 AM
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Broken timing chain on diesel grinds valves against pistons. Not a pretty picture. What is the mileage? Most of the time the chains on those engine outlive the 500k-700k lifespan.
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post #3 of 6 (permalink) Old 11-26-2008, 10:37 AM Thread Starter
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Only 190K miles. I think my vacuum modulator has been week for some time. I read somewhere that this may have been a contributor? Oh boy, can a mechanic easily see if there is valve and/or piston damage? Thanks for your reply. I'm sweating bullets.

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post #4 of 6 (permalink) Old 11-26-2008, 11:54 AM
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Would be very rare to see broken chain on diesel with only 190k. Vacum has nothng to do with timing chain. Depends on the engine, sometimes you can see chain thru the oil filling hole. Take good flashlight and take a pick. Good part is, that those older engines can by bought from the recyclers very cheap. Not like 5 figures on newer ones not counting computers.
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post #5 of 6 (permalink) Old 05-22-2013, 06:34 PM
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Greetings
On the subject of timing chain problems... Does the timing chain get it's tension from internal oil pressure? I recently punched a hole in my sump pan on a road I SHOULD NOT have traveled. ( did stop in time to watch the rest of the crankcase oil drain)
The engine never over heated, but it did stall out. Got towed home, replaced pan and oil, and still no oil pressure. Dropped pan again to find that I broke the pump as well. Found a NEW 'old style' ( my Benz is a 300D NON TURBO ), installed it and restored to excellent oil pressure.
PROBLEM: Car barely started on ether, ran rough and blew black smock. Test drive revealed total lack of power( eng ran great before the rock incident)
Question: Could the timing chain have jumped a tooth on the sprocket due to loss of oil pressure causing the tensioner to fail?

Please advise... before I order a new timing chain or A NEW ENGINE THX! NKB
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post #6 of 6 (permalink) Old 05-22-2013, 08:15 PM
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What year?
Fill up the profile, so we don't have to ask those questions again.
When you found broken oil pump, you should inspect the rest of the engine. The pump doesn't fail for no reason.
And yes, the MB tensioners are using oil pressure, although I did drive 87 300 diesel with broken oil pump for few seconds and the chain did not jump.
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