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#1
12-09-2007, 05:20 PM
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79 300d smoke, trouble starting, loss of power
I have a 79 300d with about 160k that has been having some new issues lately. I think it started when the car overheated on a long trip a few months ago. Since then it has progressively gotten smokier and lost some power. As the smoke has gotten worse the fuel economy has also gotten worse and it idles fairly rough. It is especially lacking in acceleration from about 0 to 10mph. The smoke is whitish grey in color and is especially bad when starting. I've read on here that this may be a coolant issue which would make since as it has also started going through coolant fairly quickly and I can't find any leaks that would explain the amount that is lost. Starting is also a problem - it used to start alright down to maybe 20 degrees, and it is currently about 34 and it won't start. Recently it has also been skipping some cylinders right after starting. After it warms up a bit they all fire. It has a good alternator, battery, and glow plugs(the pencil style). It is also overdue for a valve adjustment. Any advice/things I should check?
Thanks 
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#2
12-09-2007, 05:32 PM
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After the valve adjustment, do a compression test. Check color of oil. Perhaps a new head gasket is in order.
__________________
83 SD 84 CD
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#3
12-10-2007, 07:46 AM
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Quote:
Yes I agree with toomany .....A diesel compression tester and a mighty-vac should be in every MB owners tool box. The compression tester I have came from Harbor freight. Only around 25$ and comes with all the adapters to fit the older Mercedes Diesels. No it's not the highest quality tool in the world.... but it works well. Compression IS everything with a Diesel !!
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"Any sufficiently advanced technology is indistinguishable from magic" -Arthur C. Clarke "I won't be wronged. I won't be insulted. I won't be laid a hand on. I don't do these things to other people. I require the same from them." --John Wayne. OBK member#16 77 300D 75 300D (rusty parts car) 73 220D (Dad's) 98 Jeep Grand Cherokee 82 Kawasaki M1
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#4
12-10-2007, 11:33 AM
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Check for milky colored oil first......
__________________
Jimmy L. '05 Acura TL 6MT  2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China"  Scar engine installed'81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John
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#5
12-16-2007, 02:37 AM
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Thanks for the suggestions... I adjusted the valves today(that sure was a painful process - having the nice bent wrenches probably makes it a lot easier though) and now It's running great. It has way less smoke, way more power, and runs quite a bit cooler. I didn't realize that just adjusting the valves could fix all that.
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#6
12-16-2007, 10:41 AM
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They must have been way tight. Did you check "chain stretch" while you had the valve cover off?
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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