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#1
07-08-2006, 06:08 PM
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need overhaul ???
I have been noticing excesive gases and pressure coming from the oil cap of my w123. I have driven the motor for about 150k, yesterday the engine would not start at all, my mechanic tells me it needs an overhaul. how can I measure the compression in this motor. Any ideas will be appreciated.
Thanks mario T Martinez mariotms@yahoo.com 
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#2
07-08-2006, 06:09 PM
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how much blowby from the oil cap? post in diesel discussion so we can figure out what is up
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#3
07-08-2006, 11:14 PM
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A diesel needs three things to start(cold). Glow plugs, fuel, and compression. I would check the glow plugs first, and then the fuel filters. Improperly adjusted valves can give low compression readings that make the engine hard to start. If the car was running one day and not the next, I doubt internal engine wear is the cause. If I has to guess, you may have two or more bad glow plugs.
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#4
07-09-2006, 12:17 AM
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Mr Holmes
thanks for the reply!!!. I just put a brand new set (4) on and no change. it is the second time it wouldn't start. last time my mechanic applied 24 volts to the starter and was the only way I got it going. Overall i noticed lack of power on the road. Could it be it needs a valve adjustment?
thanks
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#5
07-09-2006, 12:41 AM
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Quote:
There exists a gauge to measure blowby in diesels,saw one once,screwed in inplace of the oil cap,although ANY excessive pressure will make itself manifest,I suppose experience is the key here. Granted,you'd need an awful lot of blowby to prevent your diesel from starting. My first diesel was an old 240 and what gave the game away was the distressing fact that,although she started perfectly when cold,when the motor was hot and I had just climbed a hill she would stumble and literally choke on her own combustion gasses and stall at idle immediately afterward. Only 175K on the clock when this occurred but lack of maintenance was likely the cause,sometimes a little detective work is in order. What's the history of this car??
__________________
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#7
07-17-2006, 12:03 PM
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Moved to Diesel Discussion.
__________________
Chris 2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package 2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options 1998 E430 - sold 1989 300E - 333,000 Km - sold 1977 280E - sold 1971 250 - retired "And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon
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#8
07-17-2006, 02:55 PM
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When was the car's last valve adjustment? If they're really out of whack (over 15-20k since the last adjustment) then they reeeally need to be adjusted, and could be a big part of the problem.
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#9
07-17-2006, 03:43 PM
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Grab up one of the harbor freight compression testers and check the compression. Most accurate way to find out if an overhaul is in your future. Do this after the valve adjust though since tight valves will give a false reading.
For a quick test, plug in the bock heater. Let it sit for a few hours to get nice and warm. Then try to start it. If it starts when warm like that you really want to get that compression test done! An old 300D of mine went south on me and for about a month the only way I could get it going was the block heater. Compression results on that motor were sad to say the least!
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