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Old 05-14-2011, 03:43 PM
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Join Date: Dec 2004
Location: N.W.Connecticut
Posts: 92
Question on emission Control

80 300 SD 116 In doing my annual valve adjustment I noted that all the emission control lines starting with the top of the valve cover to the various points were all cracked and leaking. I had sometime in the past had to disable the emission control system when a "mysterious something" got plugged up. I decided that it was time to do something to prevent unwanted material from
being sucked into the engine. I started by removing all the bad tubing and hoses. Next I started plugging all the holes they had occupied. At 8:00 PM I was given a "gentle" hint that it was time to quit and I had not had the time to finish the job.As a quicky emergency measure in order to make the car operational I simply plugged the opening on top of the valve cover.(what do I know). Next morning I started the car first thing to see if the valves all work.It starts immediately then immediately stops. And it remains the same till the valve cover plug is removed. I then connect the valve cover connection to the tube at the bottom of the air cleaner. Seems to run normally. Question: why does the engine not run with the valve cover outlet plugged? Q2: any harm in my patch job? Hey, I tried!!

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Willie White
1980 300SD 116
82 D engine and transmission
If something can go wrong--it will
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Old 05-14-2011, 05:49 PM
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Join Date: Sep 2007
Location: Long Beach,CA
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One of our Members explained this to me.

With no place to go the Crankcase Pressure pushed you Vacuum Shutoff into the shutoff direction and it reacts just as if you applied Vacuum to the opposite side of the Valve.

If I plug of the hole in my Valve Cover it takes about 7 seconds before the Engine starts to stumble and act like it is going to shut down.

High Crankcase pressure can also cause Oil top leak out of leaks more and past Seals.
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Old 05-15-2011, 07:58 AM
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Location: N.W.Connecticut
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Thanks D911 That makes a lot of sense. Do you have any indication whether my "fix" is going to cause me further trouble sometime in the future? I hope someone somewhere has
learned something from this.

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1980 300SD 116
82 D engine and transmission
If something can go wrong--it will
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