W115 76 240D issues - Mercedes-Benz Forum

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post #1 of 13 (permalink) Old 01-24-2013, 07:55 AM Thread Starter
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Vehicle: 1976 W115 240D
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W115 76 240D issues

Its been awhile since I posted on here... lots of great advice from members here has kept me away and my MB running.... so thank you in advance, I hope I can get some solutions again.
Problem 1. Yesterday I pulled in to my driveway and after shutting the car off I heard some grumbling noise... turned out I left a trail of fluid from the street to my driveway... appeared to be radiator fluid coming from the overflow tube. I assumed a bad thermostat. Picked one up from LPS and installed it...swap out was pretty straight forward no issues. I recently replaced the temperature sending unit also. This morning about 10 minutes into my commute to work, I noticed the temperature gauge readings were all over the place... the needle would jump form 180 to about 200 back to 175 and then 190.... idle or moving didnt make a difference. When I got to work I popped the hood and noticed radiator fluid had sprayed everywhere... Im guessing from the overflow tube again, fluid was hitting the radiator fan... Did I miss something? Could something else have gone wrong?
Problem 2. This has been ongoing. After driving the car for a bit, then placing it in park, the engine revs very high, it just sky rockets. Once I come to stop, I usually shut the car off while in drive... just to avoid it revving so high.
Problem 3. Another ongoing issue. Lots of smoke in idle or mild acceleration.. basically its always smoking except when in Park. I understand under a hard acceleration, it smokes, its a diesel. But this is excessive. The smoke from what I can tell is grayish. Any ideas on this.

Last edited by ArmyAnt; 01-24-2013 at 08:03 AM.
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post #2 of 13 (permalink) Old 01-24-2013, 08:14 AM
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Check the vacuum pump for your idle and possibly the smoke issue.

I believe your model still uses the "gorilla knob", yes? If so, check the hard vacuum line leading to the top of the injection pump for cracks or leaks.

The diaphragm ( I want to know what spelling genius came up with "diaphragm") on the rear of the injection pump can cause the high idle/smoking also.

Welcome back!
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post #3 of 13 (permalink) Old 01-24-2013, 10:22 AM
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problem one.

Change Your radiator cap. Classic cap failure symptoms, I just experienced it two weeks ago on my 90s 4matic
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post #4 of 13 (permalink) Old 01-24-2013, 10:51 AM Thread Starter
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Thanks Mike.
What am I looking for when I check the vacuum pump?

Yes...it uses the "gorilla knob".
I will check both the vacuum line and the diaphragm.

Goodchild... I'll pick up a new cap on my way home. Will just any aftermarket cap do?
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post #5 of 13 (permalink) Old 01-24-2013, 09:53 PM Thread Starter
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Would someone please show me the hard line that comes from the injection pump
AND
the diaphragm behind the injection pump
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post #6 of 13 (permalink) Old 01-24-2013, 09:54 PM Thread Starter
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Or maybe in this photo

Last edited by ArmyAnt; 01-24-2013 at 09:58 PM.
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post #7 of 13 (permalink) Old 01-25-2013, 05:35 AM
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Behind the red oil fill cap on the pump. This is usually a hard plastic line which leads from the intake manifold. It connects to a removable plate on the rear of the pump where the diaphragm sits. Yours appears to be metal which is not unusual. See the line leading from the rear of the pump over to the intake side in picture #1?

It is a governor and controls the injection pump fueling. It limits the amount of fuel through the different levels of vacuum created by the engine as rpms change.

Last edited by Mike D; 01-25-2013 at 06:12 AM.
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post #8 of 13 (permalink) Old 01-25-2013, 05:27 PM Thread Starter
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Mike... thanks. Wasnt surprised when I checked the LPS and they didnt have that size vacuum line. But now that I know what it is and where it is... its next on my list, along with the diaphragm.

Goodchild... I had my doubts about the radiator cap being the culprit...but sure enough, it fixed the problem. Thanks...thats gotta be the all time cheapest problem fixed on that car.

Since I was messing with the car today... went ahead and changed the transmission filter and put in a new transmission mount. What difference in how the gears shift!
Tried installing the motor mounts...think Im gonna have to hire someone. There is absolutely no room to get the old ones out and seems a bit high on the difficulty scale for me.

Last edited by ArmyAnt; 01-25-2013 at 08:53 PM.
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post #9 of 13 (permalink) Old 02-03-2013, 07:39 AM
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In this topic there is some explination on how the governor works:

http://www.benzworld.org/forums/vint...moke-220d.html

The diaphragm is one cause of air leakage, the axle of the poppet cam is another.

An air leak will also cause smoking and high idle.
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post #10 of 13 (permalink) Old 03-07-2013, 07:24 PM Thread Starter
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Parts source??

Anyone have a source for the vacuum diaphragm and the hard plastic line attached to it? Ive looked around...cant seem to find it anywhere.
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