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  #1  
Old 09-17-2020, 08:45 PM
j-galap's Avatar
Strich Acht
 
Join Date: Aug 2018
Location: Istanbul / Vancouver
Posts: 268
Mercedes W115 240D engine stop gorilla knob

Hi folks,

I've been having some issues with the engine shut off gorilla knob in my 1974 240D W115.



When I first got the car I had a lot of problems with grey smoke and a high idle in park/neutral.

At that point, when I pushed in the gorilla knob I could shut off the engine - but only when the engine was cold.

However, when the car got up to full operating temperature, the idle in park/neutral would sit at about 3500rpm (and it would create an unburnt diesel cloud out of the exhaust), so when I pushed in the gorilla knob, the idle would go down a bit, but not enough to stop the engine.

As well as this, the idle control screw on the dash did not do anything to change the idle when turned.

--

Last week, I replaced the governor diaphragm in the injection pump. This has completely solved my grey smoke/high idle issue. As well as this, the idle control screw on the dash operates normally. It's great.

However! Now, the gorilla knob will not turn the engine off at all, even if the engine is cold.

Here's a video of the injection pump end of the gorilla knob wire in operation:
https://youtu.be/Jjhl7_Qx51Q
(note, the washer/cotter pin on the fixture is definitely not the original one - whether or not that would make any real difference I doubt)

Now, the only way I can shut the engine off is via the emergency shut off lever on the throttle body. Before this, I used to turn the engine off by stalling it (turn off the ignition, press in gorilla knob, hold on the brake while in gear). After the new governor diaphragm, this method no longer works. Additionally, I have to put a heck of a lot of pressure on the emergency shut off to kill the engine. It's like it doesn't want to shut off at all.

It's a strange problem. The car runs and drives beautifully smooth now. But now I'm that super cool guy who nonchalantly pops the hood and turns his car off from the engine bay every time he parks (and this car is my only car)

This is fine for now but it will soon get old - especially when the weather turns...!

Any thoughts?

Thanks!

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  #2  
Old 09-18-2020, 10:57 AM
gmog220d's Avatar
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Join Date: Apr 2006
Location: Albuquerque, New Mexico, USA
Posts: 947
I looked at the video and don't see anything obvious. It appears to be adjusted more or less correctly. You could double check it using the following information:



If you cannot adjust the wire coil forward enough to make it stop and still have some play between the eyelet and lever then you probably need to focus on the bracket that's connected to the back of the IP, where the cable attaches. This piece is made of two steel parts with rubber bonded between them. I've seen the rubber dry out and separate from the steel pieces. I've also seen the rubber swell up and become soft from exposure to fuel/oil. Either scenario leads to not being able to adjust the cable far enough forward to stop the engine.

If this is the case in your car I see two routes forward. One way would be to replace the bracket with a new or good used part. Another would be to repair it. See the image below for one idea on how to do that:



Not sure what engine is pictured there, but I've seen that style bracket in a mid-60s Finny diesel. I've also noticed that the bracket in my '74 has some vestiges of that old style still built into it, namely three holes through the steel part of the bracket that attaches to the IP. So a possible fix is to remove the crapped out rubber and replace it with three screws/nuts running through sections of hose. In my car I'd have to drill the three holes in the part of the bracket where the wire coil connects. I suppose you could leave the old rubber in place and drill holes though it, too.
Attached Thumbnails
Mercedes W115 240D engine stop gorilla knob-start-stop-adjust_01.jpg   Mercedes W115 240D engine stop gorilla knob-start-stop-adjust_02.jpg  
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1973 220D, The Prodigal Benz
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Old 09-18-2020, 12:17 PM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 5,358
Double check your fast idle cable adjustment.

Ya know, there's just no pleasing some guys. First you're unhappy because the car won't start, NOW you're unhappy because it wont stop!
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Old 09-18-2020, 01:22 PM
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Strich Acht
 
Join Date: Aug 2018
Location: Istanbul / Vancouver
Posts: 268
Quote:
Originally Posted by Mike D View Post
Ya know, there's just no pleasing some guys. First you're unhappy because the car won't start, NOW you're unhappy because it wont stop!


Tell me about it. My wife has recently started calling the car my second wife... oops
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Old 09-18-2020, 06:31 PM
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Join Date: Apr 2006
Location: Albuquerque, New Mexico, USA
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Quote:
Originally Posted by j-galap View Post
My wife has recently started calling the car my second wife... oops
At least it's fun and harmless for all three of you to spend time together!

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