240d Engine shakes hard at shutdown

[yoderconsult]

I recently acquired a 1976 240d. It is an excellent runner and I have put on over 200 miles on it. However today the engine has started shaking at the end of the shutdown. I pull the shutdown lever and the engine starts shutting down fine but at the ed right before it stops it shakes rather hard then dies.

Any thoughts would be very appreciated.

[AMSOIL300CDT]

is that a w123???? [?]

sounds like u have a vacuum leak somewhere in the system, by the way..

[yoderconsult]

Actually this is the 115. I believe that in 77 the 240d switched to the 123?

I will troubleshoot the vacuum system. Because the car is running so good and doe snot "run on" when shutting down I had thought that the vacuum system was not the problem, but I am just beginning this journey with Mercedes and am naive :<)

Any tips for doing a quick analysis of the vacuum system? Can I just plug the line going to other than engine functions to see if the problem goes away?

Thanks

[Odrec]

http://www.benzworld.org/forums/forums/thread-view.asp?tid=1183379&posts=4

http://www.benzworld.org/forums/forums/thread-view.asp?tid=1222937&posts=4

http://www.benzworld.org/forums/forums/thread-view.asp?tid=1185674&posts=16&fid=24

I think that in order to find a vacuum leak you need to isolate specific sections of the system and check one by one.

[Ralph69220d]

I don't know the 240d's method of shutting fuel off at the injection pump. Is your pull knob to shut down a coaxial wire cable to a lever on the IP? If so, see if it's pushing the IP Lever fully to the off position. I wouldn't say this is a problem, but inspect both motor mounts and there is a "mount", at least on earlier models, right at the front of the engine that is called an "engine stop". Make sure they are in serviceable condition.

[Otto240D]

I doubt a vacum leak is the source of your problems. If this is a w115 240D the shut down is strictly mechanical linkage from pull start plunger. As Ralph said check the adjustment of the cable to ensure it is shutting the injection pump all the way off. Also as ralph said check the two motor mounts and the engine shock mount up front. If they haven't been replaced in the life of the car they probably need to be.

[Ralph69220d]

Otto240D - 11/19/2005 12:28 PM

I doubt a vacum leak is the source of your problems. If this is a w115 240D the shut down is strictly mechanical linkage from pull start plunger. As Ralph said check the adjustment of the cable to ensure it is shutting the injection pump all the way off. Also as ralph said check the two motor mounts and the engine shock mount up front. If they haven't been replaced in the life of the car they probably need to be.

Yes, and as Otto said, do check both mounts, especially the right mount as it sees most of the motor's torque. The "front mount" is called "engine stop" in the manual. There is an adjustment for this to ensure that the engine/transmission are in proper alignment with the drive shaft, which would cause early failure of the flex disks. The engine stop must be removed prior to changing mounts.