91 560 sel acting up after tranny swap ! - Mercedes-Benz Forum
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post #1 of 37 (permalink) Old 07-08-2019, 03:28 PM Thread Starter
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91 560 sel acting up after tranny swap !

Hi i have a 1991 560 sel that had a dead transmission so i decided to do the swap myself . I have never done a transmission replacement before but am mechanically incline so i figured "what the hell". Long story short i was able to swap the tranny out but when i go to start the car it runs rough almost like its misfiring!? Before the tranny swap the engine was mint,it idles at 800-900 rpm which is good but when i go to accelerate the car studders and struggles to rev ?? i was told perhaps i installed the ring gear on my flex plate wrong , i guess theres little holes that need to line up ? if anyone can point me in the right direction that would be amazing.
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post #2 of 37 (permalink) Old 07-08-2019, 08:33 PM
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Bummer! Yes, the flywheel has to be properly keyed to the crankshaft. The crankshaft position sensor reads signals from the rotating flywheel and sends them to the EZL, telling it that the engine is rotating, where tdc is, and to fire up the fuel pumps and to set the ignition/timing, I think. If you have the flywheel in the wrong position, the computer will be confused and the timing could be off.

Take a look around the internet. I THINK I read that you can just back the trans out a little and reposition the flywheel. Not sure about that.

Good luck!
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post #3 of 37 (permalink) Old 07-08-2019, 08:41 PM Thread Starter
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Thanks for the info luckymike I think that’s exactly what’s going on with my sel . It feels like a misfire or timing issues . Ok so I got to pull the tranny again great! I’m going to attach a photo and could you tell me if that’s how it looks when it’s keyed.
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post #4 of 37 (permalink) Old 07-08-2019, 09:54 PM
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I'm afraid I don't have direct experience with this but in reading the last page of section 03-430 of the manual, it looks like your pic might be right.
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post #5 of 37 (permalink) Old 07-09-2019, 06:38 AM
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Quote:
Originally Posted by Lowredeyes21 View Post
Hi i have a 1991 560 sel that had a dead transmission so i decided to do the swap myself . I have never done a transmission replacement before but am mechanically incline so i figured "what the hell". Long story short i was able to swap the tranny out but when i go to start the car it runs rough almost like its misfiring!? Before the tranny swap the engine was mint,it idles at 800-900 rpm which is good but when i go to accelerate the car studders and struggles to rev ?? i was told perhaps i installed the ring gear on my flex plate wrong , i guess theres little holes that need to line up ? if anyone can point me in the right direction that would be amazing.
These pics are courtesy of member liviu. The holes to be aligned are clearly visible in the pics. We were able to line them up without removing the trans again. If the ring gear and flex plate are not lined up, remove all the bolts from the ring gear turn the crank clockwise so the hole in the flex plate is at six O’clock position then line up the hole in the ring gear to hole in flex plate and secure the flex plate to the ring gear. Believe me it’s doable.
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post #6 of 37 (permalink) Old 07-09-2019, 11:54 AM Thread Starter
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Thanks a bunch man ! I definitely didn’t line up my holes correctly. So what your saying is undone the 3x 10mm bolts and the 6x 13mm torque converter bolts and turn the engine until everything is lined up? I’m having a hard time picturing how this is going to work exactly without separating the transmission from the engine a little .
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post #7 of 37 (permalink) Old 07-09-2019, 12:38 PM
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Once you remove all the bolts from the ring gear, it and the crank will be free of the torque converter. At this stage turn the crank from the 27mm crank bolt clockwise until you see hole in flex plate. Then rotate by hand the ring gear to line up the hole in the flex plate. Do not forget to fish out the three nuts that will fall to the bottom of the bell housing. Those three nuts and bolts are only there to ease assembly. I left them off with absolutely no consequences. No need to separate. There is enough play in the torque converter to allow movement for what you need to do.

Last edited by gogi; 07-09-2019 at 12:45 PM.
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post #8 of 37 (permalink) Old 07-09-2019, 12:50 PM Thread Starter
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Ok thanks for the advice , I will attempt to do what your saying .
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post #9 of 37 (permalink) Old 07-10-2019, 11:31 AM
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Garage

John

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post #10 of 37 (permalink) Old 07-10-2019, 12:34 PM Thread Starter
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I can’t really tell in the pictures how the orientation goes . Have you seen the other thumbnails ? Is that how it should line up
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