W128 Replacing Points - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 10-15-2016, 11:25 AM Thread Starter
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Date registered: Aug 2009
Vehicle: 2007 SL550, 1996 E300 Diesel, 1959 220SE, 1965 Unimog 404.115-Sold
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W128 Replacing Points

I recently purchased a W128 1959 220SE with fuel injection. The car starts up fine but has a miss and you can smell it is running very rich. I removed all the spark plus to check their condition and found all of them to be wet and black from fuel. The electrodes did not appear to be worn but the gap was very small like .020, so I cleaned them and reset the gap to .028 and then checked the points. The points have a big burn mark on them so I filed them and set the gap and the car runs better but still not good. I have new points being delivered Monday with a new condenser. While cleaning the points I noticed they are some how attached to a shaft in the distributor but I do not see how they are held to the shaft. There is no clip that I can see. I am attaching a pic. Does anyone know how to remove the points on this model? Thanks
Well I am not able to attach the photo for some unknown reason. I will keep trying
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2007 SL550
1996 E300 Diesel
1959 220SE Fuel Injected

Last edited by compconsult; 10-15-2016 at 11:27 AM. Reason: photo did not upload
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post #2 of 6 (permalink) Old 10-15-2016, 01:13 PM
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Originally Posted by compconsult View Post
I recently purchased a W128 1959 220SE with fuel injection. The car starts up fine but has a miss and you can smell it is running very rich. I removed all the spark plus to check their condition and found all of them to be wet and black from fuel. The electrodes did not appear to be worn but the gap was very small like .020, so I cleaned them and reset the gap to .028 and then checked the points. The points have a big burn mark on them so I filed them and set the gap and the car runs better but still not good. I have new points being delivered Monday with a new condenser. While cleaning the points I noticed they are some how attached to a shaft in the distributor but I do not see how they are held to the shaft. There is no clip that I can see. I am attaching a pic. Does anyone know how to remove the points on this model? Thanks
Well I am not able to attach the photo for some unknown reason. I will keep trying
There should be a screw on the points under the condenser wire remove and lift points straight up. There is a pin that holds the points in place on the back.
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post #3 of 6 (permalink) Old 10-15-2016, 03:00 PM Thread Starter
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Date registered: Aug 2009
Vehicle: 2007 SL550, 1996 E300 Diesel, 1959 220SE, 1965 Unimog 404.115-Sold
Location: Oakdale, California
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I already removed the screw holding it to the breaker plate. That did not release the points. They are somehow attached to the shaft that the hole in the spring loaded part goes over the shaft. I have replaced hundreds of sets of points on domestic cars and none are like this set.

2007 SL550
1996 E300 Diesel
1959 220SE Fuel Injected
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post #4 of 6 (permalink) Old 10-18-2016, 05:37 AM
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I e never had this model, but later models have the pin that seats into the backer plate. That is an axis of rotation I believe. The screw will hold it in place and position.

Will the points twist now that you have removed the screw? Or do they still feel fixed in place?

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post #5 of 6 (permalink) Old 10-18-2016, 02:47 PM Thread Starter
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Date registered: Aug 2009
Vehicle: 2007 SL550, 1996 E300 Diesel, 1959 220SE, 1965 Unimog 404.115-Sold
Location: Oakdale, California
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Originally Posted by Fonzi View Post
I e never had this model, but later models have the pin that seats into the backer plate. That is an axis of rotation I believe. The screw will hold it in place and position.

Will the points twist now that you have removed the screw? Or do they still feel fixed in place?
The points are free to move with the screw removed but you cannot remove the points. It seems like something is still attached to the breaker plate. There is a groove in the shaft for a clip to retain the points but the groove does not have anything in it. It seems to me that there must be something else holding the points in place as having just 1 screw does not seem like it would hold them in place well enough. I may have to remove the distributor to find what is holding them.

2007 SL550
1996 E300 Diesel
1959 220SE Fuel Injected
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post #6 of 6 (permalink) Old 10-21-2016, 10:01 AM Thread Starter
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Date registered: Aug 2009
Vehicle: 2007 SL550, 1996 E300 Diesel, 1959 220SE, 1965 Unimog 404.115-Sold
Location: Oakdale, California
Posts: 295
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Well I feel kind of dumb about this issue. After receiving the new points and saw that they are a 2 piece setup what was holding the points to the breaker plate was oil. After pulling very hard on the points they finally broke free. Both contacts had very large burn marks on them and the wire was frayed. The condenser looks to be the original also. Next I need to adjust the timing and see how it runs.
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2007 SL550
1996 E300 Diesel
1959 220SE Fuel Injected
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