[W126 Coupe] Distributer cap

[GreyGarageRuss at aol.com]

Thanks to Jonathan.Satish and others who responded to my query (below) on  
spark plugs for my SEC.  I finally found the time to try to install the  W9DCO 
plugs along with new wires, cap and rotor.  I have the new plugs and  wires in 
but my old distributer cap won't come off two of the three screws are  damaged 
and won't turn.  I have been told that I should grind these screw  heads off, 
remove the cap and use a torch to heat the area around the screws to  try to 
loosen them!!  My question is: Is there any other method to  remove these 
screws and if not, will the torch cause any other  damage??  Thanks, Russell
Date: Thu, 25 Oct 2007 00:36:06 EDT
From: _GreyGarageRuss at aol.com_ (mailto:GreyGarageRuss at aol.com) 
I recently  called my local Benz dealer to ask if he had and Bosch W9DCO  
plugs for my  1988 560 SEC and he said he did. When I went to pick them up he 
handed me WR9DC+  plugs. His computer screen indicated that W9DCO'S were Bosch 
#003-159-10-03, the  same number on the box of WR9DC+ plugs. I didn't take them 
and when I got home,  I checked one of the old plugs in my 560. It was a 
WR9DC+. Apparently the t shop  that put in these plugs when I bought the car 3-4 
years ago, used these resister  ones.  My question now, is what is the 
difference....will anything be  harmed...should I change them immediately or stick with 
this type? The car runs  very well as is but I want to do the right thing 
while I am going to put new  wires on. Thanks,  Russell  1988 560 SEC
Date: Thu, 25 Oct 2007  00:42:18 -0400
From: Jonathan <_jhodgman at gmail.com_ (mailto:jhodgman at gmail.com) >
Mercedes has  specified in the past that the maximum level of resistance is 
not to exceed  5Kohms or damage to the ignition componentry could be damaged.
The resistor  plugs on their own have 5Kohms resistance, couple that w/ the 
1K in the wires,  and the 1K in the cap etc and you are well beyond the 
specified maximum.
I  would inspect your cap and rotor while doing your wires..chances are these 
plugs  contributed to your wires demise.  I would remove the plugs and run 
replace  it with the correct non resistor plugs.  Jonathan  Blue Ridge  Mercedes




   
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