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[erhard]

Can anyone help me with these questions?

1.   What is the order of cylinders in my 1986-420SEL? Is #1 the one on the passenger side at the front of the car, does it go until #4 at that side and then start with #5 on the front of the driver’s side?
2.   The manual says that it takes Bosch W8DC plugs; now it has Bosch W9DC; are they ok?
3.   Which ones are the hotter ones?
4.   What are the gaps for either kind? The dealer told me different gaps than I found on the web, 0.035 vs. 0.032 while now they are gapped 0.050.
5.   How do I take the distributor cap off? The wires will not come off.


Thanks for any help.

[GermanStar]

Welcome to our forum erhard!

1.   What is the order of cylinders in my 1986-420SEL? Is #1 the one on the passenger side at the front of the car, does it go until #4 at that side and then start with #5 on the front of the driver’s side? Firing order is 1-5-4-8-6-3-7-2
2.   The manual says that it takes Bosch W8DC plugs; now it has Bosch W9DC; are they ok? W8DC is the correct plug
3.   Which ones are the hotter ones? The lower the number, the hotter the plug
4.   What are the gaps for either kind? The dealer told me different gaps than I found on the web, 0.035 vs. 0.032 while now they are gapped 0.050. Gap is 0.032
5.   How do I take the distributor cap off? The wires will not come off. The cap is held on with three screws

[drewprof]

5#  The wires should come off. Gently pry a screw driver and leverage them out.