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  #1  
Old 07-10-2007, 10:49 PM
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300E- Wire Placement on Distributor Cap

1986 300e- m103 Engine

Made the mistake of pulling off the distributor cap without noting the placement of the wires.

I expected to find a diagram somewhere in my 3 manuals quickly, but no luck.

I can see from one manual that the firing order is 1-5-3-6-2-4, but how does this map to physical placement on the distributor cap?

I have to know where to place wire #1 for this to be helpful!
Thanks for the help.

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Old 07-10-2007, 11:02 PM
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Look at the black cover that goes over the distributor cap. There may be an embossed diagram there.
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Old 07-10-2007, 11:12 PM
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Quote:
Originally Posted by csnow View Post
1986 300e- m103 Engine

Made the mistake of pulling off the distributor cap without noting the placement of the wires.

I expected to find a diagram somewhere in my 3 manuals quickly, but no luck.

I can see from one manual that the firing order is 1-5-3-6-2-4, but how does this map to physical placement on the distributor cap?

I have to know where to place wire #1 for this to be helpful!
Thanks for the help.
i made this stupid mistake recently as well.

fortunately i have three 124's

if you can't find the way to fix, find a 124 brethren in town...
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Old 07-10-2007, 11:23 PM
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Quote:
Originally Posted by brewtoo View Post
Look at the black cover that goes over the distributor cap. There may be an embossed diagram there.
Thanks for the tip. Alas, no such diagram in my case.
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Old 07-11-2007, 05:22 AM
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The terminals on Bosch distributor caps are clearly marked. Install the cap so the "Bosch" is horizontal and right side up. As you're likely aware the cylinders are numbered 1 thru 6, front to back.
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Old 07-11-2007, 05:54 AM
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For a rule of thumb that will work on any engine, put the crank marker on zero which will put the number one cylinder at tdc. the rotor inside the distributor will be in a particular location. The nipple for spark plug wire to number one cylinder will be right at the point of the rotor. Install that wire in that nipple. Noting the direction that the rotor turns, the next nipple will be for the next cylinder in the firing order, etc.

Tom W
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Old 07-11-2007, 11:14 AM
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Quote:
Originally Posted by Ferdman View Post
The terminals on Bosch distributor caps are clearly marked. Install the cap so the "Bosch" is horizontal and right side up. As you're likely aware the cylinders are numbered 1 thru 6, front to back.
Thanks- I'll check that out. I was working at night with poor light, so no chance of noticing such a thing. I can try looking at the old one for reference. Once the inner cover is on, you cannot see the cap.
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Old 07-11-2007, 12:12 PM
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Click on the lower picture and you'll see a little diagram, which may help, or it may not.

http://www.***************/search/product.aspx?sid=wt42uj55u2514miqfvvh0p55&makeid=800016@Mercedes&modelid=1193813@300E&year=1986&cid=25@Ignition%20Parts&gid=7124@Distributor%20Cap%20Cover
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Old 07-11-2007, 12:33 PM
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You can see where #1 goes in the photo below and you can go from there.

124 distributor cap

Starting at the bottom right (passenger side in USA) it's 1 5 3 6 2 4.
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Last edited by brewtoo; 07-11-2007 at 12:48 PM.
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Old 07-11-2007, 12:51 PM
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Originally Posted by deanyel View Post
Ah yes- looks like #1 is the first stop clockwise from vertical. That would have been my guess with nothing else to go on. That fact that it was a somewhat tight pull for the #3 wire made me uncomfortable with that hunch.

Thanks a lot!

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