Merc 3.0 timing question

[atthelastminute]

Hopefully this isn't too stupid of a question. When setting the timing on my engine recently I couldn't see the timing mark with the light on the #1 wire. I tried #3 and nothing, then #4 and I could see it and set the timing in the correct range. I assumed that I had the firing order backwards, but then figured out that I did have the order right. I checked the rotor position to the timing mark, and at 0 on the timing mark the rotor is pointed at the #1 wire, and the engine is running good. Long story short, I found one post here referring to using the #4 wire to find the timing mark, but no explanation as to whether that indicates a problem or what. Any help would be appreciated.

This is a points ignition on an '85 3.0/140. new rotor, condensor, cap, wires, etc. Set dwell before setting timing.

Steven

 

[Haut Medoc]

Re: Merc 3.0 timing question

1-3-4-2.....
To find TDC on the #1 cylinder, pull the plug & rotate the engine until compression is felt as the timing mark approaches '0'....
This is TDC.....
Your rotor should be pointing at the #1 post on the dist. cap....
It should be easy to properly time it from there with the inductor for the test light on the #1 wire....​