View Full Version : Omc 3 lt ign timing

02-15-2006, 08:40 PM
I have an omc gm 3 liter sterndrive and the ignition timing tab attached to the cam gear cover is rusted and completely illegible. Could someone let me know the degree markings on the tab. eg(0 deg tdc what each point is in deg. A picture would be very helpfull. thanks.

tom f
03-01-2006, 06:56 AM
usually 2or4degrees 0 being in middle

03-02-2006, 04:49 AM
there is only one mark on timming cover and one mark on harmonic balancer special tool required to plug into dist to lock out timming with out it you will never timm it correctly the correct timming is @ 0deg tdc periond you should have the tool plugged in allready into dist pigtail that loops and wire going to shift switch disconnect wire and put to 12v you will hear engine lock down now you can set base timming then disconnect wire from power and hook back to shift switch you will hear engine go into normal mode

03-02-2006, 08:06 PM
Sorry I didnt state that it is a 1987 year engine.
The tab on the cover has 6 points on it. distributor is old breaker point type.