1967 Evinrude 100 HP timing

[John Freed]

I have a 1967 100 HP Evinrude that has the spark occuring about 45 deg. off. I have checked the distributor mechanically and it is fine. The spark is occuring as the trigger wheel's leading edge is at the sensor. It appears that if it happened at the trailing edge, everything would be fine and the spark would occur as the rotor passed the cap terminals rather than between them. I have good spark from the coil. Could the sensor be partially bad and reacting to the leading edge rather than the trailing? Also, what is the correct rotational position of the distributor housing when aligning the timing belt marks? Idle? Full advance? The factory manual doesn't say. Thanks for your help. John Freed

 

[chris mandella]

Re: 1967 Evinrude 100 HP timing

the points timing is set wit the distributor in the full advance position the belt timing has three marks that should align with each other regardless of the advance possition one on the flywheel,one on the distributer pully.one on the dist.bracket all should line up .if not loosen up belt and set properly .....the points should open the instant the mark,on the pully passes the mark on the dist.bracket it says ''points break'' at full advance.good luck

 

[seahorse5]

Re: 1967 Evinrude 100 HP timing

I have a 1967 100 HP Evinrude that has the spark occuring about 45 deg. off. I have checked the distributor mechanically and it is fine. The spark is occuring as the trigger wheel's leading edge is at the sensor. It appears that if it happened at the trailing edge, everything would be fine and the spark would occur as the rotor passed the cap terminals rather than between them. I have good spark from the coil. Could the sensor be partially bad and reacting to the leading edge rather than the trailing? Also, what is the correct rotational position of the distributor housing when aligning the timing belt marks? Idle? Full advance? The factory manual doesn't say. Thanks for your help. John Freed

You will have to find an established dealer or an old time mechanic. There were service bulletins about this. Back in '67 and in '68 there were power pack style changes and that also meant that the timer wheel had to be replaced also. If I remember right, they were about 45? off. One wheel was silver and one was gold colored on the '67 models.

 

[John Freed]

Re: 1967 Evinrude 100 HP timing

Hi Chris,
Thanks very much for the information. With reference to the timing, are you referring to the lining up of the marks with the engine off or with it running and checking it with a timing light? With the engine off, the manual indicated that I should line up the mark on the flywheel with the mark on the flywheel housing and then adjust the belt so the "points break" mark on the distributor bracket lines up with the mark on the pulley. This is how I have it set now. The other fellow's reply talks about a gold (which I have) and a silver trigger wheel that might be 45 deg. different. Are you familiar with this idea?
Thanks,
John Freed

 

[John Freed]

Re: 1967 Evinrude 100 HP timing

Hi,
Thanks very much for the information. I'll check on the service bulletin idea. I have a gold trigger wheel and it seems that if I had a silver one that was 45 deg. different, my problem would be solved, assuming I have the static timing set correctly.
John Freed

 

[Joe Reeves]

Re: 1967 Evinrude 100 HP timing

PM sent about procedure. Awaiting email reply.

 

[John Freed]

Re: 1967 Evinrude 100 HP timing

Thanks to all who helped me with this problem. I think the key (so to speak) to it is to install a different trigger wheel. The mechanic I'm working with here found a service bulletin that talks about a phase one and phase two ignition system and the wheels have the keyway 45 deg. apart! The OMC part number for the alternate wheel is #510705 and the CDI number is 133-5107. I've ordered one from Marine Engine in Vermont and will eagerly await its arrival to see if that solves the problem. It's sure odd that someone had the mismatched system in the engine, but many mechanics would be easily confused as we were.

I'll let everyone know if this solves the problem.
John Freed

 

[Joe Reeves]

Re: 1967 Evinrude 100 HP timing

The new type metal rotor was an included item with the pulsepack. Strange that someone would install the pulsepack and not the rotor (trigger wheel).

 

[John Freed]

Re: 1967 Evinrude 100 HP timing

Initially, when I didn't have spark at the plugs, I assumed that the original installed (Prestolite) pulse pack was bad. I should have checked for spark at the coil, however. I bought and installed a new CDI pulse pack and it came with a new coil (although the wrong one) and no new trigger wheel. When we still couldn't get spark at the plugs, I bench tested the original pulse pack and coil and found good spark at the coil indicating that someone must have replaced the original trigger wheel before I got the engine (although why I don't know.) That's when we realized that the spark was ocurring, but between the cap terminals rather than at them. So the new trigger wheel with the key 45 deg. different should do the trick. It should be here Thursday so I'll know if the problem is solved this weekend.
Thanks for your help.
John Freed

 

[John Freed]

Re: 1967 Evinrude 100 HP timing

I got 'er running! Installing the silver trigger wheel did the trick. The static timing setup is to line up the flywheel and flywheel housing marks, set the distributor housing against the idle stop, and move the belt so the mark on the distributor pulley and the mark on the distributor housing are lined up. I haven't checked the timing with it running yet, but it seems to run pretty smoothly in a barrel. I had to change the water pump impeller. That's quite a job in itself, especially getting the shift wires through the hole in their rubber housing.
Thanks again to all of you for your help. Hopefully all this will be a help to someone else in the future.
John Freed