'72 Merc Model 110 9.8HP Ignition Problems

[1234Jerry]

Canadian Merc S/N 7000026 matches US Mercs S/N Range 3263263-3482752. Compression test 105 both cyl. Stator coils: High 182 ohms; Low 4780 ohms. Ignition coils: Primary; 0.4 ohms ( Spec 0.2-1.0 ohms??); Secondary; + or - to tower, no reading (Spec 800-1100 ohms??), + or - and tower to ground 563 ohms. Installed new points and condenser. Good blue spark across 3/8" gap. Ran great for 10 mins in tank, stopped(using the choke) and restarted 3 or 4 times then died...no spark in either cylinder. Let cool done overnight...still no spark. Questions: 1. How can I test the ignition module (#336-4516A2)? 2. Is the stator bad? 3. Why no reading on the ignition coil secondary? Any help is greatly appreciated. Thanks, Jerry.

 

[Faztbullet]

Recheck points

 

[1234Jerry]

Recheck points

I didn't pull the flywheel but checked resistance from neg coil wires on both coils to ground by removing the wires from the coils and rotating the flywheel by hand. When points were open, circuit was open, when points were closed(for approx 90 Degrees rotation) I read 0.2 to 0.3 ohms on both the white and brown wires from the points connection to ground. I had set both at 0.020 and tightened them pretty well. I then attached a jumper wire to the negative coil terminal and spun the flywheel with a drill and got a spark when I touched the wire to ground for both coils. I checked continuity on all the ground wires and the kill switch wire and everything looks good. I am really starting to suspect the module but don't know the testing procedure or have any specs for it. I also don't know how many volts the stator is putting out, I only know that it produced a spark when I grounded the jumper wire. Thanks for any help and suggestions are more than welcome. Jerry.

 

[1234Jerry]

Canadian Merc S/N 7000026 matches US Mercs S/N Range 3263263-3482752. Compression test 105 both cyl. Stator coils: High 182 ohms; Low 4780 ohms. Ignition coils: Primary; 0.4 ohms ( Spec 0.2-1.0 ohms??); Secondary; + or - to tower, no reading (Spec 800-1100 ohms??), + or - and tower to ground 563 ohms. Installed new points and condenser. Good blue spark across 3/8" gap. Ran great for 10 mins in tank, stopped(using the choke) and restarted 3 or 4 times then died...no spark in either cylinder. Let cool done overnight...still no spark. Questions: 1. How can I test the ignition module (#336-4516A2)? 2. Is the stator bad? 3. Why no reading on the ignition coil secondary? Any help is greatly appreciated. Thanks, Jerry.

Motor is now running great. DVA reading (Spec 180 to 400Vdc) mine 330 top and 324 bottom. Ignition coil secondary circuit(+/- primary to tower): mine open in bench test or mounted with no wires attached, wires attached 567 ohms. Stator High speed coil (Spec 450-550 ohms): mine(original Merc) 174 ohms. Stator Low speed coil (Spec 3600-5500 ohms), mine(original Merc), 4782 ohms. Module(red, # 336-4516) tested as follows: There are 5 connectors on the module: 1 kill wire(salmon); 2 condenser/positive ign coil wires(green); 3 High speed stator coil wire(blue); 4 Yellow wires(2), 1 from high and 1 from low speed stator coils; and 5 Low speed stator coil wire(red). Results(Vdc): Meter red lead on on 1; meter black lead on 3, 0.554; on 4, 0.558; on 5, 0.001. Meter black lead on 2; meter red lead on 3, 0.572; on 4, 0.571; on 5, 0.001. Meter red lead on 5, meter black lead on 4, 0.558. If anyone can interpret this module diode test, I would really appreciate it just for my own peace of mind!!! All I really did was change the points and the motor is running better than it ever has since it was brand new. I have bought a bunch of new parts because my old ones have metered out of spec only to find that the new parts have tested exactly the same as my old ones. I have learned more about Phasemaker ignition systems than I ever wanted to know, but I hope this rant saves someone some money.

 

[roscoe]

Great.

Now you can come and fix mine.

Runs great, smooth, full acceleration in reverse.

Only get 1/4 or maybe 1/3 throttle in forward and then it bogs down.

Well, glad yours is running well now.

 

[1234Jerry]

Great.

Now you can come and fix mine.

Runs great, smooth, full acceleration in reverse.

Only get 1/4 or maybe 1/3 throttle in forward and then it bogs down.

Well, glad yours is running well now.

Just guessing, but does it sound or feel like something is binding up in the drive train in forward and the extra load is causing it to bog? On another note, I tested my motor Friday on the Saint John River where I live(NB, Canada) on my 1836 Jon boat. I took it over to my camp on the Miramchi River on Saturday to put it on the boat I use for salmon fishing......someone had stolen my boat!!!!

 

[roscoe]

Just guessing, but does it sound or feel like something is binding up in the drive train in forward and the extra load is causing it to bog? On another note, I tested my motor Friday on the Saint John River where I live(NB, Canada) on my 1836 Jon boat. I took it over to my camp on the Miramchi River on Saturday to put it on the boat I use for salmon fishing......someone had stolen my boat!!!!

Well that just sucks. Sorry to hear the bad news.

Mine.... runs just fine, till over 1/4 throttle.
smooth, quiet.
Gonna have to tear her down this winter, do the carb, and closely examine and adjust linkage. I think thats where my problem is.
Just weird that it runs so fine in reverse.

Hopefully we will be back to visit your country next year.
Good luck with your election tomorrow.