1989 mercury 8 hp,no fire,help please

[felderlostnspace]

thanks in advance for all and any response.no fire to the plugs.where do i go to start checking.some body tell what happens first.i think the flywheel turns and the magnet picks up power to go to the coil pack and then the power goes to the spark plug coils and then to the spark plug.am i any where close and does this motor have a trigger.i took this motor off my center console and it was hooked up to a gear box to work the throttle.i put the tiller back on to sell the motor and now i have no fire to the plugs.i dont see where anything i did had anything to do with it not getting fire.any help would be great and thanks in advance,Bill

 

[Don S]

Re: 1989 mercury 8 hp,no fire,help please

Start by disconnecting the stop button and the emergency kill switch and see if spark returns. One or the other going bad is the most common problem.

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

Don,thanks for the response.it does not have a kill switch but does have a on/off switch.so i will disconnect it and see what happens.will let you know and thanks again for the help.my wife is about to kill me over my boat and motor.you may save a life,thanks,Bill

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

Don,i disconnected the on/off switch and still have no fire at the plugs.have you any other ideas i could try?i guess i need to get a mter and start checking from the magnet down?i have no clue as you can tell.any other help would be great.thanks in advance.

 

[Don S]

Re: 1989 mercury 8 hp,no fire,help please

It should have a stop switch in the end of the tiller handle.

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

Don,thanks for the reply,i will go look.my wife is making me go with her to walmart so i'll look when i get back and let you know.thanks again,Bill

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

Din,my wife said for me to look at the switch in the end of the tiller handle while you were being nice enough to help me.i unhooked the swith wires to the tiller stop switch and still no fire.thanks again for the help,what now? if you have the time?any help would be great and thank you.Bill

 

[Laddies]

Re: 1989 mercury 8 hp,no fire,help please

If you have a OHM meter you cn check that system quite easily here the OHM values
Stator--Red coil lead to black coil lead 3200 t0 3800 OHMs/Rx1000= 3.2 to 3.8
Trigger- red lead to white trigger lead and black to black 650 to 850 OHMS/Rx100=6,5 to 8.5
If these readings are OK then the switchbox is bad

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

Laddies,thanks for the response.i guess to check these i have to pull the rope to turn the flywheel to check the power?i am telling you i am lost.thanks for the help.wish i was rich so i could just take it to the shop for repair.thanks again

 

[Laddies]

Re: 1989 mercury 8 hp,no fire,help please

No, don't turn the flywheel while testing for OHM values. if you had a DVA that tests for peak voltage you would need to turn the engine over but with a OHM meter you are simply testing the windings for resistance not voltage output.

 

[Don S]

Re: 1989 mercury 8 hp,no fire,help please

Do you have a red or a black stator? Makes a difference in the ohms values of the different parts

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

thanks,don and laddies,i will try this maybe monday.i'll go to sears and get an ohm meter and check,also will check to see which stator i have which i assume you are talking about the magnet?i'll let you know how it turns out.thanks again for the response and help.Bill

 

[Don S]

Re: 1989 mercury 8 hp,no fire,help please

No, it's not the magnets, it's the stator itself.
You REALLY, REALLY, REALLY, need to get an OEM service manual. You don't have enough info here to know what the proper ohm specs are. They are different between the red and black stators.
Even then, the ohms tests could be fine, but the tests using the DVA meter could pinpoint the problem. The DVA is NOT part of a multimeter.

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

Don,thanks again for the help.i will se about getting a manual and look at it and get back to you.thanks again for the help.Bill

 

[Laddies]

Re: 1989 mercury 8 hp,no fire,help please

Don, there are no red or black stators for the 6 thru 15HP engines that is true on only the larger engines and even if his engine has the newer stator with differant color wire the OHM spec are the same.

Bob

 

[Don S]

Re: 1989 mercury 8 hp,no fire,help please

Bob, I was just reading from the manual (90-827242R02), and it gave information for both Black and Red stators. So I just kind of assumed that they used both. Wonder why they list the red one if it wasn't used??

 

[Laddies]

Re: 1989 mercury 8 hp,no fire,help please

I stand corrected Don, Although I guess have never seen one that was red in color after serial number OG760299 Mercury 6 to 15HP did use a stator with a single winding which is what the larger red stators are, they eliminated the low speed winding

Bob

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

thanks don and bob for the help.i am suppose to pick up my manual tomorrow and will start checking it out and let you know.thanks again,Bill

 

[hkeiner]

Re: 1989 mercury 8 hp,no fire,help please

This website may help with troubleshooting.

'http://dolphinmarineservice.homestead.com/Ign5.html

 

[felderlostnspace]

Re: 1989 mercury 8 hp,no fire,help please

hkeiner,thnaks for the response.i will check it out also.i will let you know what it ends up being.thanks for all the help,Bill