I have a 1969 65HP Mercury with no spark ?

[Cuxy]

hello, I have a 1969 65HP Mercury with no spark ?

i have no spark at the spark plugs ...

cranks good and strong ...

I replaced some wires that were corroded ..

one i needed to cut out of the plug lug to be able to replace it ...

still no spark ... do i need to replace the magneto or stator ?
(didnt see any coils or power packs like on my johnson )

and if i do how do u remove the cowling to get access to it ...

thank you for ure time

-Cuxy

 

[tmcalavy]

Re: I have a 1969 65HP Mercury with no spark ?

I can't remember when Merc went to their Thunderbolt ignition from the old-style magneto ignition. If yours is a true old-style magneto ignition, you will need to pull the flywheel to get to the coils/points/condensors. It could be something as simple as cleaning/dressing and regapping the points. Might also want to check the condition of the contacts in the distributor cap and the condition of the plug wires...on my old 73 Merc 500 the plug wires unscrewed from the distributor cap, so try that before going gorilla and just pulling on the wires. If it's a Thunderbolt ignition, can't help much other than to say that someone else will be along shortly with the steps to diagnose the problem.

 

[tashasdaddy]

Re: I have a 1969 65HP Mercury with no spark ?

if the wire were corroded, the kill wires to the coils could also be and grounding out the coils.

 

[Cuxy]

Re: I have a 1969 65HP Mercury with no spark ?

I can't remember when Merc went to their Thunderbolt ignition from the old-style magneto ignition. If yours is a true old-style magneto ignition, you will need to pull the flywheel to get to the coils/points/condensors. It could be something as simple as cleaning/dressing and regapping the points. Might also want to check the condition of the contacts in the distributor cap and the condition of the plug wires...on my old 73 Merc 500 the plug wires unscrewed from the distributor cap, so try that before going gorilla and just pulling on the wires. If it's a Thunderbolt ignition, can't help much other than to say that someone else will be along shortly with the steps to diagnose the problem.

my distributor cap has like locking washer around the nuts (alum tabs)...

+ ITS UPSIDE DOWN - under the throttle body ??

how do u remove the cowling around it .. ?

so far mines like 4 different pieces ... (the cowling)

if the Thunderbolt ignition has coils and power packs then this one isnt ...

thank you ....

 

[Cuxy]

Re: I have a 1969 65HP Mercury with no spark ?

if the wire were corroded, the kill wires to the coils could also be and grounding out the coils.

where would thee wires be ?

thank you

 

[Cuxy]

Re: I have a 1969 65HP Mercury with no spark ?

flywheel to get to the coils/points/condensors. It could be something as simple as cleaning/dressing and regapping the points.

that would be great ...

flywheel ?

my distributor cap is upside down under the throttle body ??

 

[tmcalavy]

Re: I have a 1969 65HP Mercury with no spark ?

The flywheel is the big round metal thing on top of the engine, secured by a nut on a shaft. You need a flywheel puller to remove it to check the points/coils/condensors under it.

 

[Cuxy]

Re: I have a 1969 65HP Mercury with no spark ?

The flywheel is the big round metal thing on top of the engine, secured by a nut on a shaft. You need a flywheel puller to remove it to check the points/coils/condensors under it.

now if i have a magneto i wouldnt have coils condenser and such ?

 

[old merc]

Re: I have a 1969 65HP Mercury with no spark ?

You should not have to remove flywheel to get at your magneto. There should be four 3/8" nuts and your magneto will come off the bottom. Check your points. Mine went. on my 66'. 1st thing you need is a manual!!!

 

[Cuxy]

Re: I have a 1969 65HP Mercury with no spark ?

You should not have to remove flywheel to get at your magneto. There should be four 3/8" nuts and your magneto will come off the bottom. Check your points. Mine went. on my 66'. 1st thing you need is a manual!!!

there where like 8 on the flywheel and they where 7/16 ..
under where the coils the were pretty corroded so they got cleaned...

im not sure the how to get access to that magneto its upside down and the lower cowling is in the way ??

how to remove this lower cowling ...

thank you for your assistance ..

 

[Cuxy]

Re: I have a 1969 65HP Mercury with no spark ?

any help here ? pls still no spark ??

 

[Alumarine]

Re: I have a 1969 65HP Mercury with no spark ?

If it's like my 66 if you remove the aluminum frame on the front of the engine (sorry don't know the proper names) that's about a foot high and 10 inches wide it should give you more access to the distributor assembly.

You may have to remove a few linkages and a couple of other things to gain access.

1st time took me about an hour to figure it out. Now about 10 minutes.

 

[OldMercsRule]

Re: I have a 1969 65HP Mercury with no spark ?

If this is a 1969 it has the trigger fired thunderbolt ignition with surface gap plugs, (not the old style magnito). You need to troubleshoot the trigger to determine if the problem is the trigger or the switch box. The procudure is here on this forum. JR