1975 9.9 johnson spark leak

[dgassy]

HELP PLEASE <br />points - condensor - plugs -one coil - both high tension wires & boots are new. losing spark out of new coil where high - tension wire screws in.<br />also losing spark out of old coil where high tension wire spark plug boot attaches.<br />Question why is the spark leaking ?<br /><br />Please help if you can.<br /> thanks<br /> dgassy

 

[JB]

Re: 1975 9.9 johnson spark leak

Sorry, DGassy,<br /><br />I don't understand "spark leaking".<br /><br />Are you getting arcing? What/where is the arcing to? Why did you replace all those parts?<br /><br />Welcome to iboats.

 

[BF]

Re: 1975 9.9 johnson spark leak

do you have the plugs grounded while you're testing? If not, (like if they're hangin' in mid air) then maybe you're creating an artificially high resistence for the coil to discharge through, and it finds it's own way to ground.<br /><br />that's my $.02<br /><br />Brent

 

[dgassy]

Re: 1975 9.9 johnson spark leak

1975 9.9 johnson spark leak<br />one of the coils started leaking spark out of the coil it's self while engine was running - lost one cylinder - found leak at night while running in test tank. changed both coils & have had troulbe ever since with spark leaking to ground - extremely noticable at night or with the cover on.<br />every thing that i have changed is from local OMC dealer. parts should be correct, but at night if i move a screwdriver around the plugs - high tension cables or coils i can find spark leaks and using a screwdriver i can kill the cylinders one at a time. the higher the RPM the worse the leak.<br /><br />sure hope somebody can help<br /> thanks dgassy

 

[ezeke]

Re: 1975 9.9 johnson spark leak

Are the wires you used automotive spark plug wires?

 

[dgassy]

Re: 1975 9.9 johnson spark leak

1975 9.9 johnson spark leak<br />yes the wires are automotive - beldon 7mm solid core wires.<br />the wires and boots that came in the boxes from OMC leaked real bad

 

[ezeke]

Re: 1975 9.9 johnson spark leak

Are you using UL81C Plug at .030?

 

[OBJ]

Re: 1975 9.9 johnson spark leak

dgassy.....DO NOT use solid core wires. There is to much resistance in solid core wires. If the wires and boots from your dealer are arcing over, you may have missed the core wire when assembling. The best thing to do is stripe a little of the spark plug wire, say 1/8" and press the spark plug coil, that's the coil with the barb to push through the wire, against the exposed wire and then push the barb through the center of the spark plug wire.<br /><br />When pushing the spark plug wire into the coil, I have found it advantagous to take a small sharp round punch and push it into the spark plug wire first to form a hole. Also make sure the sharp end in the coil hole is centered. If it is not centered, it can miss the center of the spark plug core. <br /><br />Go back to the wires you got from the dealer and follow the above intstructions.<br /><br />And keep us posted as to your progress.....Thanks!

 

[dgassy]

Re: 1975 9.9 johnson spark leak

1975 9.9 johnson spark leak<br />i am using correct parts according to our local OMC dealer - plugs are UL81C - should have said before i have a manual. <br /><br />OBJ <br />thats good info on connecting the wires from the coils to the spark plugs - changed wires back and forth the so much i kinda ruined them -so went to parts store and bought new beldon 7MM wires , plug connectors & boots. did have a hard time getting wires into coils - i thought sharp end in the coil was threaded like a metal screw so wires wouldnt pull off , but i did have a hard time getting wire all the way in - good idea using a punch to enlarge the hole. <br />the plug ends i bought don't pierce the wire - you strip the insulation about a 1/2" and crimp conector onto wire --- short of soldiering i don't know what else to do maybe - dielectric grease ?<br /><br /> thanks for all your help so far guys<br /> <br /> dgassy

 

[dgassy]

Re: 1975 9.9 johnson spark leak

OBJ <br />you said don't use solid core wires - og back to factory wires -- the wires that came with the new coils were just universal cables & appear to be solid core wire - but hey maybe i'm missing something<br /><br /> dgassy

 

[OBJ]

Re: 1975 9.9 johnson spark leak

OK dgassy.....your using stranded core wire...that's a plus. Just as long as the spark plug connectors are solid and making good contact, you should be OK.<br /><br />Don't hurt to use a little grease (dielectric) on the wires when pushing them into the coils. Do it myself.<br /><br />Lets' jump to another topic....air gap on the coils under the flywheel. Do you have them set right? If you have a manual, it should explain how to set the gap with out a special tool. <br /><br />Recheck the point gap and put the boat in the water and see what it does.<br /><br />Keep on postin'.

 

[OBJ]

Re: 1975 9.9 johnson spark leak

Just caught your last post. OEM wires are stranded core. Solid core or carbon cores have to much resistance and will impede current flow. This will make for a very poor spark. The finer the wire in the core....the better.

 

[dgassy]

Re: 1975 9.9 johnson spark leak

my mistake they are stranded wires. motor has been in test tank since it stranded me in the ocean. this is a low tension ignition system & yes i have checked that the coil under the flywheel s adjusted properly , but i don't think that would make the spark jump out of my cables.<br />but i don't know what would<br /><br />still need help<br /> dgassy

 

[OBJ]

Re: 1975 9.9 johnson spark leak

We ain't fergot about ya' dgassy. I posted this moring and for some reason it didn't make the "cut". I probably fergot to hit the reply button.<br /><br />I posted this morning that if the stray sparking along the spark plug wires, you might try to seal the area where the leads go into the coil with some RTV or if you have it, liquid tape. Does the engine run at all? And just as a side question, what spark plugs are you using?

 

[dgassy]

Re: 1975 9.9 johnson spark leak

I'm using UL81C plugs & the engine doesn't run too bad at first or until it warms up and thats when it starts craping out - or spark starts going to ground --- can't understand why spark doesn't want to go to spark plugs. i did use marine epoxy on old coil and it seemed to work --- want to make sure i have coil wire inserted in coil all the way on new coil before using the epoxy<br />thanks<br /><br />dgassy

 

[dgassy]

Re: 1975 9.9 johnson spark leak

almost forgot thanks for all your input fellas. gonna be gone for a few day s on a abaone dive trip - come home for one day and then off to the coast for a salmon fishing trip --so it will be about a week or so before i can reply to all your good input. <br />keep it coming -- has to be something i'm overlookng. <br /><br />dgassy

 

[Reel Appeal]

Re: 1975 9.9 johnson spark leak

dgassy,<br />I have an identical motor to yours and are experiencing same type of problem.The spark(s) is jumping or bridging from the boot down the insulator to the metal on the plugs.I checked everything to no avail.One thing I did is use a inline spark plug tester which made the motor start/run better when in place.I noticed the boot with the tester did not spark jump.The other did and vice versa.Strange eh?It must be resistance.I have blue coils on my motor(Sierra?),not sure.I hope someone can shed some light on this.

 

[OBJ]

Re: 1975 9.9 johnson spark leak

Guys...just for grins....try a set of QL77JC4 Champion plugs set at .030.

 

[Reel Appeal]

Re: 1975 9.9 johnson spark leak

OBJ I think your on to something.I just swapped out those UL81C's(new) for a pair of NGK BR9HS 10's(used).The motor started on the first pull and I did not notice any spark jumping.The motor almost would'nt start with the recommended plugs.So,looks like the QL77JC4's or the NGK's may help.dgassy,dump those UL's and try one of above mentioned.Thanks OBJ...

 

[dgassy]

Re: 1975 9.9 johnson spark leak

hey guys happy to say that i installed some of your QL77JC4's and it's a lot better , but i still have some spark leakage from plug wires & boots. it's a whole lott better but when i put the cover on it starts crappin out.<br />i took my OHM meter and tested the QL77JC4 plug - it had 128 OHM's. the UL81C i couldn't get any kind of a reading at all. what's up with that?<br /><br />dgassy