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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4 > ignition
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Topic Review (Newest First)
02-10-2011 05:14 PM
thekeip One of the things that you need to check...most easily done if you have a voltmeter installed on your engine control panel...is that there is electrical activity at the panel at all when the engine quits. Often, VERY often in fact, the ignition switch fails...not the coil. You can see if that's the case just by looking at the meters. Sometimes you can "correct" the problem by jiggling the switch a little. No activity at the panel, no activity at the coil either.
Howard Keiper
Berkeley
02-08-2011 05:58 PM
centaursailor Did you replace the heavy insulated cable between the coil and rotor and rotor and spark plug. Often the insulation breaks down and the spark is lost to an earth on the metal body. It can be intermitent depending on the positioning of the plug lead.
02-08-2011 10:08 AM
QuickMick havent solved her yet... the replacement points i got have a plastic doo dad for the wire--as opposed to the 'nut' on the original. im going to order a new set from moyer. the old ones are clicking, but while set just right, they are slightly askew. may get a cap/rotor from them while im at it. my mech buddy who is helping me just had rotator cuff surgery so is out of the loop for a bit. ill keep you posted. i also found a 'mystery wire' the PO installed that is not on any schematic i have! the joys of trying to get inside the mind of a PO (an obvious loon)
01-29-2011 11:23 AM
HDChopper After being in the Hogg bissness over the years ...you would be suprized how many COILS are "bad in the box" this is not to say a bad one wouldnt start & run an engine ... Just that new in box mesurements with the correct meters I found 1 in 14 that was perfect ...and yes the store will sell all of them , go figure....

Plenty one can do to a cap & roter bug to make them better parts ... but would take wayyyy to long to say here ....just to be simple here .. keep an old cap cut it in half or so just so you can see the bug strike buy the pole & allways pick a bug that comes closer to the pole without hitting it ...


Plenty of little things to do to help old type engs....if you can find another bug that fits great and has same dim. ( even tho it is for another eng) it may have a longer arc shaped striker play with it and you might be suprized how well your eng runs with it ...normally this would add + or - timeing by 2-4* and a longer spark burning time for better fuel burn...just make shure the burn doesn't continue into the intake valve opening phase..

Ok thats enough info to help most & to get the rest into trouble ,,,, after all these are simple engines and playing with them and knowing them will go a long way to helping them.....after all thay were mass produced & everything was left short & loose just for that reason ( which doesn't mean we cant clean some of that up )

For the ppl who think everything was designed and built as close to perfect as possible when produced ....Disregard this post your mindset can't be changed lol
01-28-2011 05:40 PM
MacGyverRI How did you make out? Is it running?
01-19-2011 12:46 PM
QuickMick thanks Mac, i think you maybe right, as we switched back to the old condenser and points which were creating hella fire...however we used the old rotor but new cap. i bet you are right on that rotor/cap tolerance being off. heck, now those points are set perfectly im gonna drop the old cap on. i bet the problem was a combo/points off and the weak coil referenced above. thanks for the tip, ill tell you how it works out.
01-19-2011 11:17 AM
MacGyverRI 1st, the plugs need to be grounded via the hex or threads and then you should see a tiny "blue" spark at the electrode. Personally, I like to hold it and jump j/k

2nd, the points will show a spark as they complete the circuit (goes to ground) and energizes (fires) the coil (primary coils) so it sparks (secondary coils), but that spark (points) isn't the spark you see at the plugs.

If the coil wire is sparking when it's close to a ground (needs an air gap/space) and is in fact firing when it's turning over, then the cap/rotor distance is usually too far apart. Matching a cap/rotor brand is very important.

A bad condenser can also cause this problem if it's a weak spark.

On top of all that, did you turn the distributor? (I hope not) That would also cause it not to fire properly. If that's the case, line up the timing mark on the front pulley/dampener w/ #1 (usually) on firing position and see if the rotor is pointing at that plug wire position. (just needs to be close)
01-19-2011 10:52 AM
QuickMick after messing with the points the grounding problem has stopped.....

but....

ive got plenty of fire in the cap, but i have no idea why between the cap and the plugs there remains a problem, as i cant get the plugs to spark?!? now the moyer marine manual suggests w/no plugs attached getting the coil wire to spark, i dont understand why this would be any diff. than the plugs. i have new wires and plugs, and again plenty of fire at the point... im confused
01-18-2011 02:14 PM
tommays You need to follow the power with a meter when its NOT working as it could be anyplace starting with the start switch NOT supplying power
01-18-2011 01:38 PM
QuickMick i think the point wires may not be clear, the replacement set didnt have that extra nut as the original, so i had to fiddle with the original and think that may be the problem, but am having trouble getting them right.
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