b & s 16hp 303447

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Old 06-20-12, 12:46 PM
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b & s 16hp 303447

Have this engine on a 3 wheeled bunker rake.Have not rebuilt any of these yet.This engine broke a connecting rod,so I replaced that piston,rings,gaskets.Now the engine will not run seems like it is out of time. When I put back together is it possible something is out of sync?Also when I put the wire across the magnetos one cylinder will not fire ,,thanks
 
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Old 06-20-12, 03:36 PM
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Hello joeee,


When you re-installed the cam did you align the timing marks ?





On the no spark on one coil with the kill lead hooked up, There's two diodes in the kill lead harness. If one of the diodes has failed it will cause a no spark issue, A new kill lead harness would be in order to regain spark.....
 
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Old 06-20-12, 03:45 PM
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did not check the timing marks.the wire going across I checked for continuity.put the piston in with just the back cover off,but the engine was rotated while working on it.thanks for the help.Glad its on the bench and not back in.
 
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Old 06-20-12, 05:23 PM
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joeee
the wire going across I checked for continuity.
A diode is like a one way valve, Just because you have continuity one way doesn't mean the diode is good. Test each leg one at a time reversing the test leads, You should have continuity one direction and not the other. If you have continuity in both directions replace the harness, That's the only thing that will kill spark on one coil if there's spark on both with it disconnected.....
 
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Old 06-20-12, 06:15 PM
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thanks will let you know how it goes..
 
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Old 06-24-12, 06:31 AM
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thanks for the help,timing was off,as the no spark ,changed the wire to coils with one from a running engine no spark on one cylinder.checked the through cover connecter that seems fine.
 
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Old 06-24-12, 07:16 AM
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That's the only thing that will kill spark on one coil if there's spark on both with it disconnected.....

joeee,

Is this kill lead you tried off the same model engine ? Some models have diodes and some don't. If you don't have spark on one side with the kill wire disconnected from both coils replace the non sparking coil.....
 
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Old 06-24-12, 06:29 PM
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from the same engine off another bunker rake,seems when unhooked off plastic going through the cover,I get spark back, changed the coil,and checked to make sure that wasn't grounding out,lose spark on the side near the cover through hole..thanks for your input joe
 
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Old 06-24-12, 06:44 PM
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joeee
checked the through cover connecter that seems fine.
Joe,

Did you test this connector for a short with your multimeter ?

Seems odd that it only drops spark on one coil when the wire is hooked to this connector.....
 
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Old 06-25-12, 01:46 PM
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Thumbs up

you were right on with everything,hairline crack in the plastic piece going through the cover did not show on a couple of tests,do not know why just one was shorting out,the timing is on now also and it's running strong.Really want to thank you for the help
 
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Old 06-25-12, 02:30 PM
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Cool Joe,

I was actually running out of ideas without seeing it myself.....
 
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