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550 Help

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Chris

07-13-1999 05:02:26




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I was called to look at a 550 that quit running. He said that it always had a miss at start-up but, would clear up as it warmed up, but it always ran a little rough.One day he was driving along, it sputtered and died and he has'nt got it to start since. Over the last year he has replaced most all of the ignition parts with no luck. I am not a pro mechanic, but I know enough to troubleshoot most things, but this one baffles me. The coil sends lots of spark all the way to the plug, pionts are working properly, #1 TDC coincides with #1 on the distributor, plenty of gas, still does not run. Well I looked at our S55 before I left and I noticed the #1 wire on the dist cap was on left next to the block. His was on left away from block. So I started turning the dist one way and the other. Where the dist was positioned origionally it would backfire trough the carb slightly and really blow fire the further I turned it. I turn it the opposite way and it would pop slightly out the exhaust and popped harder the futher it was turned also. I gave up for the night. Everything checks out for it to run but, it dont. Am I missing somthing? All the cylinders have 100 psi compression, so that seems ok. THANKS for ANY ideas.

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Len

07-13-1999 07:39:27




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 Re: 550 Help in reply to Chris, 07-13-1999 05:02:26  

Have you tried switching wires 1&3 and 4&2, or verified that 1 is firing on compression stroke instead of the intake stroke? Sounds like in the replacing components the wires have been reversed.



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Chris

07-13-1999 10:24:12




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 Re: Re: 550 Help in reply to Len, 07-13-1999 07:39:27  
I switched wires one position each direction and the one time it blew the muffler right off the manifold so i didnt go the next position that was the only thing I didnt try. But I confirmed TDC #1 with the mark on the flywheel and the rotor pointed at #1 plug wire. Is there a TDC mark for intake and compression? If so, now that I think about it, it would make sense that as it sat, it would fire on TDC intake and nothing would happen. One position either way it would backfire through carb or exhaust. It was late and the guy had to leave. I was hoping it would be something so simple I wasnt seeing it. Thanks for pionting that out to me. I'll give it another try and see what happens.

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Len

07-13-1999 13:13:19




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 Re: Re: Re: 550 Help in reply to Chris , 07-13-1999 10:24:12  
A 4-stroke engine fires every other revolution so at TDC it alternatively is either starting an intake stroke or a power stroke. The easiest way to verify is pull the sparkplug and stick your thumb in the hole an see if it's coming up on compression.



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Len

07-14-1999 07:52:20




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 Re: Re: Re: Re: 550 Help in reply to Len, 07-13-1999 13:13:19  
My explanation probably would have made more sense if I'd also pointed out that it takes 2 revolutions of the crankshaft to get one revolution of the distributor.



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