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S14D engine not running - has spark


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#1 firedudetl1 OFFLINE  

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Posted December 05, 2016 - 05:52 PM

I have a 1477 Bolens with a S14D Wisconsin with a FEL - I had the engine rebuilt a few years ago and while there has been a recurrent problem with the compression release, once it started it would run well 

Friend of mine has it, was running it and it stopped - it appeared to have a weak spark and we weren't sure it the coil was good (had some funny resistance readings), so I bought a new coil, coil wire, plug and bracket - still has spark but won't run 

 

It does have the solid state ignition module 

any thoughts?

thanks



#2 boyscout862 ONLINE  

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Posted December 05, 2016 - 07:06 PM

It takes compression, fuel, and spark for an engine to run. If you have spark, then check the others. You can download the manual and use the troubleshooting guide. It will take you step by step through diagnosing the problem. Good Luck, Rick

#3 firedudetl1 OFFLINE  

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Posted December 05, 2016 - 08:22 PM

good with the compression, spark and fuel - my quick thought is timing, but I believe the timing is "fixed"  - my concern is somehow the timing is off



#4 nyrobbie77 OFFLINE  

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Posted December 06, 2016 - 09:41 AM

will it start and run on starting fluid?



#5 firedudetl1 OFFLINE  

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Posted December 06, 2016 - 09:12 PM

buddy who has it tried some acetylene and I think it "coughed" but didn't run



#6 Bruce Dorsi ONLINE  

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Posted December 06, 2016 - 09:50 PM

Valve timing ?

 

Valve clearances?

 

Vacuum leak ?


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#7 firedudetl1 OFFLINE  

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Posted December 06, 2016 - 11:40 PM

he's checked the valve clearances so that's out - how do you check the valve timing? thought the timing was "fixed" - what vacuum is there to leak?

thanks



#8 Bruce Dorsi ONLINE  

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Posted December 07, 2016 - 05:58 PM

he's checked the valve clearances so that's out - how do you check the valve timing? thought the timing was "fixed" - what vacuum is there to leak?

thanks

 

Valve timing is fixed by cam gear to crank gear relationship.  ....Normally that will only be wrong if someone assembles the engine incorrectly.

 

Broken teeth from the cam gear will also affect valve timing, as will a broken camshaft.

 

You mentioned recurrent problems with compression release --- If not working properly, this will affect valve timing.

 

Vacuum leak can occur at carb to manifold connection or manifold to block connection, or head gasket.

 

Hold your hand over the carb inlet while cranking (throttle & choke wide open).  ....Do you feel a strong suction?

 

When trying to start the engine, is the sparkplug wet or dry, after cranking? 



#9 stiemmy OFFLINE  

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Posted December 07, 2016 - 07:38 PM

good with the compression, spark and fuel - my quick thought is timing, but I believe the timing is "fixed" - my concern is somehow the timing is off

Did you run a compression test? If so, what were the numbers?

Is the spark nice and "blue" in color consistently?

Edited by stiemmy, December 07, 2016 - 07:42 PM.


#10 firedudetl1 OFFLINE  

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Posted December 08, 2016 - 09:19 PM

unfortunately, while I own it, the machine is with a friend of mine as he needed it and has more "room" than me for "stuff" - he just left for vacation so nothing will be getting checked until he gets back - I will keep this available as things to check when he's back - any more ideas will be welcome

thanks to all 






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