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Trouble with Kohler CV15S Engine


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#1 kbm123 OFFLINE  

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Posted June 18, 2017 - 12:48 PM

I have a mid 1990s Craftsman lawn tractor with a Kohler CV15S engine. Background: 1) Had a small oil leak this spring. 2) Used tractor 2 times this year. First use while starting, it didn't start on first try and then sprayed fuel out of muffler. Then started and ran for 2 hours. Suspected fuel shut-off solenoid was bad. On second use after about 10 minutes, engine backfired and quiet. It would start but only ran at sub-idle speed regardless of throttle input.

Disassembled top half of engine, replaced carburator with new one. Replaced head gasket to fix oil leak and new carburator gaskets. Reassembled with new spark plug gaped to 0.040. Now engine does seem to fire at all. Checked fuse and interlock switches. Checked spark on engine block and check ignition module gap. Sprayed gas and and even starting fluids in carb. Still doesn't fire. I should also note that I can hear the engine intake pull air in when I turn engine. I am pretty sure the engine is getting fuel. Tested to carb and spark plug looks wet too. Noticed that valve lifters are non-adjustable type. However, it looks like the top valve, which I believe is the intake valve, is being depressed some even at its high point in the cycle. I suspect that the exhaust valve is also depressed some. I believe this is why it is not firing. Need help on what to do with this issue and what to do next.

#2 js5020 OFFLINE  

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Posted June 18, 2017 - 03:17 PM

I worked on one of these a few yrs back, crappy running, hard starting, back firing,,,,, short story the flywheel key was sheared and the flywheel spun enough to make it have issues but not a complete fail.



#3 Bolens 1000 OFFLINE  

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Posted June 18, 2017 - 03:29 PM

If your not getting any response with gasdown the plug hole the issue is something other than fuel.

 

Sounds like the valves need some work, also take a look at the push rods



#4 KennyP ONLINE  

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Posted June 18, 2017 - 03:35 PM

If your not getting any response with gasdown the plug hole the issue is something other than fuel.

 

Sounds like the valves need some work, also take a look at the push rods

I'd also inspect the flywheel key due to the backfire!


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#5 chieffan OFFLINE  

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Posted June 18, 2017 - 05:48 PM

Plug gap at .040 sounds awful wide to me.  .035 is max I would think?



#6 jms180 OFFLINE  

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Posted June 18, 2017 - 06:21 PM

are you saying no spark at plug or spark with no compression






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