[AT] Kinda Antique Tractor Question

[craig.warner47346 at frontier.com]

I don’t know a whole lot about the engine... not sure if it’s OHV or not.


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On Friday, November 29, 2019, 8:17 PM, Phil Auten <pga2 at basicisp.net> wrote:

 
The first thing that comes to mind is the piston contacting the ground terminal of the plug. But if that were the case there would be noise, I would think, and the starting would revert to terrible quickly. Perhaps there is a piece of carbon floating around inside the cylinder that occasionally gets pinched between the piston and  the plug? I just can't visualize anything else. If the head isn't to difficult to get to you might pull it and check for something like that. Is that a flathead or an OHV engine?
 
Phil in TX
 
 
 On 11/29/2019 6:11 PM, craig.warner47346 at frontier.com wrote:
  
 
 I’ve got a question that’s kinda antique tractor related (depending on how you define antique.) I have a 1992 Ingersoll 6018 with an Onan 16hp motor. It usually starts and runs great. Last few weeks it’s been terrible to start but then runs fine. I pulled the plugs today and the gap was close to nothing in both of them. Opened the gap to.030 and it fired right up. Why would the plug gap close? I had issues with them this spring and set it at that point. 
  Thanks, 
  Craig 
  
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