[AT] Kinda Antique Tractor Question

deanvp deanvp at att.net
Fri Nov 29 21:58:49 PST 2019


Another thought. By chance did the compression rings on the plugs not get installed at the last service. That would change how far the plug penetrates the combustion chamber and might be just enough to cause an interference fit under certain conditions such as high RPM or higher engine temperatures.Sent from my Verizon, Samsung Galaxy Tablet
-------- Original message --------From: craig.warner47346 at frontier.com Date: 11/29/19  9:32 PM  (GMT-08:00) To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com> Subject: Re: [AT] Kinda Antique Tractor Question 
I don’t know a whole lot about the engine... not sure if it’s OHV or not.Sent from Frontier Yahoo Mail for iPhoneOn 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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