[AT] Kinda Antique Tractor Question

[Jim Becker]

My exact thought too.  It seems more likely that a set of projected tip plugs were installed where there isn’t enough room for them.

Jim Becker

From: Stephen Offiler 
Sent: Saturday, November 30, 2019 10:53 AM
To: Antique Tractor Email Discussion Group 
Subject: Re: [AT] Kinda Antique Tractor Question

The thing about the carbon hypothesis is that this is a twin, and it's happening on both cylinders, sounds like both affected equally.  Doesn't seem like a random chunk of carbon causing the issue would occur equally in both. 

SO
 

On Sat, Nov 30, 2019 at 11:37 AM deanvp <deanvp at att.net> wrote:

  It could be carbon floating around in the combustion chamber but also consider that when the engine warms up expansion might cause zero clearance between the ground side of the plug and the piston or valve. Check to see what are the recommended plugs vs what are currently installed.  Also consider high RPM might play a role as well. 



  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 iPhone


  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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