[AT] Kinda Antique Tractor Question

[Stephen Offiler]

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
> <https://overview.mail.yahoo.com/?.src=iOS>
>
> 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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