[AT] Kinda Antique Tractor Question

[Phil Auten]

You are correct, Stephen,

In the original message the engine was described as a 16HP and I assumed 
a single cylinder.

Phil in TX


On 11/30/2019 10:53 AM, Stephen Offiler wrote:
> 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 
> <mailto: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
>     <mailto: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 <mailto: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 <mailto: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
>         <mailto: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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