[TR] TR4 engine question

[Guy D. Huggins]

Sometimes hot spots can act as an artificial spark plug.  For example, if there is a sharp edge on a new exhaust valve.  It could get hot enough to ignite the fuel remaining in the system.

Kind Regards,

Guy D. Huggins

> On Feb 26, 2019, at 10:14 AM, Wbeech at flash.net <wbeech at flash.net> wrote:
> 
> Same problem here with the TR3 motor in the Morgan, but not the TR3.  I don’t see how ignition timing could affect it as it is turned off.  I used to hear it was due to carbon buildup continuing to ignite fuel, but that doesn’t fly for a fresh engine.  
> 
> I’m going to lean the mixture a little and see if that makes any difference.  Till then, Dave’s method of easing the clutch out seems to be the accepted workaround.  
> 
> Bill
> TS30800L
> 
> Sent from my DynaTAC 8000X
> 
> On Feb 26, 2019, at 8:46 AM, Andrew Uprichard <auprichard at uprichard.net> wrote:
> 
> Assuming everything else (timing, carburation) is set, do you have an electric fan?  My TR3 runs on if the fan is still on when I turn the ignition off.
>  
> Andrew Uprichard
> Jackson, Michigan
>  
> From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of DAVID MASSEY
> Sent: Tuesday, February 26, 2019 7:34 AM
> To: trguy75 at gmail.com; Triumphs at autox.team.net
> Subject: Re: [TR] TR4 engine question
>  
> First off, congratulations on your win.
>  
> Secondly, do what I do.  Put the car in fourth gear and let the clutch out as you switch off.  Be sure to set the brake first.  My TR6 diesels even with the anti-run-on valve.  So does the TR3.
>  
> Dave
> 
>  
>  
> -----Original Message-----
> From: Jim Henningsen <trguy75 at gmail.com>
> To: 'triumphs' <Triumphs at autox.team.net>
> Sent: Mon, Feb 25, 2019 9:41 pm
> Subject: [TR] TR4 engine question
> 
> Fresh TR4 engine that does that "dieseling" thing after you turn off the
> key.  It like it tries to keep running but with a cough and then stops.  The
> TR6 has an anti-run on valve to help with that.  What do I treat on a TR4
> motor?  P.S.  So proud that after 8 years putting my 4 back together stock,
> I won first place in the sports car group at the AACC winter national. 
> Thanks
> Jim Henningsen
> Ocala, FL
>  
> 61 TR3A
> 62 TR4
> 75 TR6
>  
>  
>  
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