<VV> Choke Coil VS Pull Off - was ambient

[William Hubbell]

JR got most of it right, however, the choke pull-offs work independently of the thermostatic coil, and it works at start-up to break open the choke. 

Bill Hubbell

On Jan 16, 2011, at 4:29 PM, "J R Read" <hmlinc at sbcglobal.net> wrote:

> Lonzo has it right.
> 
> The coil (when cold (cool?)) allows the choke plate to close.  Normally, 
> before turning the key to start position, the operator gently pushes the 
> skinny pedal to the floor and gently releases.  This "sets" the choke to 
> closed (or nearly so) position and the coil is tightly wound at that time. 
> There is an adjustable rod through the head connecting the coil to the carb. 
> As the coil warms it expands and allows the pull off to do it's job.
> 
> The pull off is controlled by vacuum.  They do go bad and can be tested 
> easily by pushing the metal tab on the back in and then covering the plastic 
> hose connector with your finger and releasing the metal tab.  If it comes 
> back out, the diaphragm inside is NG and the pull off needs to be replaced.
> 
> Adjustments are in the LM Chassis manual at 6M-6 and 7.  I did not look up 
> the page number in the EM manual, but they are there too.
> 
> Picture attached below.
> 
> Later, JR
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