Monitor 15 severe yellow flame

As you can see in the photos, this Monitor #15 2-pint burns with a severe yellow flame.

I have gone over the stove multiple times searching for air leaks.

The jet was replaced.

Serviced and tested the NRV and safety valve for air leaks

The burner washers/seals were replaced.

I viewed the burner tubes with the aid of a magnifying glass.

No cracks were found.

When I remove the burner and blow through it, there is good air flow.

When I heated, and then forced compressed air through the burner tubes no carbon came out.

I removed the burner and mounted it on to a well-known 2-pint stove with the same results.

I tried shutting the stove off and relighting it at low pressure, and it flooded.

Looking for suggestions of things that I may have missed.

David L

 

Does this require a inner burner cap like other silents?
Duane

 

Yes, it uses the standard inner burner cap

 

Maybe a hairline crack that only shows up when hot.

What happens if you lift the outer cap one mm when running with either pliers or two screwdriver blades?

Can we see a photo please of the inner cap and the outer burner cap?

Is it yellow right from the start?

What size is the orifice?

 

Hello,
on the first picture it looks, if it's short before burning blue, the second one, looks to cold or a jet with a to big hole.

Try to heat one cup more, and get a (old not using)pot on the stands to reflecting the heat.

Have a nice weekend.

RJ

 

Some inner and outer caps just don't work with each other, or a particular burner. It is often more magic than science.

 

It amazes me about how much testing was done so many years ago, figuring out the design not only of these stoves, but cap configurations.
Duane

 

One other thing to try:

Put you inner and outer caps on a hard, flat surface and check that they sit evenly with no gaps above the surface.

If there are any, carefully make the bottom of the caps even by rotating the caps on fine emery paper.

I recently fitted a NOS Companion outer cap to a stove and it ran yellow on one side: there were slight dags of metal on the bottom edge of the outer cap from manufacture that passed quality control. I cleaned it up with 800 grit emery paper and it worked fine.

Also…

Is the nipple fitted properly and firmly?


Tony