How to remove bi-metallic coil cover on King40
- Thread starter Jerome P
- Start date
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Undo the 2 square drive screws that hold the cover to the stove. The center screw does not need to be taken out, that limits the flappers max travel. Make sure the flapper is in the closed position when reinstalling the cover. It’s a good time to lube the thermostat flapper pivot points and thermostat friction washer along the shaft while you have the cover off.
However, the air flap is not associated with a position on the thermostat.
The whole point is that the air flap half open depends on the temperature at the coil and the thermostat knob position ...
Do your exercise at room temp, get some positions marked, start the stove, and then the air flap will be much more closed with the knob set at the same position.
The point is to set the knob at a position that makes you comfortable and let the regulation mechanism do its thing by modulating how far the air flap closes or opens.
The whole point is that the air flap half open depends on the temperature at the coil and the thermostat knob position ...
Do your exercise at room temp, get some positions marked, start the stove, and then the air flap will be much more closed with the knob set at the same position.
The point is to set the knob at a position that makes you comfortable and let the regulation mechanism do its thing by modulating how far the air flap closes or opens.
I removed the 2 screws but unable to remove the cover trying lifting straight up and straight out. The air control is fully closed.
Just wondering, perhaps the position marking may be more accurate if the stove has been operating for 24 hours?
I was able to move the bottom edge of the plate outward about a 1/4" and able to move the cover downward about a 1/2" I must be missing something?
Even then, or moves during a burn; wood shifts, burn rate changes, heat output changes,.so the coil makes the flapper move to return it to its constant output rate.
There really is no use to mark flapper position on the knob.
It's fine o open it and have a look to see how it operates from start up to steady state tho.
There really is no use to mark flapper position on the knob.
It's fine o open it and have a look to see how it operates from start up to steady state tho.
Very curious on how the assembly looks and to see where I need to lubricate certain points in the future, if I'm able to remover the cover.
Here's a video that clearly shows how the cover is attached.
Just keep wiggling it. If that doesn't work try running a plastic knife between the cover and coil assembly housing to break it free. You could also use a metal putty knife, just repaint any scratches so it doesn't rust.
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Just keep wiggling it. If that doesn't work try running a plastic knife between the cover and coil assembly housing to break it free. You could also use a metal putty knife, just repaint any scratches so it doesn't rust.
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I got it off. I needed to use a flat head screwdriver and pry the top of the cover outward to clear the stove top air deflector.
I removed the cover and operated the thermostat control rod, I'm amazed how accurately the air flap responds with the slightest turn when fully closed, the same on the opposite end. BK done a good job at calibrating the air flap and thermostat.
Very small thermostat knob adjustments make a big difference in stove operation. You can just leave the cover off it you want. To watch what it does while burning.
Can you please clarify what you mean by fully closed? Do you mean the control knob is turned as far to the left as it can go and you have instant control to open the flap, or do you mean when when the flap is closed a slight move of the knob in the clockwise direction opens it?
I’m asking as the range of my flap from fully open to fully closed when looking at the control knob is flap fully open when the knob is turned completely to the right, and the flap is completely closed when the knob is at 2pm (where the white line starts on my PE-32). This is with a cold stove.
Thanks!
RDP
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When reinstalling the cover you need to be sure that the intake butterfly blade is closed, in the horizontal position, against its seat. Thermostat knob fully in the cold position which is counterclockwise, or left if you think of things as lefty loosy.
The reason for this is because the little stopper overtravel screw in the cover can actually be installed on the wrong side of the intake blade if it is set to wide open throttle. Then the blade cannot close and the stove would run away. You would almost have to intentionally do it wrong but we must remind you because the consequences are severe.
100% concur. Your warning is good to place here for anyone who might visit this thread but not have been privy to the saftey considerations disuccsed in other threads.
That being said...... on a cold stove, flap fully open (knob position set to wide open). My flap sits at almost a perfect 45 degrees angle in relation to the air intake. While I never measured it, I think unless I was intentional, or made some massive mistake that it would be in only a situation where I was able to physically increase the opening of the flap somehow (don't know would you do that when putting the cover back....) that to actually have the flap be obstructed by the saftey screw would be a freak outcome. I guess the Darwin Awards exists for a reason....
thanks,
RDP
All you have to do with the cover off is to flip the knob quickly to max and the throttle valve can swing farther than equilibrium and go over center and stay. Or of course you can put it there with your finger. It is possible to have that throttle blade on the wrong side of the safety stop, that's why the safety stop is there. It can happen.
If you're smart enough to locate a square drive to open that cover then you are smart enough to close the throttle blade before reinstalling the cover so long as you know to do so.
