Halogen Oven

I have a couple of these ovens where the heating element has blown. Stripping stops where I try to remove the fan impeller, it seems that a special tool is required to remove the drive shaft nut, The drive shaft is about 6mm threaded and has a flat milled on the side. Can anyone suggest how can I remove the nut without spoiling the threaded shaft.

I don't know about a special tool but it may well be a left hand thread.

Peter

In a similar situation I made a two part tool to clamp round the D shape shaft from, I think, aluminium alloy bar giving something to hold to stop things rotating whilst the nut was undone.

Basically I drilled a hole close to one edge of a suitable length of bar and milled off the edge until the hole was reduced to a D shape of the correct depth. I suspect I had to work on the edges to make it U shaped so it could pass around the shaft. I then drilled and tapped two holes, one each side of the recess, to clamp a second short piece of bar across the flat holding the shaft securely whilst undoing the nut with a suitable spanner.

Hardest part was probably scheming things out so the tool could be fitted in the space availiable.

Overkill engineering really but going direct to something that would work is frequently faster than escalating improvisations.

Where there is sufficient space a Mole or similar self locking plier with wooden protectors on the jaws can work well. Some creativity with a similar protector on one side of a self locking adjustable spanner, recently discussed, might also be promising.

Clive

Every one I have fixed has been left hand thread.

Are you absolutely sure it is the element?

Maybe 4 out of 5 that I have fixed, it has been the thermal fuse that has gone.

Check it with a continuity meter and if it is open circuit, temporarily bypass it and see if the element comes on.

Thanks all. I will try the Mole grips tomorrow to see if it works. Sure that the element is dud since it is burned black and distorted

I’ve changed two bulbs. The replacements seem to have been better than the originals - at least lasted longer.