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Changing the gas valve in an Impco Model 425 mixer is extremely easy:
- Find a flat screwdriver and a sharp knife.
- Take the air cleaner lid off.
- Put the air cleaner wing nut in a safe place.
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- Carefully unscrew the 4 small screws holding the air valve diaphragm cover in place.
- Put the 4 small screws in a safe place.
- Put the air valve spring in a safe place.
- Check for wear in the gas outlet orifice.
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- Remove the old gas valve's diaphragm from its cover. The diaphragm's gasket may be stuck to the to the cover so you will need to very carefully separate the two with the sharp knife.
- Clean off any old gasket from the cover and the mixer body.
- Place the new gas valve in the mixer.
- Be careful to line up the holes in the diaphragm with the holes in the mixer.
- Place the air valve spring in the center hole of the new gas valve.
- Replace the air valve cover and insert the screws back into their holes.
- Gradually tighten all of the screws in an X-pattern so that the cover is uniformly torqued down.
- Do NOT tighten the screws more than finger-tight.
- Replace the air cleaner lid and wing nut.
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