Gaffers And Sattler Furnace Blower Motor

I have a very old furnace.
Gaffers and sattler furnace blower motor. Might you read more. I let it run for a while then back off on the valve. Gaffers and sattler from 1962. I can t get the pilot light to stay lit.
I called a tech. So i figure i should replace the blower motor or the blower assembly. The blower is making a lot of metal on metal scraping sounds. 365 days to return any part.
I crank it over hear the hiss hold it there and light the pilot light. This model has a valve you turn hard counterclockwise to turn on the gas to the pilot light. I have a gaffers and sattler forced air gas furnace model 100 fef. Might you read more.
He also said that the blower motor is bad due to the dirty coil. Gaffers and sattler from 1962. I have a very old furnace. Who said that the evaporator coil was 100 clogged and that it needed cleaning.
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