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Are all Fan Capacitors the Same?

Excuse the title but the issue I have is that all fan capacitors are not the same and I am running out of places to get answers. My mother-in-law lives in a Modular/Mobile home which still has the original Armstrong Electric Central Heating Unit from the 1970's. The unit sat unused for at least 20 years and recently she tried to start it up and with in a few minutes the fan capacitor burnt up. The model number the technician gave her for the capacitor was E66208 and I believe the heating unit is model number E1620D2C4. I have given this information to several companies and they are unable to pull anything up. My question is whether there is a common capacitor which would work in this situation. I obviously don't want to install the wrong one but so far the technician she is working with has not been able to provide any answers or a replacement part. I appreciate any input on the topic and welcome any questions that might help resolve this issue.
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Comments
I will get you more info in a minute
Retired HVAC Contractor from So. Jersey Shore.
Cleaned & services first oil heating system at age 16
Specialized in Oil Heat and Hydronics where the competition did Gas Warm Air
If you make an expensive repair and the same problem happens, What will you check next?
if yes then the capacitor has some important numbers.
The Microfarads and the Voltage. Microfarads can be abbreviated MFD or the lower case Greek letter Mu and letter f μf. You need to replace it with the same MFD and Voltage. the Voltage may be higher on the replacement but it can not be lower.
If it does not look like this or you cant read the numbers, we will need pictures of the fan motor, HP Voltage, RPM, and all the other n numbers on the nameplate of the motor.
Retired HVAC Contractor from So. Jersey Shore.
Cleaned & services first oil heating system at age 16
Specialized in Oil Heat and Hydronics where the competition did Gas Warm Air
If you make an expensive repair and the same problem happens, What will you check next?
I've never seen the information on the wiring schematic for the capacitor, but it would be great if the manufacturers put the information on there.
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
The nameplate on the motor should have the value of the cap on it. If not, I'd compare the HP and run current to a few other motors of similar power/amps & take a stab at it. Go with a 440V rated cap, those can substitute for the lower-rated-voltage ones, but not vice versa; & err on the larger (higher capacitance) side.
Good time to clean the blower wheel and inspect the elements.
@ratio, How old are you?
Retired HVAC Contractor from So. Jersey Shore.
Cleaned & services first oil heating system at age 16
Specialized in Oil Heat and Hydronics where the competition did Gas Warm Air
If you make an expensive repair and the same problem happens, What will you check next?
Retired HVAC Contractor from So. Jersey Shore.
Cleaned & services first oil heating system at age 16
Specialized in Oil Heat and Hydronics where the competition did Gas Warm Air
If you make an expensive repair and the same problem happens, What will you check next?
Retired HVAC Contractor from So. Jersey Shore.
Cleaned & services first oil heating system at age 16
Specialized in Oil Heat and Hydronics where the competition did Gas Warm Air
If you make an expensive repair and the same problem happens, What will you check next?
Ground's a lot further away now, too.