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Replacing a 60 Mfd cap with a 55 Mfd cap is not recommended. The tolerance for run capacitors is +/- 5% so 55 is below that tolerance. It may work in an emergency or interim situation until you can get the proper size capacitor. If the run cap is definitely bad, there is a good chance your compressor is ok. That's not an absolute though.
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Capacitors don't necessarily have to be bulging to have failed. They can fail without bulging or they can get weak as well. If your compressor is not starting, it could be a weak capacitor or your compressor may be getting harder to start with age. The first step is to ensure the compressor is getting full voltage and there are no burnt wires or burnt contact points. The second step is capacitor check/replacement and then you can go further with the addition of a boosting capacitor typically called a 'hard start kit'. Your hvac guy will probably follow this procedure. The worst case scenario it that your compressor is seized up and there's nothing that can be done there except a compressor replacement.