"how do i check the parts in distributor?"
electrically?
by ohms checking them. you have an external coil (primary& secondary fields), "in distributor" pickup coil, and an ignitior (either external or on the fire wall). all should be ohms tested.
then there's the vacuum advance and fly weights that can be physically checked.
if you state the vehicle and engine, i can provide that info, or supply you with a link to a manual.
need to know what motor you have.
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FYI,
most distributors can be rebuilt. completely! *some* ASIN distributors can not be *completely* rebuilt. if the air gap exceeds 0.20-0.40mm between the pu coil and the signal rotor, it's toast.
however, your air gap *maybe* adjustable.
much cheaper to replace Internal items than to replace an ASIN distributor. coils, and ignitors are only 20 bucks or so. distributors are hundreds.
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