NO! never remove the acid caps! EVER!
only if it is a battery to something like an ATV or dirt bike you would take the acids caps off and only to refill the acid.
if it is a normal car battery just leave them on.
if you are talking about the (+) and (-) battery TERMINAL caps then on some vehicles you have to take them off so that the charger can come in contact with the battery posts.
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no way.
Con rod and big end bearing caps are line bored at the manufacturing stage. Replacing the caps in the original positions keeps the caps in line to the original machining. By mixing the caps, you could well run the risk of running the bearings inside the caps
You have rod bearing caps that hold the rods on the crankshaft. And you also have main bearing caps that hold the crankshaft in the engine block. NEUTZ.
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