How tight is bolt on engine pulley?

The tightness of a bolt on an engine pulley typically depends on the manufacturer's specifications, which can vary by engine type and design. Generally, it should be tightened to a specific torque value, often measured in foot-pounds or Newton-meters, to ensure proper function without risking damage. It's important to follow the recommended torque settings in the service manual to avoid over-tightening or under-tightening, which can lead to issues like slippage or failure. Always use a torque wrench for accuracy when tightening.