Is the Focus crankshaft pulley bolt right-hand or left-hand thread?
2 Answers
Focus crankshaft pulley bolt is right-hand thread. The crankshaft is subjected to combined forces including centrifugal force from rotating masses, periodically varying gas inertial forces, and reciprocating inertial forces, which impose bending and torsional loads on the crankshaft. Therefore, the crankshaft must have sufficient strength and stiffness, with journal surfaces requiring wear resistance, uniform operation, and good balance. To reduce crankshaft mass and the resulting centrifugal force during operation, crankshaft journals are often made hollow. Oil holes are drilled on each journal surface to allow oil intake or discharge for lubricating the journal surfaces. To minimize stress concentration, transition fillets are used at the connections between main journals, crankpins, and crank webs.
I've been repairing Ford Focus models for many years, and the crankshaft pulley bolts are mostly right-hand threads, meaning standard threads. This design ensures that the bolt naturally tightens during engine operation, preventing loosening. When replacing parts, use the right tools, such as a 22mm socket and a torque wrench, and tighten to the specified value as per the manual. Once, a customer tightened it the wrong way and ruined the threads, resulting in a complete pulley replacement at extra cost. So always confirm the direction before working—clockwise to tighten, counterclockwise to loosen—to avoid accidents. Regularly check the bolt's condition; if there's noise or vibration, inspect it immediately. Early intervention saves hassle and money.
