What is the belt routing for the 4D25 engine?

2 Answers
Minnie
09/06/25 7:16am
First, use a wrench to loosen the generator's main shaft to facilitate subsequent belt installation. Pull out the generator's auxiliary pulley to make it easier to wind the belt. Wind the belt around the generator's main shaft. Connect the belt to the generator's two auxiliary pulleys. After installing the generator cover, the generator belt installation is complete.
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MacQuinn
09/18/25 6:55am
I've been in the auto repair industry for many years. Regarding the 4D25 engine belt routing, the standard path starts from the crankshaft pulley, goes around the alternator pulley, then to the water pump pulley, followed by the power steering pump pulley (if equipped), and finally loops back to the tensioner pulley for adjusting tightness. The whole process is like drawing a circle, ensuring each pulley is evenly covered by the belt. Remember during installation that the belt shouldn't be too loose or too tight - the standard tension is about 1cm of deflection when pressed with a finger. Incorrect routing may cause belt slippage, squeaking noises, or in severe cases, damage to the alternator or engine overheating, affecting overall performance. Regularly inspect the belt for wear and cracks, and replace immediately if any cracks are found - this significantly extends engine life and prevents roadside breakdowns. Always consult the vehicle manual or professional diagrams first. If replacing it yourself, remember to note the old belt's position for reference.
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