How to Inspect Timing Belts and Timing Pulleys?

[OHaley]

When inspecting timing pulleys, you can use calipers to measure the pulley diameter and check for wear. Below is relevant information about timing belts and pulleys: 1. The common issue with timing pulleys is wear. During inspection, use calipers to measure the pulley diameter and check for wear. If the pulley diameter exceeds the allowable limit, the timing pulley should be replaced. The manufacturer's recommended lifespan for timing belts is generally 32,000-96,000 km. If damage is found during inspection, the belt must be replaced. 2. Timing belts come in two types: single-sided teeth and double-sided teeth, referred to as single-sided belts and double-sided belts. Double-sided belts are further divided into symmetrical tooth type (DA) and staggered tooth type (DB). Timing belt teeth are categorized into trapezoidal tooth timing belts and arc-shaped tooth timing belts. Timing belt models are classified into seven types: lightest MXL, ultra-light XXL, extra-light XL, light L, heavy H, extra-heavy XH, and ultra-heavy XXH. 3. Timing pulleys are typically made from materials such as steel, aluminum alloy, cast iron, and brass. Their inner holes can be round, D-shaped, or tapered. Timing belt transmission consists of a closed-loop rubber belt with evenly spaced teeth on its inner surface and corresponding pulleys.