Timing drive
The timing belt synchronizes the camshaft and crankshaft so the valves open and close in time with the pistons. Precise tooth engagement keeps engine timing accurate.
How automotive belts work, where they're used, and how to keep them running reliably — a practical guide for distributors and workshops.
Every modern vehicle relies on belts to move power around the engine bay. They handle two main jobs:
The timing belt synchronizes the camshaft and crankshaft so the valves open and close in time with the pistons. Precise tooth engagement keeps engine timing accurate.
Ribbed (PK) and V-belts drive the engine's accessories — alternator, water pump, power-steering pump and air-conditioning compressor — transferring power smoothly and quietly.
A few simple habits keep a belt drive reliable and prevent unexpected failures.
Check regularly for cracks, fraying, glazing, missing ribs or teeth, and oil contamination. Watch for misalignment and listen for squeal or chirp.
Keep belts and pulleys free of dirt, debris and oil. Contamination speeds up wear and causes slip.
Set tension to specification. Too loose causes slip and heat; too tight overloads bearings and cords.
Replace worn or damaged belts — and the tensioner and idlers with them — before they fail. Follow the vehicle's service interval.
Follow the vehicle manufacturer's interval. As a guide, accessory belts are often inspected from around 60,000 km, and timing belts are replaced on a fixed schedule — always confirm the figure for the specific engine.
Yes. Use our cross-reference to convert a Gates, Continental, Dayco, Bando or Optibelt code to the matching EGP part, then confirm pitch, width and length before ordering.
A timing belt has teeth and synchronizes the valve train; a ribbed (PK) belt uses lengthwise ribs to drive accessories by friction. They are not interchangeable.
Yes — a worn tensioner or idler shortens the life of a new belt. Replacing them together is best practice, which is why timing kits bundle them.
Belt sizing is defined by profile, width and length — not by vehicle. A single size can suit many engines, so always verify the dimensions against the OE catalog before ordering.