What is included in timing belt package?
A timing belt package (timing belt kit) typically includes the belt itself plus the components needed to replace and tension it: a belt tensioner, one or more idler pulleys, and often a water pump; depending on the kit, you may also receive seals, gaskets, mounting hardware, and additional items such as a thermostat or serpentine belt.
Details matter because engines differ in how many pulleys they use, whether the water pump shares coolant passages with the belt drive, and what seals must be replaced to prevent leaks. Carmakers and aftermarket suppliers offer different configurations—some kits are “with water pump” and others are “pump not included.” Always verify the exact contents against your engine code and service manual before purchasing.
Common inclusions in timing belt kits
Below are the parts you will typically find bundled in a timing belt kit. Contents can vary by make, model, and kit type.
- Timing belt
- Tensioner pulley
- Idler pulleys (one or more, depending on engine)
- Water pump (included in many but not all kits)
- Seals (crankshaft seal, camshaft seals where applicable)
- Gasket set (timing cover gaskets and related seals)
- Mounting bolts and hardware
- Thermostat (included in some kits)
- Serpentine belt (sometimes included in “full” or combined kits)
Note that not every kit contains all of these items; some engines require separate replacement parts bought separately. Always check the kit’s contents against your vehicle’s requirements before purchase.
Kit types and how to choose
Manufacturers offer several kit configurations to suit different service needs and engine designs. The following are common options you will encounter when shopping for a timing belt package.
- Timing belt kit (belt, tensioner, and idlers only) — ideal when water pump does not need replacement or is serviced separately
- Timing belt kit with water pump — adds a new water pump to the standard belt/tensioner/idlers
- Full timing kit — belt, tensioner, idlers, water pump, seals and gasket set (comprehensive package)
- Engine service kit — may include thermostat, serpentine belt, and extra seals or coolant-related items
When choosing a kit, consider your engine’s requirements, whether the water pump is involved in the service interval, and your vehicle’s tolerance for separate purchases. If in doubt, consult a professional or reference the vehicle’s service manual.
How to verify contents for your vehicle
To ensure you purchase the correct timing belt package, take the following steps:
- Check your vehicle’s year, make, model, and engine code; confirm the kit is designed for that engine
- Read the kit’s contents list carefully and compare with the parts your mechanic has recommended
- Verify whether a water pump is included, if your service interval requires it
- Look for a warranty or guarantee on the kit and its components
Choosing the right kit helps ensure alignment and sealing are properly restored, reducing the risk of failure after installation.
Summary
Timing belt packages vary by engine and supplier, but most include the belt, tensioner, and idlers, with water pump, seals, and gasket sets included in many full kits. Optional items such as a thermostat and serpentine belt are available in some configurations. Always verify exact contents against your vehicle’s requirements and consider a full kit for a complete replacement to minimize future maintenance issues.
Does a water pump come with a timing belt kit?
Some kits are available with water pumps as the water pump can also be driven by the same timing belt. Because changing the timing belt can be an expensive job and changing the water pump separately would likely involve re-timing the engine it is often worth changing the pump at the same time.
What does the timing belt kit come with?
A timing belt kit typically includes the timing belt, a tensioner pulley, and one or more idler pulleys. Many kits also include the water pump and necessary gaskets and seals because it is often driven by the timing belt and is most efficient to replace at the same time.
This video shows the components included in a typical timing belt kit: 52sUnderhood ServiceYouTube · May 12, 2022
- Timing belt: The main toothed belt that synchronizes the engine's crankshaft and camshaft.
- Tensioner and idler pulleys: These ensure the belt maintains the correct tension and prevent it from slipping.
- Water pump: Often included as it's a critical component of the engine's cooling system, and its labor is often covered by the timing belt replacement.
- Gaskets and seals: New gaskets and seals are included with the water pump to ensure a leak-free seal.
- Fasteners: Some kits may also include the necessary bolts, screws, and other hardware to secure the components.
What does a timing belt consist of?
rubber
A timing belt is typically made from rubber, although some belts are instead made from polyurethane or neoprene. The structure of the belt is reinforced with corded fibres (acting as tension members) and the toothed surface is reinforced with a fabric covering.
What is included in timing belt service?
When having the timing belt replaced at a reputable service center, the service often includes replacing the tensioner and idler rollers. The technician will also inspect the crankshaft and camshaft seal, replacing them if necessary. It is also common for this service to include replacing the water pump as well.
