Timing system
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What is it?

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The term timing gear defines the set of mechanical components (camshaft, tappets, rods and rockers) that allow intake and exhaust valve opening and closure so that air, fuel and exhaust gases can pass through, based on the timing diagram.

The movement of the camshaft, usually fitted in the cylinder head or in a cylinder head extension secured to the cylinder head, is achieved by means of connection to the crankshaft via a rubber toothed belt or via a chain.

Toothed belt timingDiscover

Toothed beltDiscover

Chain timingDiscover

ChainDiscover

Did you know?

Timing kit

Timing kit

The coolant pump works actively in harmony with the timing components because it is driven by the toothed belt. The moving parts of the water pump, just like other components, suffer the same wear and tear over time. Therefore, it is not convenient to service the timing system and later on the water pump. When servicing the timing system, it is recommended that you replace all connected components at the same time as the timing belt, such as the tensioner bearings, the transmission roll and the water pump.

Service belt

Service belt

The service belt is connected to the timing belt, and controls the alternator and the climate
control compressor or the water pump, in the case that it is not controlled directly by the timing belt. The service belt should also be regularly checked and replaced according to the instructions in the owner handbook. If the service belt breaks, all of the aforementioned components will stop functioning, and there is a risk that the breakage may lead to fragments inside the pulley, causing serious problems for the timing system.

Belt or chain?

 Belt or chain?

Not all vehicles have a timing belt. Some models are fitted with a timing chain, which requires completely different servicing and maintenance procedures: the chain does not need to be replaced as often as systems with belts.

Fiat Professional’s tips

The timing belt runs on a series of fixed and mobile bearings, and also passes through the toothed pulley of the water pump: it is used continuously and undergoes severe mechanical stresses at very high engine compartment temperatures. If it breaks, this may cause serious, and sometimes irreparable, damage.

It is crucial to pay close attention to the mileages and time periods set out in the owner handbook for your car, in order to avoid accidental breakage of the belt with the engine running, which could cause serious and significant engine damage: bent valves, tilted rods, holes in pistons, etc.

Timing system maintenance is very delicate and must always be carried out:

  • Within the time periods set out in the owner handbook
  • By highly qualified professionals

When replacing the timing system during a service, it is recommended that you replace all connected components at the same time as the timing belt, such as the tensioner bearings, transmission roll and, where present, the water pump, which is an active component that works alongside the timing system components.

For the scheduled servicing of your vehicle, ask for the Mopar® timing kit: a complete solution containing the timing belt plus all the related components, including the water pump.

The timing kit guarantees the most accurate and convenient servicing possible. The Fiat Professional's Service Network's highly specialised personnel will be able to recommend the best repair solution for your needs.

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