Skateboard Bearings Buying Guide Skateboard bearings come in sets of eight and two are needed to allow each wheel to spin on the axle of a truck.

Timing chains largely replaced gear-driven timing systems, because they were lighter and more efficient, and then through the 1970s and 1980s they were themselves replaced in many instances by toothed timing belts, which required no lubrication where a timing chain does.

A worn timing chain will also emit a rattling noise. Timing belts tend to simply snap, which can cause huge internal engine damage in an instant, as valves open at the wrong moment and hit the top of the rising piston.

At the bottom end of the engine, the timing chain is also attached to the crankshaft, which rotates and raises and lowers the pistons at the perfect time to compress the fuel and air prior to ignition.

An engine’s timing chain keeps the movement of the components in the top half of an engine in synchronisation with those in the bottom half.

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As the camshaft spins, these lobes open and close the valves in the cylinder head to let fuel and air into the combustion chamber at the right time.

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However, the timing chain has come back to prevalence over the past couple of decades because of its greater robustness and longer life expectancy.

Timing chains also tend to give much more warning before they fail. They stretch slightly over the course of time, which can cause the engine to run poorly or even backfire, which is a good sign to get the chain replaced imminently.

In the top part of the engine, the timing chain is attached to the end of the camshaft, which has numerous lobes along its length.

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