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Timing Belts

In the internal combustion engine application, the timing belt connects the crankshaft to the camshaft(s), which in turn controls the opening and closing of the engine's valves. A four-stroke engine requires that the valves open and close once every other turn of the crankshaft. The timing belt does this. It has custom teeth to turn the camshaft(s) synchronized with the crankshaft and is specifically designed for a particular engine. In some engine designs, the timing belt may also be used to drive other engine components such as the water pump and oil pump.

 

 

 

Timing belts are typically inaccessible and difficult to inspect. Engine manufacturers recommend replacement at specific intervals. The manufacturer may also recommend the replacement of other parts, such as the water pump, when the timing belt is replaced because the additional cost to replace the water pump is negligible compared to the cost of accessing the timing belt. Failure of the timing belt will seize the engine and often leads to damage that is uneconomic to repair.

 

Interference Engines

Depending on the design of the engine, the piston and valve paths may "interfere" with one another and incorrect timing in their movements may result in the piston and valves colliding.

In interference designs, regular service is especially important as incorrect timing may result in the pistons and valves colliding and causing extensive engine damage and therefore costly repairs. The piston will likely bend the valves or if a piece of valve or piston is broken off within the cylinder, the broken piece may cause severe damage within the cylinder, often also affecting the crankshaft. Some manufacturers, such as Nissan, have switched back to timing chains for the majority of their engines because of the breakage problems associated with belts. However, in some newer engines, timing belts are designed to last the effective life of the engine.

 

 

Solution to a snapped belt

If your car should suffer a timing-belt failure, bring it directly to R.B. Lindley & Son.

Our process:

The first step we take is to check, before removing the cylinder head, to see if any damage is likely to have been caused.

In certain cases some engines have clearance and the pistons will not have caused damage to the valves.

However, if there are signs of damage, the cylinder head will be removed from the engine block by one of our experienced engine repairers and then passed on to our machine shop for the damage to be repaired.

Common timing belt problems include bent valves or valve guides, or in extreme cases we see broken camshafts.

Once the cylinder head has been overhauled and refaced, it is then ready to be re-fitted to the block assembly – making sure at all times that all relevant technical information is adhered to.

In addition, a new timing belt or full timing belt kit will often need to be fitted.

 

0115 9790818

 

 

 

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R B Lindley & Son

55 Church Street

Old Basford

Nottingham

Nottinghamshire

NG6 0GA

Tel - 0115 9790818

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