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How to remove an overhead camshaft

On some overhead camshaft (OHC) engines. the camshaft must be removed to take off the cylinder head (See How to remove a cylinder head). On any OHC engine the camshaft is removed to gain access to the valves. Read more

Adjusting a camshaft timing belt

The tension of the toothed belt that drives an overhead camshaft must be checked at the intervals set by the servicing routine laid down in the car handbook. Check it also whenever you remove and refit the belt or the cylinder head. Read more

The engine - how the valves open and close

The valve which allows mixture into the cylinder is the inlet valve; the one through which the spent gases escape is the exhaust valve. They are designed to open and close at precise moments, to allow the engine to run efficiently at all speeds. Read more

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