At the Cancun meeting of the world trade talks in September 2003, a powerful new grouping of developing countries emerged. Led by rapidly growing countries and major exporters like Brazil, China, India, and South Africa, this group has been powerful enough to challenge the EU and the US in trade negotiations.
Internal Mechanical Problems. 1  Internal mechanical problems can also cause engine knocking. One such problem stems from excessive clearance inside the bearings in the connecting rods that transfer the downward movement of the pistons to crankshaft rotation. Each time the piston changes direction, there is a knock from the metal hitting metal. This is often referred to as a rod knock. It is usually very rhythmicâit increases with engine speed and intensifies with engine load. Other mechanical problems that lead to engine knocking are: Defective main crankshaft bearings
Interference engines DO cause damage if the timing belt breaks. Non Interference or freewheeling engines usually will not cause the valve to hit the pistons if valve timing is incorrect. Ford escort is Not a interference engine. The valves will not hit the pistons if the timing belt breaks.