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INA Bearings and engine components

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INA is another division of the Schaeffler Group and was founded in 1946. They supply Mercedes-Benz with a wide range of bearings pulleys and engine components. 

INA pioneered the Hydraulic variable cam timers that Mercedes-Benz introduced on the M104 engine in 1990. 

Pictured here is the casting mark on a drive belt pulley support for an OM611 engine.