4L Model Range Obsolescence (January 24, 2010)

In November 2007, Cummins Turbo Technologies announced the intention to obsolete 4L product, due to:

• Falling sales over the past 10 years
• Increases in the cost of manufacturing low volume parts
• 4L tooling reaching the end of its lifespan.

All turbochargers in the following model ranges and associated parts are now obsolete: 4LE, 4LEK, 4LEV, 4LF, 4LFK, 4LFV, 4LG, 4LGK, 4LGV, 4LGZ, 4LHR.

As mentioned in previous communications, this Technical Bulletin indicates suggested replacements.

4L Replacement List

Turbochargers from the original list that do not have a replacement are shown in red.

Replacement Turbochargers

• Some new turbochargers replace the 4L’s without impact on installation so are ‘drop in’ replacements (others may need alterations to mating items)
• Modern aerodynamic design offers fuel economy benefits, potentially reducing operating costs
• Modern improved bearing design gives improved reliability and durability, offering longer turbo life
• Due to current products being more cost effective to produce many replacement turbochargers will offer a price reduction
• Current product has better availability thus reducing lead times; many will be ‘off the shelf’
• Due to improved performance, one HX part number may replace several 4L’s, resulting in less stock held to support customers.