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
4L | Replacement |
|---|---|
| 54334 | 3580771 |
| 3503044 | 3530548 |
| 3503623 | 3534685 |
| 3503776 | No Replacement |
| 3504412 | 4032054 |
| 3504942 | 4027985 – on test |
| 3521595 | 4032333 |
| 3521598 | 4032333 |
| 3521971 | 4032312 |
| 3522293 | 4032333 |
| 3522346 | 4032794 |
| 3525088 | No Replacement |
| 3525143 | 4027786 |
| 3525150 | 4027786 |
| 3525153 | No Replacement |
| 3525178 | 4032312 |
| 3527192 | 3530548 |
| 3527751 | 4032199 |
| 3528320 | 4027071 |
| 3545741 | 4027787 |
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.
