The SPOOLOGIC Turbo Step Gap Oil Seal Kit SL-210-122 is a complete oil seal service pack for the factory HE351CW turbocharger on 2003-2007 5.9L Cummins applications. Includes new compressor-side and turbine-side step gap piston-ring style seal rings — the two most common oil-control failure points on this CHRA. Ships as a seal-only pack for shops and DIY builders who are servicing a turbo that has developed oil leaks past the shaft seals but still has serviceable bearings and rotating hardware. If bearings, shaft, or thrust hardware also need replacement, order the full SPOOLOGIC Turbo Rebuild Kit for this platform instead.

What’s Included

• 1 SPOOLOGIC turbo step gap oil seal kit — compressor-side and turbine-side step gap piston-ring seal rings

Features

• Compressor-side and turbine-side step gap piston-ring seal rings for the HE351CW CHRA
• Precision-ground seal rings sized for the factory CHRA
• Addresses blue smoke, oil in intake, oil in exhaust housing caused by worn shaft seals
• Built brand new, never remanufactured

Fits 2003-2007 5.9L Cummins

• 2003 – 2007 Dodge Ram 2500 / 3500 5.9L Cummins

Turbo Applications

• Services factory Holset HY35W on 2003-early 2004 5.9L Cummins trucks with mechanical wastegate
• Services factory Holset HE351CW on 2004.5-2007 5.9L Cummins trucks with electronic wastegate VGT
• Compatible with SPOOLOGIC SL-100-080 (2003-early 2004 HY35W stock replacement) and SL-100-081 (Stock Plus billet upgrade)
• Compatible with SPOOLOGIC SL-100-082 (2004.5-2007 HE351CW stock replacement) and SL-100-083 (Stock Plus billet upgrade)
• Compatible with SPOOLOGIC SL-100-084 (Stage 1 billet upgrade)

Replaces Factory OEM Part Numbers

• 3593075
• 3599810
• 3599811
• 4033667
• 4033667H
• R5086863AB
• 05143256AA
• 4036836
• 4036836H
• BD1045767

DIY Product — All Sales Final, No Warranty, No Returns

This SPOOLOGIC turbo step gap oil seal set is a professional DIY assembly product intended for experienced turbo builders and rebuild shops. Successful installation requires proper tools, OEM service procedures, cleanliness standards, correct CHRA disassembly and reassembly technique, and dynamic balancing of the completed rotating assembly on a VSR balancer before return to service. Because SPOOLOGIC has no control over installation quality, balancing accuracy, or the condition of the parts the kit is installed into, all sales are final — no warranty, no returns, no exchanges. By purchasing this kit you acknowledge that you are responsible for correct rebuild, balancing, and installation.