Single set of S42221 (.020 , .040) Piston Rings
Six Required for Full Piston Ring Replacement

The MAHLE S42221 Premium Piston Rings Set designed specifically to fit Cummins 5.9 engines manufactured between 1989 and 2004 (early). This high-quality piston ring set ensures optimal performance and reliability for your Cummins engine.

The MAHLE S42221 set includes three types of rings to cover the complete compression and oil control needs of your engine. The upper compression ring (UCR) is made of durable ductile iron with a ceramic chrome facing, providing excellent sealing and longevity. The lower compression ring (LCR) and oil control ring (OCR) are constructed with cast iron for reliable performance.

With an axial height of 3.00mm for UCR, 2.38mm for LCR, and 4.00mm for OCR, these rings are engineered to precise specifications for proper fit and function. The UCR utilizes the RFK-18U ring type, while the LCR is of BT-10 type, and the OCR features the GCL-40UAW type.

Trust the Clevite MAHLE S42221 Premium Piston Rings Set to enhance the performance and longevity of your Cummins 5.9 engine. Choose from the standard size or the .020 and .040 oversized options to meet your specific engine requirements. Upgrade your piston rings today for improved engine efficiency and reliability.

Clevite MAHLE S42221 Details

Cummins NOTES:

Material: UCR: Ductile Iron; LCR: Cast Iron; OCR: Cast Iron
Facing: UCR: Ceramic Chrome; LCR: N/A; OCR: N/A
Axial Height: UCR: 3.00mm; LCR: 2.38mm; OCR: 4.00mm
Ring Type: UCR: RFK-18U; LCR: BT-10; OCR: GCL-40UAW
UCR = Upper Compression Ring (Top Ring)
LCR = Lower Compression Ring (Second Ring)
OCR = Oil Control Ring (Bottom Ring)

Clevite MAHLE S42221.020 Details

Cummins NOTES:

Material: UCR: Ductile Iron; LCR: Cast Iron; OCR: Cast Iron
Facing: UCR: Ceramic Chrome; LCR: N/A; OCR: N/A
Axial Height: UCR: 3.00mm; LCR: 2.38mm; OCR: 4.00mm
Ring Type: UCR: RFK-18U; LCR: BT-10; OCR: GCL-40UAW
UCR = Upper Compression Ring (Top Ring)
LCR = Lower Compression Ring (Second Ring)
OCR = Oil Control Ring (Bottom Ring)

Clevite MAHLE S42221.040 Details

NOTES:

Material: UCR: Ductile Iron; LCR: Cast Iron; OCR: Cast Iron
Facing: UCR: Ceramic Chrome; LCR: N/A; OCR: N/A
Axial Height: UCR: 3.00mm; LCR: 2.38mm; OCR: 4.00mm
Ring Type: UCR: RFK-18U; LCR: BT-10; OCR: GCL-40UAW
UCR = Upper Compression Ring (Top Ring)
LCR = Lower Compression Ring (Second Ring)
OCR = Oil Control Ring (Bottom Ring)

Compatible With:

1989 Dodge 5.9L 12V Cummins
1990 Dodge 5.9L 12V Cummins
1991 Dodge 5.9L 12V Cummins
1992 Dodge 5.9L 12V Cummins
1993 Dodge 5.9L 12V Cummins
1994 Dodge 5.9L 12V Cummins
1995 Dodge 5.9L 12V Cummins
1996 Dodge 5.9L 12V Cummins
1997 Dodge 5.9L 12V Cummins
1998 Dodge 5.9L 12V Cummins
1998.5 Dodge 5.9L 24V Cummins
1999 Dodge 5.9L 24V Cummins
2000 Dodge 5.9L 24V Cummins
2001 Dodge 5.9L 24V Cummins
2002 Dodge 5.9L 24V Cummins
2003 Dodge 5.9L 24V Cummins
2004 (Early) Dodge 5.9L 24V Cummins

*May not work for all builds due to other engine/vehicle modifications

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MAHLE S42221 Premium Piston Rings Set Fits Cummins 5.9 1989-2004

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