MAHLE S42221 PISTON RING SET (STD) FOR 89-02 CUMMINS 5.9L

Product Description

Restore factory sealing and oil control with the MAHLE S42221 piston ring set for 1989–2002 5.9L Cummins (12-valve & 24-valve). This standard-bore ring pack is engineered to OE geometry and materials for long service life under work-truck heat cycles and towing loads.

Mahle S42221 piston rings standard bore, Cummins 5.9L 6BT ISB ring set, 1989–2002 Ram 2500 Ram 3500 diesel rings, chrome top ring Duramax-style wear resistance, CPP Diesel Mahle S42221 cross-reference S42170, single-cylinder ring pack order six, 4.016 inch 102.0 mm bore, low oil consumption fast seat-in plateau hone

Fitment

• 1989–1993 Dodge Ram 2500/3500 – 5.9L Cummins 12-valve (6BT, standard bore)
• 1994–1998 Dodge Ram 2500/3500 – 5.9L Cummins 12-valve (6BT, standard bore)
• 1998.5–2002 Dodge Ram 2500/3500 – 5.9L Cummins 24-valve (ISB, standard bore)

Cross-Reference / Alternatives (Mahle on CPP Diesel only)

• MAHLE S42221.020 (.020)
• MAHLE S42170 (STD) – 89–07 coverage
• MAHLE S42170.040 (.040)

Notes

Sold per cylinder (one piston). Order six (6) sets for a complete engine. Always verify bore size, hone finish, and file-fit ring end gaps to spec.

FAQ

Is this a full engine set or per cylinder?

Per cylinder. For a full 5.9L you’ll need six ring packs.

Will S42221 fit both 12V and 24V 5.9L Cummins?

Yes—S42221 covers 1989–1998 12-valve and 1998.5–2002 24-valve engines with standard (4.016"/102.0 mm) bores.

What materials are used?

Premium chrome-faced top ring with cast-iron second and 3-piece oil ring—built for OE-grade durability.

Specifications for Mahle S42221