MAHLE S42170.020 PISTON RING SET (.020) FOR 89-07 CUMMINS 5.9

Product Description

MAHLE S42170.020 (.020" over) piston ring set restores compression, reduces blow-by, and controls oil on rebuilt 5.9L Cummins engines after a +0.020" overbore—engineered to OE geometry and materials for long service life in work trucks, tow rigs, and daily drivers.

MAHLE S42170.020 piston ring set, Cummins 5.9L 1989-2007, +0.020 overbore rings, diesel rebuild parts, OE replacement ring pack, chrome-faced compression ring, single-cylinder ring set, Ram 2500 3500 5.9 ISB 12V 24V

Fitment

• 1989–1993 Dodge D/W 250/350 5.9L Cummins (6BT)
• 1994–1998 Ram 2500/3500 5.9L Cummins (12-valve)
• 1998.5–2002 Ram 2500/3500 5.9L Cummins (24-valve VP44)
• 2003–2007 Ram 2500/3500 5.9L Cummins (24-valve Common Rail)
• Use only with cylinders machined to +0.020" over; finished bore approx. 4.035".

Cross-Reference / Alternatives (Mahle only)

• MAHLE S42170 (Standard Bore) – 1989–2007 5.9L Cummins
• MAHLE S42170.040 (+0.040") – 1989–2007 5.9L Cummins
• MAHLE S42221.020 (+0.020") – 1989–2002 5.9L Cummins (alt family)
• MAHLE 223-3717 Piston Pin Bushing – 5.9L Cummins

What’s Included

• Single-cylinder ring pack (.020" over): top ring, second ring, oil control assembly
• Order quantity 6 for a complete engine

Install Notes

• Confirm finished bore and hone spec (+0.020") before installation
• File-fit end gaps to Cummins/Mahle spec; orient ring gaps per service manual
• Use the correct 4.035" ring compressor; verify ring groove cleanliness

FAQ

Is this a full engine set?

No—this is a single-cylinder ring set. Order six for all pistons.

Will S42170.020 fit every 5.9L year from 1989–2007?

Yes, across 12V and 24V 5.9L variants when the cylinder is bored +0.020". Always match to the piston/bore size.

What’s the bore size for +0.020"?

Finished bore is approximately 4.035" (+0.020" over standard 4.016").

What’s the UPC/GTIN for S42170.020?

UPC/GTIN-12: 027067878328.

Specifications for Mahle S42170.020