Product Description
MAHLE 930036455 is an MS cast aluminum piston & ring kit (set of 6) engineered for the 1989–1998 Cummins 5.9L 12-valve (6BT). This kit uses MAHLE’s M124 cast alloy with Grafal skirt coating and ships with rings and full-floating pins for a ready-to-assemble solution.
- Bore: 4.055" (+0.040" over) • Stroke: 4.724" • Rod length: 7.559" • Compression height: 2.817"
- Pin: 1.575" dia., floating, pins & clips included
- Crown volume: -54.8 cc (dish) • Approx. compression ratio: 15.1:1
- Rings included: 3.0 mm / 2.4 mm / 4.0 mm set
- Material & features: Cast M124 alloy, Grafal skirt coating; MAHLE diesel piston design for durability under high thermal/mechanical load
Fitment
- 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 Dodge Ram 2500 / 3500 with 5.9L Cummins 12-valve (6BT)—+0.040" overbore applications.
Cross Reference / Related Items
- MAHLE 930036455-1 – single replacement piston for this kit (bare piston).
- MAHLE 930036455T – variant kit listing (same dish volume/pin size; check contents).
- Comparable MAHLE cast Cummins 5.9 kits shown by distributors for similar spec families (e.g., 197952455 series) — verify exact chamber volume before substitution.
What’s Included
- Six (6) cast aluminum pistons (dish, -54.8 cc), six pins, pin clips
- Complete ring pack for all cylinders (3.0/2.4/4.0 mm)
FAQ
Will these fit my stock 5.9L 12-valve?
Yes—this kit is for 1989–1998 12-valve Cummins engines that are machined +0.040" over (4.055" bore). Always measure and hone to spec.
Do the pistons come with rings and pins?
Yes, the kit includes rings, full-floating pins, and clips.
What compression ratio should I expect?
With a -54.8 cc dish and typical 12V build specs, expect roughly ~15.1:1. Actual CR varies with deck height, gasket thickness, and chamber volume.
Are these forged?
No—this is a cast M124 alloy diesel piston set designed for durability and OE-style reliability.
