MAHLE 930036455 MS CAST ALUMINUM PISTON SET (4.055IN BORE 4.724IN STROKE 7.559OD 1.575 PIN -54.8CC 15.1 CR) FOR 89-98 CUMMINS 5.9L 12V

Product Description

Refresh your 12-valve Cummins with the MAHLE 930036455 MS cast aluminum piston set. Engineered for 4.055" (+.040") overbore builds, this kit delivers OE-grade durability with M124 cast alloy pistons, Grafal® skirt coating, and a factory-matched 3.0/2.4/4.0 mm ring pack for reliable sealing under towing, work-truck, and performance heat loads.

Mahle 930036455 Cummins 5.9 12V pistons, 4.055 bore .040 over pistons, 7.559 rod 1.575 pin, -54.8cc dish 15.1:1 CR, Grafal coated skirts, diesel piston set with rings, CPP Diesel Mahle pistons, 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 Ram 2500 3500 6BT

Fitment

• 1989–1998 Dodge Ram 2500/3500 with 5.9L Cummins 12-valve (6BT) — requires machining to 4.055" (+.040") and proper hone finish.

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

• MAHLE 197952335 – Cast piston set (+.020, 4.035" bore)
• MAHLE S42170 – Standard-bore piston ring set (single-cyl.)
• MAHLE S42170.040 – .040" over piston ring set (single-cyl.)
• MAHLE CS4068 – Lower engine gasket set (12V)

What’s Included

• Six (6) cast aluminum pistons (-54.8 cc dish), six full-floating wrist pins (Ø 1.575") and clips
• Complete ring pack: 3.0 mm top / 2.4 mm second / 4.0 mm oil

Helpful Notes

Always measure, bore/hone with the correct plateau finish, and verify ring end-gap to MAHLE specs. Compression ratio varies with deck height, head gasket thickness, and chamber volume.

FAQ

Is this the right kit for my 12-valve?

Yes—if you’re building a 1989–1998 5.9L 12V and machining to +.040" (≈4.055"). Verify piston-to-wall and ring end-gaps per MAHLE specs.

Do pistons come with rings and pins?

Yes. The 930036455 kit includes a full ring set for all six cylinders, floating pins, and clips.

What compression ratio should I expect?

Typical builds with the -54.8 cc dish are around 15.1:1, but your final CR depends on deck, gasket, and chamber specs.

Specifications for Mahle 930036455