Product Description
MAHLE 224-3732.040 is a .040" oversize OE-grade piston set for the 2007.5–2018 Cummins 6.7L ISB. These expansion-controlled pistons use compensated ring grooves to maintain proper ring loading and oil control under heavy towing, daily use, and work-truck duty—delivering quiet operation, long service life, and consistent compression across cylinders.
Fitment
- Engine: Cummins 6.7L ISB (24-valve), Ram 2500/3500/4500/5500 model years 2007.5–2018.
- Size: .040" over (verify bore and piston-to-wall clearance before order/installation).
- Includes: Set of six pistons (pins/clips as supplied by MAHLE); rings sold separately—see ring options below.
Cross-Reference / Related MAHLE Items (Working Internal Links)
- MAHLE 224-3732WR.040 Piston with Rings (.040) – Set of 6
- MAHLE 224-3732WR Piston Set with Rings (STD) – Set of 6
- MAHLE 42140.04 Piston Ring Set (.040) – per cylinder
- MAHLE S42140.020 Piston Ring Set (.020) – per cylinder
- MAHLE S42140 Piston Ring Set (STD) – per cylinder
- MAHLE 224-3802 Marine Bowl Piston Kit (STD) – Set of 6
Why MAHLE for 6.7L Cummins Pistons
- OE-grade alloy & skirt profile for controlled expansion and reduced noise/wear
- Compensated ring grooves for stable sealing and low blow-by
- Precision manufacturing for repeatable clearances and long service intervals
Installation Notes
- Measure cylinder bores; hone to final finish and confirm piston-to-wall clearance per Cummins spec.
- Select matching ring size (e.g., MAHLE 42140.04 for .040 over); check ring end gaps.
- Verify protrusion/combustion bowl orientation and piston pin fitment; lubricate during assembly.
FAQ
Does this set include rings?
No. This listing is pistons only. Pair with MAHLE 42140.04 rings for .040 over builds.
Will these fit any 6.7L Cummins from 2007.5–2018?
Yes for standard 6.7L ISB applications, but always verify oversize (.040") and bore dimensions before purchase.
What bore size corresponds to .040 over?
Approx. 4.250" (107.95 mm). Final size depends on machinist’s finish and target clearances.
Can I buy a version that includes rings?
Yes—see 224-3732WR.040 for a matched piston-with-rings set.
Specifications for Mahle 224-3732.040
| Attribute | Value |
|---|---|
| Brand | MAHLE Original |
| Part Number | 224-3732.040 (Set of 6) |
| UPC (GTIN-12) | 639789271495 |
| GTIN (if different) | 639789271495 |
| Bore / Size | .040" over (approx. 4.250") |
| Configuration | Dish bowl; pins/clips as supplied by MAHLE; rings sold separately |
| Shipping Info | Ships from CPP Diesel; shipping calculated at checkout. Typical boxed weight ~28 lb. |
| Prop 65 | This product can expose you to chemicals including lead and lead compounds, known to the State of California to cause cancer and birth defects or other reproductive harm. More info: www.P65Warnings.ca.gov. |
