Product Description
MAHLE K31904 water pump seal restores the OEM coolant seal integrity between the water pump housing and timing cover on 2001–2016 GM Duramax engines. Designed to meet or exceed factory standards, this high-temperature elastomer seal prevents leaks and coolant loss in Duramax cooling systems under high thermal load.
Fitment
- 2001–2004 Chevrolet Silverado/GMC Sierra 2500HD/3500HD – 6.6L LB7 Duramax
- 2004.5–2007 Chevrolet Silverado/GMC Sierra 2500HD/3500HD – 6.6L LLY / LBZ Duramax
- 2007.5–2010 Chevrolet Silverado/GMC Sierra 2500HD/3500HD – 6.6L LMM Duramax
- 2011–2016 Chevrolet Silverado/GMC Sierra 2500HD/3500HD – 6.6L LML Duramax
- Seals water pump housing to timing cover. Fits all OEM and MAHLE replacement pumps.
What’s Included
- (1) OEM-style water pump-to-timing cover seal ring (rubber/elastomer construction)
Cross-Reference / OE Numbers
- GM OE: 97216196
- ACDelco: 217-3177
- Mahle: K31904
Recommended MAHLE Pairings (Internal Links)
- MAHLE GS33493 Cylinder Head Bolt Set – 98.5–18 Cummins 5.9L/6.7L
- MAHLE 48384 Rear Main Seal – 1989–2018 5.9L/6.7L
- MAHLE CS54556 Conversion Gasket Set – 03–07 5.9L
Why MAHLE
- OE-quality rubber and sealing bead geometry for precise coolant sealing
- Resists coolant additives and temperature extremes
- Exact-fit design for Duramax water pump replacements and rebuilds
Installation Notes
- Clean mating surfaces and remove all debris or old gasket material
- Lubricate lightly with coolant-safe grease before reassembly
- Torque bolts evenly per OEM service manual specifications
FAQ
Does K31904 fit all Duramax water pumps from 2001–2016?
Yes — K31904 fits LB7, LLY, LBZ, LMM, and LML engines using factory or Mahle pumps.
Is this a full water pump kit?
No — this listing is for the seal only. Use it with an existing or new water pump assembly.
Can I reuse my old seal?
Not recommended. Always replace the seal when servicing or replacing the water pump to ensure proper sealing.
What’s the UPC/GTIN for this part?
GTIN / UPC: 027067434395.
Specifications for Mahle K31904
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | K31904 |
| UPC / GTIN | 027067434395 |
| Shipping Info | Ships from CPP Diesel; lightweight gasket component, small parcel shipping applies. |
| Country of Origin | Not specified |
| 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. For more information, visit www.P65Warnings.ca.gov. |
