Product Description
Restore a clean, leak-free seal between the EGR tube and EGR valve on your 2004.5–2007 GM 6.6L Duramax (LLY/LBZ) with the MAHLE F31909 gasket. Built to OE specs for proper crush and long service life, this direct-fit gasket helps prevent exhaust leaks and soot tracking that rob turbo response and can trigger EGR-related codes.
Fitment
- 2004.5–2005 Chevrolet/GMC 2500HD/3500HD – 6.6L Duramax LLY
- 2006–2007 Chevrolet/GMC 2500HD/3500HD – 6.6L Duramax LBZ
Cross-Reference / Related Mahle Items (CPP Diesel links)
- MAHLE F39394 – EGR Tube to EGR Valve Gasket (06–10 LBZ/LMM)
- MAHLE F31910 – EGR Valve Gasket (06–10 LBZ/LMM)
- MAHLE F31912 – EGR Valve Gasket (06–10 LBZ/LMM)
Notes
Clean both mating surfaces, verify tube alignment, and torque fasteners to factory spec. Re-check after initial heat cycles.
FAQ
Will this fit my 2004.5–2007 Duramax?
Yes—F31909 fits 6.6L LLY (2004.5–2005) and LBZ (2006–2007) trucks when used at the EGR tube-to-EGR valve connection.
Is this a direct OE-style replacement?
Yes, it’s an OE-spec Mahle gasket that replaces GM 97303655.
Do I need sealant?
No. Install the dry gasket unless a factory procedure specifies otherwise.
Specifications for Mahle F31909
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | F31909 |
| Position | EGR tube → EGR valve interface |
| Engine Compatibility | 2004.5–2007 GM 6.6L Duramax LLY/LBZ |
| UPC | 027067721303 |
| GTIN | 027067721303 |
| Shipping | Calculated at checkout; optional shipping insurance available at checkout |
| Prop 65 | This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Learn more |
