Product Description
MAHLE GS33505A fuel injector seal kit restores a reliable, leak-free seal on 2004.5–2007 GM 6.6L Duramax LLY/LBZ injectors. Built to OE standards with high-temp fluoroelastomer O-rings and a new copper tip washer, it’s the proven fix for diesel fuel seepage, hard starts, and return-side leaks—ideal for daily, tow, and fleet trucks.
Fitment
- 2004.5–2007 Chevrolet Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY & LBZ
- One kit services one injector; order 8 kits for all cylinders
What’s Included
- (3) high-temp FKM O-rings
- (1) copper injector sealing washer
Cross-Reference / OE Numbers
- GM: 97327722 (gasket/washer set), 94013303 (injector body O-ring)
- Bosch: F00RJ01086 (copper washer), F00E200099 (O-rings)
Recommended MAHLE Pairings (Internal Links)
- MAHLE HS54580A Cylinder Head Gasket Set – 04.5–07 LLY/LBZ
- MAHLE VS50550 Valve Cover / Lower Rocker Cover Gasket Set – 04.5–07 LLY/LBZ
- MAHLE VS50434 Lower Rocker Cover Gasket Set – 04.5–10 LLY/LBZ/LMM
- MAHLE 95-3727 Engine Gasket Set (w/o Head Gaskets) – 04.5–07 LLY/LBZ
- MAHLE F31909 EGR Tube-to-Valve Gasket – 04.5–07 LLY/LBZ
- MAHLE GS33500A Injector Seal Kit – 01–04 LB7 (alternate for earlier years)
Installation Notes
- Clean injector and bore; lightly oil O-rings; always replace the copper washer
- Verify LLY/LBZ fitment by VIN/engine code; torque lines per GM spec
FAQ
Will GS33505A fit both LLY and LBZ?
Yes—this kit is designed for 2004.5–2007 LLY/LBZ applications.
How many kits do I need?
One kit per injector—order eight to service the full set.
What materials are the O-rings?
High-temperature fluoroelastomer (FKM) suitable for diesel fuel environments.
Is the copper tip washer included?
Yes—this kit includes a new copper injector sealing washer.
Specifications for Mahle GS33505A
| Attribute | Value |
|---|---|
| Brand | MAHLE Original |
| Part Number | GS33505A |
| UPC | 027067890719 |
| Shipping Info | Ships from CPP Diesel; shipping calculated at checkout. Typical pkg dims (listing): 7.00" W × 6.00" H × 4.00" D. |
| 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. |
