Motor aplicable:
LLY / LBZ
Marca aplicable:
GMC / Chevrolet
Vehículo aplicable:
Silverado / Express Van
Parámetros del producto:
| Desplazamiento | Combustible | Cilindro | Valle | Árbol de levas | Año |
| 6.6L |
Gasolina
|
4 | 16 | 1 | 2004- |
Culata
Culata para GMC Chevrolet Duramax LLY LBZ 6.6L Turbo Diesel 97779579 98025702
Introducción
Producto N.º
| ML NÚMERO. | N.º de OEM | NÚMERO DE REF. |
| MLG064A | 97779579 | |
| MLG064B | 98025702 |
Información del producto Culata
1. Descripción general del producto
El LLY (2004.5–2005) y LBZ (2006–2007) are both 6.6L V8 turbocharged diesel engines from GM’s Duramax family, con cast aluminum cylinder heads, 32-valve DOHC valvetrain, y inyección directa de riel común. They are known for strong towing performance, efficiency, and mechanical durability.
Both engines use similar cylinder heads with minor differences in coolant port designs and emissions sensor locations, making replacement heads mostly interchangeable with small modifications.
2. Especificaciones técnicas
| Artículo | LLY / LBZ |
|---|---|
| Cilindrada del motor | 6.6L (6599 cc) |
| Tipo de motor | V8, 90° |
| Material de la culata | Aluminio fundido |
| Tren de válvulas | DOHC, 32-Valve (4 valves per cylinder) |
| Aspiración | Turbocharged with intercooler |
| Sistema de combustible | High-pressure common rail (Bosch) |
| Pernos de cabeza | 18 per head (torque-to-yield) |
| Enfriamiento | refrigerado por agua |
| Turbo Type | Variable Geometry Turbo (VGT) |
| Emisiones | LLY: no DPF, LBZ: pre-DPF (no SCR/DEF yet) |
3. OEM & Reference Part Numbers
| Motor | OEM Cylinder Head Number |
|---|---|
| LLY | 98055650 / 98055651 (L/R) |
| LBZ | 98060819 / 98060820 (L/R) |
| Casting Codes | 97229810, 97229808, 98060819, 98055650 |
Both LLY and LBZ heads can be used interchangeably with slight port gasket differences.
4. Vehículos compatibles
| Hacer | Modelo | Años | Motor |
|---|---|---|---|
| Chevrolet | Silverado 2500HD / 3500 | 2004.5–2007 | LLY / LBZ |
| GMC | Sierra 2500HD / 3500 | 2004.5–2007 | LLY / LBZ |
| Chevrolet | Express Van 2500 / 3500 | 2006–2007 | LBZ |
| GMC | Savana Van 2500 / 3500 | 2006–2007 | LBZ |
| Chevrolet / GMC | Kodiak / Topkick C4500+ | Some variants | LLY / LBZ |
5. Opciones de producto
| Tipo | Descripción |
|---|---|
| Culata desnuda | Casting only – no valves or cams |
| Loaded Head | Includes valves, valve guides, seals, retainers, keepers |
| Complete Assembled Head | Fully built with valves, springs, camshafts, injectors seats (if needed) |
High-strength cast aluminum
Pressure tested to 150 psi
CNC-machined deck surface and cam journals
Compatible with OEM rocker assemblies and head gaskets
6. Notas de instalación
- Usar nuevos pernos de culata con relación par-rendimiento (TTY) o ARP studs
- Seguir GM torque sequence: multiple stage torque-angle procedure
- Clean all bolt threads and apply GM-recommended sealant/oil
- Reemplazar head gasket with high-quality MLS type (Mahle, Victor Reinz)
- Verify injector cup sealing (LLY/LBZ use pressed-in injector cups)
- Prime oil system before first start and check coolant pressure
7. Problemas comunes de la culata y consejos de reparación
| Asunto | Symptoms | Causa | Solución recomendada |
|---|---|---|---|
| Culata agrietada | Coolant in oil, white smoke | Overheat or poor casting | Replace head, inspect for coolant cross-leak |
| Superficie de cubierta deformada | Junta de culata quemada | Overheating or improper torque | Resurface and use upgraded head gaskets |
| Injector Cup Leak | Coolant in cylinder, misfire | Failed cup seal | Replace cups and reseal with Loctite or equivalent |
| Coolant Cross-Contamination | Random misfire, pressurized coolant | Casting porosity or warp | Reemplace el cabezal y el bloque de prueba de presión |
| Valve Seat Erosion | Power loss, compression drop | Poor fuel or overheat | Replace seat or full valve job |
8. Mercados de exportación y servicios
- USA & Canada: Primary market (HD trucks, vans)
- Mexico / Central America: Exported HD pickups
- África: Towing fleet & rebuilt engine market
- Oriente Medio: Used HD fleet and custom vehicle platforms
- Australia / Nueva Zelanda: LHD-to-RHD converted Dually trucks
- Sudamerica: Custom diesel conversion market