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GMB 440-8840 Engine Timing Idler
| Brand | GMB 440-8840 |
|---|---|
| Drive Belt Pulley Diameter (1) (mm) | 1 |
| Pulley / Belt Type | Serpentine & v-belt |
| Pulley Groove Quantity (1) | 1 |
| Pulley Material (1) | Metal |
| Fits | Geo and Isuzu · 11 vehicles |
OE-spec construction. Manufactured to meet or exceed OEM specifications.
Metal pulley. Built with a metal pulley for dependable belt guidance.
Serpentine and V-belt. Works with both serpentine and V-belt applications.
Cross-references Four Seasons 85184, Gates T42001 and 4408840 for the same application. See all 4.
Engine Timing Idler for Geo and Isuzu
GMB 440-8840 is an engine timing idler built to meet or exceed OEM specifications for dependable belt routing and timing system support. It is a direct-fit replacement for select Geo and Isuzu applications, including the Geo Storm and several Isuzu models.
Key Features
- Engine timing idler for valve train and belt drive service
- Metal pulley construction for durability in engine bay conditions
- Serpentine and V-belt pulley type
- 1-groove pulley design
- Built to meet or exceed OEM specifications
- Part number 440-8840 for easy identification
Detailed Description
This GMB timing idler is engineered for vehicles that require stable belt guidance and consistent pulley operation in the timing system. The metal pulley construction and single-groove design support proper belt tracking in applications using serpentine and V-belt layouts. It is a practical OE-style replacement for 1990-1993 Geo Storm, 1990-1992 Isuzu Impulse, 1991-1992 Isuzu Stylus, and 1989 Isuzu I-Mark models. This part number, 440-8840, also cross-references Four Seasons 85184 and Gates T42001 for the same application.
What It Helps Address
- Noise from a worn or rough timing idler pulley
- Belt tracking issues caused by pulley wear
- Timing system service on Geo Storm and Isuzu engine applications
- Replacement of a damaged or corroded metal pulley
- Restoring proper belt routing in serpentine and V-belt systems
Installation Notes and Tips
Verify pulley diameter, groove count, and belt type against the original component before installation. Confirm vehicle application by year and model, especially for 1990-1993 Geo Storm, 1990-1992 Isuzu Impulse, 1991-1992 Isuzu Stylus, and 1989 Isuzu I-Mark. Inspect the surrounding timing components and belt condition during service to ensure the new idler operates correctly.
Quality Assurance
GMB manufactures this timing idler to meet or exceed OEM specifications, supporting consistent fit and function for the listed applications.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1993 | Geo | Storm | 1.8L | L4 | N/A | — |
| 1992 | Geo | Storm | 1.8L | L4 | N/A | — |
| 1992 | Isuzu | Impulse | 1.6L | L4 | N/A | — |
| 1992 | Isuzu | Impulse | 1.8L | L4 | N/A | — |
| 1992 | Isuzu | Stylus | 1.8L | L4 | N/A | — |
| 1991 | Geo | Storm | 1.6L | L4 | N/A | — |
| 1991 | Isuzu | Impulse | 1.6L | L4 | N/A | — |
| 1991 | Isuzu | Stylus | 1.6L | L4 | N/A | — |
| 1990 | Geo | Storm | 1.6L | L4 | N/A | — |
| 1990 | Isuzu | Impulse | 1.6L | L4 | N/A | — |
| 1989 | Isuzu | I-Mark | 1.6L | L4 | N/A | — |
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