# NHTSA Preliminary Evaluation PE04074
> **HYDRAULIC FAN FITTINGS LEAKING** · Opened 2004-11-02 · Closed 2004-12-17
## Investigation
- **Action number:** PE04074
- **Type:** Preliminary Evaluation
- **Open date:** 2004-11-02
- **Close date:** 2004-12-17
- **Manufacturer:** Daimler Commercial Buses NA
- **Affected makes:** ORION
- **Affected components:** ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN
- **Affected model years:** 2002, 2003, 2004
- **Affected (make, year) variants:** 3
## Summary

THIS INVESTIGATION WAS OPENED AFTER ODI VISITED A TRANSIT FLEET FACILITY AND OBSERVED A BUS THAT HAD EXPERIENCED AN ENGINE COMPARTMENT FIRE.AFTER INSPECTING SIMILAR MODEL BUSES, SIX OTHER BUSES WERE FOUND TO HAVE LEAKING HYDRAULIC HOSES, RESULTING IN OILSPRAYINGINTO THE ENGINE COMPARTMENT AND ONTO HOT ENGINE EXHAUST COMPONENTS. ODI OPENED THE INVESTIGATION TO GATHER SPECIFIC INFORMATION CONCERNING THE HOSES, FITTINGSAND TO UNDERSTAND THE INFLUENCE OF HYDRAULIC LEAKAGE AS A CATALYST FOR BUS FIRES. AS A RESULT OF ODI?S INVESTIGATION, ORION HAS AGREED TO INITATE A SAFETY RECALL TO REPLACE THE ORIGINAL RIGID PIPE DESIGN WITH A FLEXIBLE HOSE DESIGN.A COPY OF THE RECALL IS ATTACHED. THIS ACTION RESOLVES THE ISSUES RAISED BY THIS INVESTIGATION. ACCORDINGLY, THIS INVESTIGATION IS CLOSED.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=PE04074)
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