Alexander Dennis Enviro 400 H: Cummins’ Isb4.5 210hp Eurovi Engine Valve Cover Cracking Safety Campaign
Recall Summary Alexander Dennis is recalling 401 Enviro 400 H buses with Cummins ISB4.5 210HP EuroVI engines because the piston crown can crack, which increases pressure inside the engine and may cause the valve cover to fracture. A cracked valve cover can leak oil that could catch fire if it contacts a hot surface. The fix involves installing a crankcase pressure sensor and a pressure relief valve.
- Recalling firm
- ALEXANDER DENNIS
- Product
- Vehicles: ALEXANDER DENNIS ENVIRO 400 H. Units affected: 401
- Reason
- On vehicles with the affected engine the piston crown may develop a crack creating elevated crankcase pressure leading to a fracture of the valve cover. A fractured valve cover may allow oil to escape and in the presence of an ignition source increases the risk of a fire. Remedy: Install a crankcase pressure sensor and a pressure relief valve.
- Classification
- Class I
- Category
- vehicle recall
- Country
- United Kingdom
- Agency
- UK Driver and Vehicle Standards Agency
- Recall date
- 2025-11-05
- Status
- Ongoing
- Distribution
- United Kingdom
Official recall notice from UK Driver and Vehicle Standards Agency
Recall details on Nibble Recalls: https://trynibble.app/recalls/ab42d4d6-e07d-4acc-8fa7-17d3d0d761b8