BMW X5 X6 E70 Partition Bulkhead Engine Compartment 51717169419 51717169420 51717169421 SET

Description

The Engine Compartment Partition Bulkhead Set (Part #s 51717169419, 51717169420, 51717169421) consists of the three engine bay shield panels mounted directly behind the engine and below the windshield cowl on E70 X5 and E71 X6 models.

Together, these three partitions form the primary weather barrier separating the hot engine bay from the cabin air intake, wiper assembly, brake booster, and electronic control modules (DME/ECU).

Over time, radiant engine heat causes the brittle plastic and rubber seals on these original panels to crack, break at the mounting tabs, or crumble. When they fail, water flows directly into the lower bulkhead, leading to flooded brake boosters, rusted wiper linkages, wet passenger footwells, and damaged electrical wiring.

Part Numbers Included in Complete 3-Piece Set

Technical Specifications

• Material: High-density, heat-stabilized ABS composite with integrated flexible perimeter rubber weatherstripping.

• Mounting Location: Rear engine compartment firewall / lower wiper cowl structure.

• Quantity: 3-Piece Complete Set (Center + Left + Right).

Vehicle Compatibility

Fits all engine configurations (N52, N54, N55, N63, S63, M57 diesel) across the following chassis:

• BMW X5 (E70 Chassis): 3.0si, 4.8i, xDrive30i, xDrive35i, xDrive35d, xDrive50i, X5 M (2007–2013)

• BMW X6 (E71 / E72 Chassis): xDrive35i, xDrive50i, ActiveHybrid X6, X6 M (2008–2014)

Key Functions & Failure Symptoms

Key Functions

• Water & Rain Channeling: Directs rainwater off the windshield cowl (51717151969) toward the outer fender drain tubes.

• Thermal Heat Shielding: Blocks intense turbo and exhaust manifold heat from degrading cabin intake filters and rubber brake lines.

• Acoustic Dampening: Reduces engine mechanical noise entering the passenger cabin.

Common Symptoms of Broken Bulkhead Panels

• Water in Passenger Footwell: Rain water leaking past cracked partition seals directly into the HVAC blower intake.

• Corroded Wiper Transmission / Brake Booster: Water pooling in the lower firewall recess due to broken drainage guidance.

• Broken Plastic Retaining Clips: Panels loose or vibrating against the firewall due to heat-snapped mounting ears.