Description
Rear wiper motor seal for CITROËN C8 and Peugeot 807. Washer jet passage.
This rear wiper motor seal is designed to seal the rear wiper motor housing and provide a watertight passage for the washer jet on Citroën C8 and Peugeot 807 models. Ideal for professional garages and DIY mechanics, the part restores the correct sealing around the motor spindle and washer nozzle, preventing water ingress and ensuring reliable rear wiper operation. Frequently searched by part numbers 1400371780, 6405EQ and 6405EP.
Technical Information
Manufacturer: Stellantis (Citroën/Peugeot)
Model: Citroën C8, Peugeot 807
Product Codes: 1400371780, 6405EQ, 6405EP
Additional Numbers: 1400371780 / 6405EQ / 6405EP
Function And Compatibility
The part acts as a sealing gasket/grommet between the rear wiper motor and the tailgate panel, while also providing the correct routing and sealing for the washer jet feed. It fits the rear wiper motor assembly on Citroën C8 and Peugeot 807 vehicles where the listed part numbers apply. Use the part numbers in search queries to quickly find the correct match for your vehicle.
Replacement Procedure (Summary)
- Park the vehicle on a level surface and isolate the electrical system (disconnect the negative battery terminal) to avoid accidental wiper operation.
- Remove the rear wiper arm (protect the paint and trim) and the outer tailgate trim to access the wiper motor area.
- Disconnect the washer hose and electrical connector from the motor assembly.
- Unscrew the wiper motor mounting bolts and withdraw the motor to expose the old seal/grommet and washer passage.
- Remove the old seal, clean mating surfaces of dirt and corrosion, fit the new seal ensuring correct orientation and full seating of the washer passage, then reassemble in reverse order.
- Test the wiper and washer function after reassembly and check for any leaks around the seal.
Installation Recommendations
- Ensure mating surfaces are clean and dry before installing the new seal to achieve a proper watertight fit.
- Apply a light silicone grease to the seal to ease installation and improve long-term sealing (avoid petroleum-based lubricants that can degrade rubber).
- Tighten mounting fasteners to manufacturer torque settings and check washer hose routing to prevent kinks.
- After installation, run several cycles of the washer and wiper to confirm proper operation and that no water enters the tailgate interior.
- If corrosion is present on the motor spindle or mounting area, treat or replace affected components to avoid premature failure of the new seal.
Common Failure Reasons
Seal failure typically results from age-related rubber degradation (hardening, cracking), prolonged exposure to UV, mechanical abrasion during repeated wiper movement, and corrosion of surrounding metal parts that distorts the sealing surface. Water ingress through a damaged or displaced seal can lead to motor corrosion and electrical faults, reduced washer fluid flow, or water entering the tailgate cavity.
Why Choose This Part
Replacing the rear wiper motor seal with the correct part number (1400371780, 6405EQ, 6405EP) restores sealing integrity, prevents water damage to the motor and tailgate interior, and maintains reliable washer jet routing. The part is suitable for workshop use and competent DIY repairs on Citroën C8 and Peugeot 807 vehicles.
