Description
Rear wiper motor seal for Citroën C8 and Peugeot 807. Washer jet pass-through for the rear window.
This rear wiper motor seal and washer jet pass-through is an essential sealing component used on the tailgate of Citroën C8 and Peugeot 807 models. Designed to prevent water ingress around the rear wiper motor and washer nozzle, the part is commonly searched and ordered by its reference numbers 1400371780, 6405EQ and 6405EP. Well suited for professional workshops and DIY mechanics, this replacement part helps restore reliable washer operation and protect the motor and tailgate electronics from moisture and corrosion.
Technical Information
- Manufacturer: Stellantis / Citroën Peugeot
- Model: Citroën C8, Peugeot 807
- Product Codes: 1400371780, 6405EQ, 6405EP
- Additional Numbers: 6405EP, 6405EQ (alternate references)
Function
The seal creates a watertight passage where the rear washer nozzle and its hose pass through the tailgate and interface with the wiper motor assembly. Its main function is to keep water, dirt and road salt out of the motor housing and electrical connections while allowing the washer jet hose to be routed cleanly to the rear window.
Common Failure Modes
The most frequent causes of failure are material aging and environmental damage: rubber hardening and cracking from UV exposure, deformation from repeated movement of the wiper arm, mechanical wear during service, and ingress of grit or frozen water that splits the seal. Once the seal is compromised, water can reach the motor or electrical contacts and accelerate corrosion or cause intermittent electrical faults.
Replacement And Installation Recommendations
Recommended steps for replacement (suitable for experienced mechanics and competent DIYers):
- Remove the rear wiper arm and cap to expose the retaining nut.
- Remove the tailgate interior trim to access the motor and the seal area.
- Disconnect the washer hose and electrical connector from the motor assembly.
- Remove the old seal/grommet and clean the surrounding area of dirt and corrosion.
- Fit the new seal into the tailgate hole, ensuring the sealing lip sits flush and the washer hose passes through without kinking.
- Reconnect the hose and electrical connector, refit the motor and trim, then reinstall the wiper arm and secure to the correct position.
- Verify sealing and operation by running the washer and wiper through several cycles and checking for leaks.
Practical tips: Use a silicone-based grease or appropriate rubber lubricant to ease installation and protect the seal without degrading the material. Replace any corroded fasteners or damaged hose clips. Avoid overtightening the retaining nut; tighten to the manufacturer specification when available.
When To Replace
Replace the seal if you observe water leaks into the tailgate, visible cracks or hardening of the rubber, poor washer jet alignment caused by a loose or damaged pass-through, or electrical issues in the rear wiper motor suspected to be caused by moisture. Proactive replacement can prevent motor corrosion and costly repairs.
Compatibility And Search Tips
This item is frequently searched by its reference numbers 1400371780, 6405EQ and 6405EP and fits Citroën C8 and Peugeot 807 models. When ordering, using the product codes speeds up identification in parts catalogs.
