In this video I remove diesel injectors, replace seals and refit to engine.

The vehicle had issues with blowing combustion gas past the injector seal and out around the injector, reducing compression and leaving carbon deposits.

This style of injector is common in a lot of ford and PSA diesel engines and the process is roughly the same.

Parts used:
Injector seal kit - https://ebay.us/wSq7GJ

Special tools:
Injector seat cleaning kit - https://ebay.us/XAjN52

Torques:
Injector nuts - 6Nm +65degs (I used 15Nm instead, follow at your own risk)