[ngoma]

Heatshield seals injector nozzle face to cylinder head by way of getting deformed (compressed) between the two during installation. Also allows heat transfer from nozzle end to head (which itself is cooled by circulating coolant). Compare a used one to a new one and you will see the extended inner section on the new one is compressed flush with the outer section on the used one.

As such, heatshield is a one-shot deal, not likely to seal as well on second use.

Don't make your problems worse!

Theoretically there is a way to re-form them using a ball bearing and visegrip pliers with a welded-on flange. Anyone here tried that?