Welcome to the forum.

If you had to drive them out, it is likely that they were installed poorly and were not protected from combustion heat and gases.

I would replace them. Unless you are familiar with the procedure and have the tools to do so, i would have a shop or a forum member on this site rebuild them for you.

I have used Monark and Bosio nozzles successfully. I have witnessed Bosch India nozzles and they were slightly less desirable but would work just fine.

Diesel purge will not solve the problem.

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