Injector heat shield replacement issue CK30 2008 with 824 hours

[DOCatRU]

Hi folks:

2008 CK30

I am in the process of installing my rebuilt injector pump (rebuilt by thepumpguysc) and the first step is to reinstall the injectors.

I have tried the method recommended in the manual (inserting a screwdriver to spin the heat shield and lift it out).

I squirted some PB blaster in the hole, waited and they still won't budge one iota.

Any other suggestions for how to get these suckers out? I don't want to damage anything.

The tractor has 824 hours on it. Do I REALLY need to replace the heat shields?

Thanks,

DOC