When I had the injectors out this winter to satisfy my urge to clean or rebuild them i consulted the board.

I got two points of view on when to replace the heat shields.

Never, they are not moving parts and they will last forever.

or

everytime you remove an injector as they are a crush washer meant for one use.

I have to side with replacing them if you pull an injector.

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sold
1987 300 SDL 318K
126.125 (OM603.961) (722.321 trans) (head#14)
Born on date 11/07/1986
2.5" Flowmaster Exhaust
flex-a-lite dual electric cooling fan conversion

now have a 1985 toyota diesel pickup