I paid about $500 for changeover set for TD42 about 9 months ago. The set included new "crush" spacers and washers.
Be careful when taking the injectors out and especially when handling the "new" ones that no dirt gets into the top of the injector (can happen very easily) and the needles at the opposite end are capped and protected until you are ready to instal each injector so that the needles cannot be damaged.
Also, when putting the "new" ones in double check that you remove the old crush spacers from the head and clean any dirt (especially carbon) from the seats.
Set aside about 2 hours for removal and about 2 hours for installation. If you do it quicker, that is a bonus.




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