This is a short version of how to replace injector cups in head on or off engine is the same process. If one is seized ,you have to remove head to get old one out.This is on a volvo 12 liter engine use tool by KTC Vol1516 a 4 piece kit
In my opinion, the d12 and the d13 I think were made to be put in European trucks like the cab over, everything is backward all the gears are in the back under the dog house and they made the dog house a chore to get out.
