Cylinder Head and Valves
4. Clean threads with heavy foreign deposits or clean up
damaged threads using the JDE5 Tap (M28 x 1.5 mm)
or an equivalent M28 x 1.5 mm (metric) tap (A). Be
sure to start tap straight to avoid possible
cross-threading. A light coat of grease on tap will help
collect foreign deposits on tap and prevent them from
falling into the nozzle bore.
Using Tap on Nozzle Bore Threads
5. Clean nozzle seating surface by using the JDG609
Nozzle Seat Reamer (A) to remove carbon.
6. Blow out debris with compressed air and thoroughly
clean all nozzle bores.
Cleaning Nozzle Seating Surface