G5 — NOZZLE BORE

For the G5.

Procedure

1. Inspect condition of threads for gland nut. Threads are metric (M28 x 1.5). ,
2. Inspect condition of nozzle seating surface in cylinder head. Cylinder head threads and nozzle seating surface must be free of debris and carbon deposits. 3 ee a IMPORTANT: lf the injection nozzle gland nut threads are not clean, a false torque reading may be obtained when the injection nozzle is installed. This may prevent the injection nozzle from seating properly in the cylinder head.
3. Clean threads which have light foreign deposits using . i) a drill and the Di7030BR Thread Cleaning Brush. Work 4) brush up and down several times to clean threads. - os ’ “ —AG,CTM42,G5,14 -19-O8FEB94
4. Clean threads with heavy foreign deposits or clean up damaged threads using the JDF5 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. = <ierew « - | §. Clean nozzle seating surface by using the JDG609 Nozzle Seat Reamer (A) to remove carbon.
5. Blow out debris with compressed air and thoroughly clean all nozzle bores. $11,2005,NU — -19-23AUG91 CTM86 (260CT94) 05-28 Series 450 6081 Diesel Engines 271094

Source: manual:Component Technical Manual 8.1L 6081 1994.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.