Cummins ISX11.9 CM2250 – Service Manual 017-016   Straight Thread Fittings

Remove the straight thread fitting.

Use cleaner, Part Number 3824510 or equivalent, to clean the threads of the straight thread fittings and threaded bores.

Inspect the threads of the fittings for mutilation or other damage.

Inspect the threaded bores for damage.

Adjustable style fittings in straight thread bosses or holes apply to all fittings (elbows, connectors, tees, check valves, etc.) that have straight threads, an o-ring, a backup washer, and a locknut.

Install a new o-ring onto the fitting.

Lubricate the o-ring.

Raise the locknut, to permit the backup washer to be installed in the extreme upper end of the groove.

Install the fitting into the straight thread boss or hole to full depth, where the metal backup washer contacts the face of the boss or hole.

Position the fitting by turning it out counterclockwise up to a maximum of one turn.

Holding the pad of the fitting with a wrench, tighten the locknut and washer against the face of the boss or hole to the specified torque value. Refer to the OEM service manual for torque specifications.