Cummins N14 STC, Celect, Celect Plus – Service Manual 017-016   Straight Thread Fittings

Select the appropriate size wrench and remove the fitting.

Use spray cleaner, Part Number 3823717 or equivalent, to clean the threads of the straight thread fittings and threaded bores.

Inspect the threads of the fittings for damage.

Inspect the threaded bores for damage.

Adjustable style fittings in straight thread bosses or holes applies to all fittings (elbows, connectors, tees, check valves, etc.) that have straight threads, an o-ring, a backup washer, and a locknut. Before installation, install a new o-ring onto the fitting and 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.