Cummins N14 STC, Celect, Celect Plus - Service Manual 017-011 Straight Thread Plug

Remove

Select the appropriate size wrench or socket and remove the plug.		SMALL \| MEDIUM \| LARGE

Use spray cleaner, Part Number 3823717 or equivalent, to clean the threads of the straight thread plug and threaded bores.		SMALL \| MEDIUM \| LARGE

Inspect the threads of the plug for damage.

Inspect the threaded bores for damage.

Install a new o-ring on the plug. The o-ring used by Cummins Inc., is the only one recommended by Cummins® Engine Company.

Lubricate with clean 14W-40 oil.

Install and tighten the plugs. Reference the following chart for torque values.

Tighten straight thread plugs to the value indicated in the Torque Values table.

Torque Values
Thread Size	Steel Fitting (In Cast Iron or Steel)	Brass Fittings
5/16-24	5 to 6 N•m [45 to 50 in-lb]	3.1 to 3.4 N•m [27 to 30 in-lb]
3/8-24	10 to 11 N•m [90 to 100 in-lb]	5.1 to 5.7 N•m [45 to 50 in-lb]
7/16-20	15 to 17 N•m [135 to 150 in-lb]	6.5 to 7.3 N•m [58 to 65 in-lb]
½-20	15 to 18 N•m [133 to 159 ft-lb]	8.2 to 9.0 N•m [72 to 80 in-lb]
9/16-18	30 to 34 N•m [22 to 25 fl-lb]	12.7 to 14.1 N•m [112 to 125 in-lb]
¾-16	50 to 56 N•m [37 to 41 ft-lb]	24 to 28 N•m [18 to 21 ft-lb]
7/8-14	71 to 79 N•m [52 to 58 ft-lb]	38 to 39 N•m [26 to 29 ft-lb]
1 1/16-12	102 to 113 N•m [75 to 83 ft-lb]	50 to 56 N•m [37 to 41 ft-lb]
1 3/16-12	122 to 136 N•m [90 to 100 ft-lb]	64 to 71 N•m [47 to 52 ft-lb]
1 5/16-12	142 to 157 N•m [105 to 116 ft-lb]	71 to 79 N•m [52 to 58 ft-lb]
1 5/8-12	213 to 237 N•m [157 to 175 ft-lb]	91 to 102 N•m [67 to 75 ft-lb]
1 7/8-12	305 to 339 N•m [225 to 250 ft-lb]	102 to 115 N•m [75 to 85 ft-lb]
2 ½-12	457 to 509 N•m [337 to 375 ft-lb]	126 to 141 N•m [93 to 104 ft-lb]

Last Modified: 31-Oct-2011