N14 Base Engine Troubleshooting and Repair 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 mutilation or 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.

Refer to 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 [11 to 13 ft-lb]	8.2 to 9.0 N•m [72 to 80 in-lb]
9/16-18	30 to 34 N•m [22 to 24 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: 16-Feb-2005