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Cummins V/VT 378, 504 and 555 Torque Specifications

Pipe Plug Torque Specs.
Size ft-lb N-m
1/8 5-7 7-9
1/4 15-20 20-27
3/8 20-25 27-34
1/2 20-25 27-34
3/4 25-30 34-41
1 inch. 40-45 54-61
Side Capscrews
Torque ft-lb N-m
1. Tighten to 35-40 47-54
1. Tighten to 100-110 136-149
Plate Capscrew Torque ft-lb N-m
  20-23 27-31
Main Bearing Capscrews
Torque Sequence ft-lb N-m
1. Tighten to 55-65 75-88
2. Advance to 115-125 156-170
3.Advance to 165-175 224-237
4. Loosen All
5. Repeat Steps 1,2 and 3
V-378 & V-504 Cyl. Head Capscrew Torque ft-lb N-m
*1. Tighten to 80-90 108-122
*2. Tighten to 110-115 149-156
Cylinder Head Plug Specs.
Size ft-lb N-m
1/8 5-10 7-14
Fuse Plug 5-10 7-14
3/8 35-45 47-61
1/2 60-70 81-95
3/4 65-75 88-102
1 inch. 135-145 183-197
Connecting Rod Nut
Torque Sequence V/VT 555 ft-lb N-m
1. Tighten to 40-45 54-61
2. Advance to 85-90 115-122
3. Loosen All
4. Tighten to 40-45 54-61
5. Advance 60° in 30° increments
Connecting Rod Nut
Torque Sequence V 378,504 ft-lb N-m
1. Tighten to 20-25 27-34
2. Advance to 50-55 68-75
3. Loosen All
4. Tighten to 20-25 27-34
5. Advance 60° in 30° increments
V-555 Cyl. Head Capscrew Torque ft-lb N-m
*1. Tighten to 25-30 34-41
*2. Tighten to 80-90 108-122
*3. Tighten to 135-140 183-190
* Follow Sequence Below Cylinder Head Tightening Sequence - V6
* Follow Sequence Below Cylinder Head Tightening Sequence - V8

Note: The capscrews securing the rocker lever assembly are part of the cylinder heads capscrews.

Capscrew Markings & Torque Values
Capscrew Body Size SAE 1 or 2 SAE 5 SAE 6 or 7 SAE 8
Ft-lb [N-m] Ft-lb [N-m] Ft-lb [N-m] Ft-lb [N-m]
1/4-20 5 [7] 8 [11] 10 [14] 12 [16]
1/4-28 6 [8] 10 [14]   14 [19]
5/16-18 11 [15] 17 [23] 19 [26] 24 [33]
5/16-24 13 [18] 19 [26]   27 [37]
3/8-16 18 [24] 31 [42] 34 [46] 44 [60]
3/8-24 20 [27] 35 [47]   49 [66]
7/16-14 28 [38] 49 [66] 55 [75] 70 [95]
7/16-20 30 [41] 55 [75]   78 [106]
1/2-13 39 [53] 75 [102] 85 [115] 105 [142]
1/2-20 41 [56] 85 [115]   120 [163]
9/16-12 51 [69] 110 [149] 120 [163] 155 [210]
9/16-18 55 [75] 120 [163]   170 [231]
5/8-11 83 [113] 150 [203] 167 [226] 210 [285]
5/8-18 95 [129] 170 [231] 240 [325]
3/4-10 105 [142] 270 [366] 280 [380] 375 [508]
3/4-16 115 [156] 295 [400]   420 [569]
7/8-9 160 [217] 395 [536] 440 [597] 605 [820]
7/8-14 175 [237] 435 [590]   675 [915]
1-8 235 [319] 590 [800] 660 [895] 910 [1234]
1-14 250 [339] 660 [895]   990 [1342]