Cummins V/VT 378, 504 and 555 Torque Specifications

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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 and V-504 Cylinder Head Capscrew Torque	ft-lb	N-m
V-378 and V-504 Cylinder 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 Cylinder Head Capscrew Torque	ft-lb	N-m
V-555 Cylinder 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

* Follow Sequence Below

Cylinder Head Tightening Sequence - V6

Cylinder Head Tightening Sequence - V8

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

Capscrew Markings and Torque Values
Capscrew Body Size	SAE 1 or 2	SAE 5	SAE 6 or 7	SAE 8
Capscrew Body Size	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]