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Cummins N855 Big Cam I thru Big Cam III step by step essential bolt tightening torques

 
Cummins N855 Big Cam Main Bearing Bolt Torque 

Step 1 = 85 lb.ft, 115 Nm
Step 2 = 170 lb.ft, 230 Nm
Step 3 = 255 lb.ft, 345 Nm
Step 4 = Loosen
Step 5 = 85 lb.ft, 115 Nm
Step 6 = 170 lb.ft, 230 Nm
Step 7 = 255 lb.ft, 345 Nm

Cummins N855 Big Cam Connecting Rod Bolt Torque 

Step 1 = 100 Nm, 75 lb.ft
Step 2 = 200 Nm, 150 lb.ft
Step 3 = Loosen
Step 4 = 100 Nm, 75 lb.ft
Step 5 = 200 Nm, 150 lb.ft

Cummins N855 Big Cam Cylinder Head Bolt Torque 

Step 1 = 30 Nm, 25 lb.ft
Step 2 = 135 Nm, 100 lb.ft
Step 3 = 340 Nm, 305 lb.ft


Cummins N855 Big Cam IV step by step essential bolt tightening torques

 
Cummins N855 Big Cam IV Main Bearing Bolt Torque 

1" bolts:
Step 1 = 110 lb.ft, 150 Nm
Step 2 = 210 lb.ft, 285 Nm
Step 3 = 305 lb.ft, 415 Nm
Step 4 = Loosen
Step 5 = 110 lb.ft, 150 Nm
Step 6 = 210 lb.ft, 285 Nm
Step 7 = 305 lb.ft, 415 Nm

Cummins N855 Big Cam IV Main Bearing Bolt Torque 

3/4" bolts:
Step 1 = 90 lb.ft, 120 Nm
Step 2 = 170 lb.ft, 230 Nm
Step 3 = 255 lb.ft, 345 Nm
Step 4 = Loosen
Step 5 = 90 lb.ft, 120 Nm
Step 6 = 170 lb.ft, 230 Nm
Step 7 = 255 lb.ft, 345 Nm


Cummins N855 Big Cam IV Connecting Rod Bolt Torque 

Step 1 = 100 Nm, 75 lb.ft
Step 2 = 230 Nm, 170 lb.ft

Cummins N855 Big Cam IV Cylinder Head Bolt Torque 

Step 1 = 35 Nm, 25 lb.ft
Step 2 = 135 Nm, 100 lb.ft
Step 3 = 385 Nm, 285 lb.ft

N855 Common Specs from Big Cam I thru Big Cam IV

 
Cummins N855 Big Cam Displacement and arrangement 

Displacement
14.0 liter, 855 CID

Arrangement
6 cylinder in-line engine with naturally aspirated, turbocharged, and turbo aftercooled variants

Cummins N855 Big Cam Bore and stroke 

Bore
139.7 mm, 5.5 in

Stroke
152.4 mm, 6.00 in


Cummins N855 Big Cam Power and torque 

Power (normal range)
250-400 hp, 186-298 kW @ 2100 rpm

Power (some later standby gensets)
rated at 600 hp, 450 kW

Torque (400 hp engine)
1150 lb.ft, 1559 Nm @ 1500 rpm

Cummins N855 Big Cam approx Dimensions and weight 

Dimensions
length 1496 mm, 59 in
width 863 mm, 34 in
height 1293 mm, 51 in

Weight
2800 lb, 1273 kg


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Essential bolt torques are:
 main bearing cap bolts 
 connecting rod cap bolts
cylinder head bolt torques
 


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