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Cummins N855 Big Cam bolt torques, specifications and links to manuals

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

 
Cummins N855 Big Cam
Main Bearing Bolts
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 Bolts
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 Bolts
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
Main Bearing Bolts
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
Main Bearing Bolts
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
Connecting Rod Bolts
Step 1 = 100 Nm, 75 lb.ft
Step 2 = 230 Nm, 170 lb.ft

 
Cummins N855 Big Cam
Cylinder head Bolts
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 BigCam I thru BigCam IV

 
Cummins N855 Big Cam
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:
139.7 mm,  5.5 in

Stroke:
152.4 mm,  6.00 in

 
Cummins N855 Big Cam
Power
250-400 hp
186 -298 kW @ 2100 rpm

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

Weight:
approx:
2800 lb, 1273 kg

 

BigCam Cummins N855 Manuals, Books, History, Valve and injector set procedures

 


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