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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 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

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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



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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




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N855 Big Cam 
engine manuals and specs
 

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

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engine manuals and specs
 
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

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engine manuals and specs
 

Cummins N855 Big Cam
Connecting Rod Bolts

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


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engine manuals and specs
 
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

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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

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Cummins N855 Big Cam
Bore and stroke

Bore
139.7 mm,  5.5 in

Stroke
152.4 mm,  6.00 in






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Cummins N855 Big Cam
Power and torque

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

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Cummins N855 Big Cam
Dimensions and weight

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

Weight
approx:
2800 lb, 1273 kg


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Big Cam Cummins N855 Manuals, Books, History, Valve and injector set procedures

 


Page Revision #18.5RsC 08-18