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Cummins QSK38 and QSK50 Essential Diesel Engine Bolt Tightening Torques

 
Cummins QSK38 and QSK50 Main Bearing Bolt torque 

Main Bearing capscrews
step 1 = 265 Nm, 195 lb.ft
step 2 = 605 Nm, 445 lb.ft
step 3 = loosen
step 4 = 265 Nm, 195 lb.ft
step 5 = 605 Nm, 445 lb.ft

Main Bearing mounting capscrews
step 1 = 176 Nm, 130 lb.ft
step 2 = 339 Nm, 250 lb.ft
step 3 = loosen
step 4 = 339 Nm, 250 lb.ft
step 5 = + 90°

Cummins QSK38 and QSK50 Connecting Rod Bolt torque 

(Manual Vol 3)
step 1 = 108 Nm, 80 lb.ft
step 2 = 217 Nm, 160 lb.ft
step 3 = 325 Nm, 240 lb.ft
step 4 = loosen
step 5 = 108 Nm, 80 lb.ft
step 6 = 217 Nm, 160 lb.ft
step 7 = 325 Nm, 240 lb.ft
step 8 = 365 Nm, 270 lb.ft

Cummins QSK38 and QSK50 Cylinder Head Bolts torque 

step 1 = 270 Nm, 200 lb.ft
step 2 = 407 Nm, 300 lb.ft
step 3 = 555 Nm, 410 lb.ft


Cummins QSK38 & QSK50 Diesel Engine Specs

 
Cummins QSK38 and QSK50 Displacement, arrangement and compression ratio 

Displacement
QSK38 - 38 liter, 2300 CID
QSK50 - 50 liter, 3067 CID

Arrangement
QSK38 -
V12 turbocharged after-cooled

QSK50 -
V16 turbocharged after-cooled

Compression Ratio
Range from 13.5:1 to 15.5:1 Depending on CPL number

Cummins QSK38 and QSK50 Engine Power and Torque 

QSK38
Marine
1200-1400 hp, 895-1044 kW
@ 1500-1800 rpm

QSK50
Drilling Genset
1400-1600 hp, 1044-1715 kW
@ 1200-1800 rpm


Cummins QSK38 and QSK50 Bore, stroke and weight 

Bore
6 1/4", 158.75 mm

Stroke
6 1/4", 158.75 mm

Weight approx:
QSK38
4 640 kg, 10 230 lb

QSK50
5 700 kg, 12 566 lb

Cummins QSK38 and QSK50 approx Dimensions 

QSK38
Marine + accessories
length 2688 mm, 106 in
width 1642 mm, 65 in
height 2108 mm, 83

QSK50
length 2609 mm, 1063 in
width 1492 mm, 59 in
height 1910 mm, 75 in



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