Cummins B3.9, B4.5, B4.5 RGT, and 5.9L Torque Specs: Essential Information for Maintenance

The Cummins B3.9, B4.5, B4.5 RGT, and 5.9L engines are renowned for their efficiency and reliability across various industries. Whether used in industrial machinery, agricultural equipment, or commercial vehicles, maintaining these engines requires precise torque specifications for optimal performance. In this guide, we provide the crucial torque specs to ensure your Cummins engines operate smoothly and deliver long-term reliability.

Cylinder Head

PART/MATERIAL/COLOR	LENGTH	TORQUE VALUE IN NM [ FT-LB ]
CYLINDER HEAD CAPSCREWS (4-CYLINDER ENGINE ALL CAPSCREWS)	N/A	90 N•M [ 66 FT-LB ]

NOTE: On a four cylinder engine, capscrew number 1 is located in between cylinders 2 and 3. The numbered sequence is the same as a six cylinder, but stops at capscrew number 18.

 

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

CYLINDER HEAD CAPSCREWS (6-CYLINDER ENGINE ALL CAPSCREWS)	N/A	90 N•M [ 66 FT-LB ]
CYLINDER HEAD CAPSCREWS (4-CYLINDER ENGINE, LONG CAPSCREWS NUMBERS 4, 5, 12, & 13)	N/A	120 N•M [ 89 FT-LB ]
CYLINDER HEAD CAPSCREWS (6-CYLINDER ENGINE, LONG CAPSCREWS NUMBERS 4, 5, 12, 13, 20, & 21)	N/A	120 N•M [ 89 FT-LB ]

Piston & Connecting Rod Assembly

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

CONNECTING ROD CAPSCREWS (INITIAL)

N/A

35 N•M [ 26 FT-LB ]

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

CONNECTING ROD CAPSCREWS (B3.9, B4.5 & B5.9)	N/A	1. 45 N•M [ 33 FT-LB ] 2. TURN 90 DEGREES CLOCKWISE.
CONNECTING ROD CAPSCREWS (B4.5)	N/A	1. 25 N•M [ 221 IN-LB ] 2. TURN 60 DEGREES CLOCKWISE.

Crankshaft

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

CRANKSHAFT BEARING CAPSCREWS (INITIAL)

N/A

50 N•M [ 37 FT-LB ]

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

CRANKSHAFT BEARING CAPSCREWS (B3.9, B4.5, & B5.9 ENGINES)	N/A	1. 60 N•M [ 44 FT-LB ] 2. 90 N•M [ 66 FT-LB ] 3. TURN ALL CAPSCREWS THROUGH 90 DEGREES.
CRANKSHAFT BEARING CAPSCREWS (B4.5 ENGINES W/ PREVIOUSLY INSTALLED MAIN BEARING CAPSCREWS)	N/A	1. 60 N•M [ 44 FT-LB ] 2. 80 N•M [ 59 FT-LB ] 3. ROTATE 90 DEGREES.
CRANKSHAFT BEARING CAPSCREWS (B4.5 ENGINES W/ NEW MAIN BEARING CAPSCREWS)	N/A	1. 120 N•M [ 89 FT-LB ] 2. LOOSEN COMPLETELY. 3. 60 N•M [ 44 FT-LB ] 4. 85 N•M [ 63 FT-LB ] 5. ROTATE 120 DEGREES.

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

CRANKSHAFT BEARING CAP CAPSCREWS

N/A

176 N•M [ 130 FT-LB ]

Fuel Injection Pump (Inline)

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

FUEL INJECTION PUMP RETAINING NUT AND WASHER

N/A

10 to 15 N•M [ 89 – 133 IN-LB ]

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

FUEL INJECTION PUMP TIMING PLUG

N/A

27 N•M [ 20 FT-LB ]

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

FUEL INJECTION PLUG DRIVE NUT (“A” PUMP)	N/A	1. 85 N•M [ 63 FT-LB ]
FUEL INJECTION PLUG DRIVE NUT (P3000 & P7100)	N/A	1. 195 N•M [ 144 FT-LB ]
FUEL INJECTION PLUG DRIVE NUT (NIPPONDENSO)	N/A	1. 123 N•M [ 91 FT-LB ]

Fuel Injection Pump (Rotary)

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

FUEL INJECTION PUMP LOCK SCREW (CAV DPA PUMP AND DELPHI DP210)

N/A

7 N•M [ 62 IN-LB ]

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

FUEL INJECTION PUMP LOCK SCREW (STANADYNE DB4)

N/A

12 N•M [ 106 IN-LB ]

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

FUEL INJECTION PUMP LOCK SCREW (BOSCH VE)	N/A	30 N•M [ 22 FT-LB ]
FUEL INJECTION PUMP LOCK SCREW (BOSCH VE, RGT ENGINE)	N/A	40 N•M [ 22 FT-LB ]

Rocker Level

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

ROCKER LEVER PEDESTAL MOUNTING CAPSCREWS

N/A

36 N•M [ 27 FT-LB ]

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

ROCKER LEVER PEDESTAL CAPSCREWS

8MM

24 N•M [ 18 FT-LB ]

 

Oil Pump

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]

OIL PUMP CAPSCREWS (INITIAL)	N/A	8 N•M [ 70 IN-LB ]
OIL PUMP CAPSCREWS (FINAL)	N/A	24 N•M [ 212 IN-LB ]