TORQUE SPECS FOR CUMMINS ISC, QSC, ISL, & QSL

April 10, 2023

Torque Specs for Cummins ISC, QSC, ISL, and QSL Engines: Your Complete Guide

The Cummins ISC, QSC, ISL, and QSL engines are known for their versatility and durability, powering a wide range of vehicles and equipment, from commercial trucks to marine vessels. Maintaining these engines at peak performance requires precise torque specifications for various components. In this guide, we provide the critical torque specs you need to ensure reliability, performance, and longevity in your Cummins ISC, QSC, ISL, and QSL engines.

Cylinder Head Torque Specs for Cummins ISC, QSC, ISL, and QSL Engines

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]
CYLINDER HEAD CAPSCREWS (CAPS FUEL SYSTEM) N/A 1. 50 N•M [ 37 FT-LB ]
2. 148 N•M [ 109 FT-LB ]
3. 148 N•M [ 109 FT-LB ]
4. ADVANCE 90 DEGREES.
CYLINDER HEAD CAPSCREWS (COMMON RAIL FUEL SYSTEM) N/A 1. 50 N•M [ 37 FT-LB ]
2. 150 N•M [ 111 FT-LB ]
3. LOOSEN ALL CAPSCREWS
4. 115 N•M [ 85 FT-LB ]
5. 115 N•M [ 85 FT-LB ]
6. ADVANCE 120 DEGREES.
CYLINDER HEAD CAPSCREWS (CYLINDER BLOCK SERIAL NUMBERS: 9826882 & HIGHER) N/A 1. 50 N•M [ 37 FT-LB ]
2. 150 N•M [ 111 FT-LB ]
3. LOOSEN ALL CAPSCREWS
4. 115 N•M [ 85 FT-LB ]
5. 115 N•M [ 85 FT-LB ]
6. ADVANCE 150 DEGREES.

 


Cylinder Head & related components for Cummins ISC Marine Engine

Cylinder Head & related components  for Cummins QSC Marine Engine

Cylinder Head & related component for Cummins ISL Marine Engine

Cylinder Head & related component for Cummins QSL Marine Engine

 

PISTON AND CONNECTING ROD ASSEMBLY Torque Specs for Cummins ISC, QSC, ISL, and QSL Engines

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]
ENGINES WITH CONNECTING ROD STUDS AND NUTS N/A 1. 60 N•M [ 44 FT-LB ]
2. LOOSEN CAPSCREWS
3. 70 N•M [ 52 FT-LB ]
4. ADVANCE 90 DEGREES
ENGINES WITH CONNECTING ROD CAPSCREWS N/A 1. 60 N•M [ 44 FT-LB ]
2. LOOSEN CAPSCREWS
3. 70 N•M [ 52 FT-LB ]
4. ADVANCE 60 DEGREES

 

 

Connecting Rod Assembly & related components for Cummins ISC Marine Engine

Connecting Rod Assembly & related for Cummins QSC Marine Engine

Connecting Rod Assembly & related for Cummins ISL Marine Engine

Connecting Rod Assembly & related for Cummins QSL Marine Engine

Injector Torque Specs for Cummins ISC, QSC, ISL, and QSL Engines

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]
INJECTOR HOLD DOWN CLAMP CAPSCREWS N/A 10 N•M [ 89 IN-LB ]

 

Injector & related components for Cummins ISC Marine Engine

Injector & related components  for Cummins QSC Marine Engine

Crankshaft Torque Specs for Cummins ISC, QSC, ISL, and QSL Engines

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]
MAIN BEARING CAP CAPSCREWS N/A 50 N•M [ 37 FT-LB ]

Crankshaft & related components for Cummins ISC Marine Engine

Crankshaft & related components  for Cummins QSC Marine Engine

 

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]
MAIN BEARING CAPSCREWS 128 MM [5 IN] 1. 50 N•M [ 37 FT-LB ]
2. 95 N•M [ 70 FT-LB ]
3. ROTATE 60 DEGREES
MAIN BEARING CAPSCREWS 135 MM [5.3 IN] 1. 170 N•M [ 125 FT-LB ]
2. LOOSEN ALL CAPSCREWS
3. 50 N•M [ 37 FT-LB ]
4. ROTATE 120 DEGREES

 

 

Crankshaft & related component for Cummins ISL Marine Engine

Crankshaft & related component for Cummins QSL Marine Engine

Oil Cooler Torque Specs for Cummins ISC, QSC, ISL, and QSL Engines

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]
OIL COOLER CAPSCREWS N/A 1. 15 N•M [ 11 FT-LB ]
2. 33 N•M [ 24 FT-LB ]

 

Oil Cooler & related components for Cummins ISC Marine Engine

Oil Cooler & related components  for Cummins QSC Marine Engine

Oil Cooler & related component for Cummins ISL Marine Engine

Oil Cooler & related component for Cummins QSL Marine Engine

ROCKER LEVER

PART/MATERIAL/COLOR

LENGTH

TORQUE VALUE IN NM [ FT-LB ]
ROCKER LEVER PEDESTALL CAPSCREWS N/A 65 N•M [ 48 FT-LB ]
ENGINE BRAKE OIL SUPPLY CAPSCREWS ON INTAKE ROCKER LEVERS 1 AND 4 N/A 65 N•M [ 48 FT-LB ]
EXHAUST ROCKER LEVER CAPSCREWS N/A 65 N•M [ 48 FT-LB ]
PEDESTAL CAPSCREWS IN CYLINDERS 2, 3, 5 & 6 INTAKE ROCKER PEDESTALS N/A 65 N•M [ 48 FT-LB ]
THREADED SPACERS INTO THE CYLINDER HEAD N/A 24 N•M [ 212 IN-LB ]
ROCKER LEVER LOCK NUT N/A 24 N•M [ 212 IN-LB ]

 

General Parts Catalog for ISC, QSC, ISL & QSL Marine Engines

Parts Catalog for Cummins ISC Marine Engines

Parts Catalog for Cummins QSC Marine Engines

Parts Catalog for Cummins ISL Marine Engines

Parts Catalog for Cummins QSL Marine Engines

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