AI Diesel Tech
Torque Specs

Heavy-Duty Diesel Torque Spec Library

Professional-grade torque specifications for Cummins X15, PACCAR MX-13, Detroit DD15, and Volvo/Mack MP8. Includes torque values, sequences, lubrication requirements, and related fault codes.

Cummins X15PACCAR MX-13Detroit DD15Volvo/Mack MP8

Important: These torque specs are reference values for the most common configurations. Always verify against your OEM service manual for your specific engine serial number and build date. Torque-to-yield bolts must be replaced — never reused.

Cummins X15

ISX15 / X15

Injector

Injector Hold-Down Bolts

37 ft-lbs (50 Nm)View
EGR Valve

EGR Valve Mounting Bolts

18 ft-lbs (24 Nm)View
Turbo Actuator

Turbo Actuator Mounting Bolts

9 ft-lbs (12 Nm)View
High-Pressure Fuel Pump

High-Pressure Fuel Pump Bolts

18 ft-lbs (24 Nm)View
Camshaft Bearing Caps

Camshaft Bearing Cap Bolts

18 ft-lbs (24 Nm)View
Rocker Lever Assembly

Rocker Lever Assembly Bolts

28 ft-lbs (38 Nm)View

PACCAR MX-13

MX-13 / MX-11

Injector

Injector Hold-Down Bolts

22 ft-lbs (30 Nm)View
High-Pressure Fuel Pump

High-Pressure Fuel Pump Bolts

18 ft-lbs (24 Nm)View
EGR Sensor Housing

EGR Differential Pressure Sensor Housing

9 ft-lbs (12 Nm)View
Turbo Actuator

Turbo Actuator Mounting Bolts

9 ft-lbs (12 Nm)View
Valve Cover

Valve Cover Bolts

9 ft-lbs (12 Nm)View

Detroit DD15

DD13 / DD15 / DD16

Injector

Injector Hold-Down Bolts

37 ft-lbs (50 Nm)View
Camshaft Bearing Caps

Camshaft Bearing Cap Bolts

18 ft-lbs (24 Nm)View
DEF Dosing Unit

DEF Dosing Unit Mounting Bolts

18 ft-lbs (24 Nm)View
EGR Valve

EGR Valve Mounting Bolts

18 ft-lbs (24 Nm)View
Turbo Speed Sensor

Turbo Speed Sensor Housing

9 ft-lbs (12 Nm)View

Volvo/Mack MP8

D13 / MP7 / MP8

Injector

Injector Hold-Down Bolts

22 ft-lbs (30 Nm)View
Rocker Lever Assembly

Rocker Lever Assembly Bolts

28 ft-lbs (38 Nm)View
Turbo Actuator

Turbo Actuator Mounting Bolts

9 ft-lbs (12 Nm)View
EGR Valve

EGR Valve Mounting Bolts

18 ft-lbs (24 Nm)View
DPF Pressure Sensor

DPF Differential Pressure Sensor Housing

9 ft-lbs (12 Nm)View

Why Torque Specs Matter

Proper sealing — prevents exhaust gas and fluid leaks
Correct clamping force — prevents component movement
Accurate sensor readings — sensors must be seated correctly
Prevention of component damage — over-torque cracks housings
Safe operation — critical for injectors, camshafts, and turbo components
Warranty compliance — OEM torque specs are required for warranty claims

Related Resources

Sensor Location Guides

Connector pinouts, test procedures, and platform locations for every major diesel sensor.

AI Diagnostic Engine

Guided step-by-step diagnosis for any fault code — with live data interpretation.

Repair Procedures

Step-by-step repair procedures for common diesel components.

Frequently Asked Questions

Are torque specs free on AI Diesel Tech?

Yes — all torque spec pages are free and available without login.

Do torque specs vary by platform?

Yes — torque values and sequences differ between X15, MX-13, DD15, and MP8. Always use the platform-specific spec for your engine.

What are torque-to-yield bolts?

Torque-to-yield (TTY) bolts are designed to stretch slightly during installation to achieve precise clamping force. They must be replaced every time they are removed — reusing TTY bolts risks under-torque and component failure.

Does the AI Diagnostic Engine use torque specs?

Yes — when a diagnostic step requires torque verification, the AI Diagnostic Engine references the torque spec library for your specific platform.