NG Engine Emission Certified Stationary Engine Fuel and Control System Diagnostic Service Manual (tp6717)

These NG emission-certified stationary engines usually sit in one spot running generators, pumps, or compressors, often in hot, dusty yards or plant rooms. This diagnostic service manual is what I’d keep open when the engine won’t start cleanly, hunts on speed, or fails an emissions check. For example, if the engine starts then dies under load, this book walks you through checking the fuel supply, control signals, and sensors in a sequence so you can prove what’s bad before you touch a part.

Applications & Use Cases

• Track down hard-start or no-start issues by following step-by-step checks on fuel delivery and control inputs.
• Isolate misfire or rough-running problems by comparing sensor readings and actuator response instead of guessing at components.
• Verify fuel system repairs by using the manual’s test procedures to confirm pressure, flow, and control logic are behaving correctly.
• Support emissions-related troubleshooting so you can trace a high-CO or rich-running complaint back to a specific control or fuel fault.
• Guide disassembly and reassembly of fuel and control components in a logical order to avoid leaks, misrouting, or incorrect adjustments.

FAQ

Q: Can I use this manual on a tablet or laptop in the field?

A: Yes, it’s practical to keep it digital so you can zoom diagrams and search terms while working beside the engine.

Q: Is it worth printing sections of this manual?

A: Many techs print the key diagnostic trees and test steps so they can mark readings and notes directly during troubleshooting.

Safety Note

Always lock out the prime mover and relieve fuel system pressure before opening any lines or removing components.

NG Engine Emission Certified Stationary Engine Index:

General Information …………………………………………………………………………………… 3
An overview of this Service Manual
Maintenance ……………………………………………………………………………………………… 6
General maintenance and maintenance interval information
Fuel System ……………………………………………………………………………………………. 14
An overview of the fuel system and its components
Fuel System Diagnosis ……………………………………………………………………………. 21
How to identify a general problem
Symptom Diagnostics ……………………………………………………………………………… 29
How to correct a specific problem
Electrical Section ………………………………………………………………………………………. 42
Diagnostic Scan Tool ……………………………………………………………………………. 47
Using the DST for testing and trouble shooting
Engine Wire Harness Repair …………………………………………………………………. 69
Repairing a wire harness on the vehicle
Diagnostic Trouble Codes (DTCs) ……………………………………………………….. 73
Application, schematic and DTC specific code information
Definitions ………………………………………………………………………………………………. 231
Definitions of phrases and acronyms used throughout this Service Manual

Kohler