M11 Series Engines – Engine Difficult to Start or Will Not Start (Exhaust Smoke)

Symptom Tree  t043

This is symptom tree t043
Cause Correction

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the Troubleshooting and Repair Manual CELECT™
Plus System, Bulletin 3666130, or the Troubleshooting and Repair Manual CELECT™ Electronic Control System L10, M11, and N14 Engines, Bulletin 3666084.

 

Cranking fuel pressure at the fuel pump is below specification

Check the fuel pressure. Refer to Procedure 005-011. If fuel pressure is low, refer to the Cranking Fuel Pressure is Low symptom tree.

 

Fuel drillings in the cylinder head are plugged

Check for a plastic fuel passage plug blocking the fuel supply to the injectors. Refer to Procedure 002-004.

 

Fuel supply line or passage restriction between the fuel pump and the injectors

Check the fuel supply line or passage for sharp bends or restriction. Procedure 002-004

 

Air in the fuel system

Check for air in the fuel system. Refer to Procedure 006-003.

 

Engine cranking speed is too slow

Check the engine cranking speed with a handheld tachometer or electronic service tool. If the cranking speed is slower than 150 rpm, refer to the Engine Will Not Crank or Cranks Slowly (Air Starter) or the Engine Will Not Crank or Cranks Slowly (Electric Starter) symptom tree..

 

Fuel grade is not correct for the application or the fuel quality is poor

Operate the engine from a tank of high-quality fuel. Refer to Fuel for Cummins Engines, Bulletin 3379001.

 

Starting aid is necessary for cold weather or starting aid is malfunctioning

Check for the correct operation of the starting aid. Refer to the manufacturer’s instructions. Refer to Operation of Diesel Engines in Cold Climates, Bulletin 3379001.

 

Air intake system restriction is above specification

Inspect the air intake system for restriction. Clean or replace filter and inlet piping as necessary. Refer to Procedure 010-031.

 

PT fuel pump AFC operation is malfunctioning or pump is not calibrated correctly

Remove the PT® fuel pump and check the calibration. Check the AFC for proper operation. Refer to the PT Fuel Pump Rebuilding and Calibration Instructions, Bulletin 3379084.

 

Overhead adjustments are not correct

Measure and adjust the overhead settings. Refer to Procedure 003-004.

 

Injector o-rings are damaged or missing

Remove and check the injectors. Replace the injector o-rings. Refer to Procedure 006-026.

 

Injector is malfunctioning (PT/STC)

Remove and check the injectors. Replace injectors as necessary. Refer to Procedure 006-026.

 

Injector is malfunctioning (CELECT™ and CELECT™ Plus)

Perform the automated cylinder performance test. Replace injectors as necessary. Refer to Procedures 006-005 and006-026.

 

Engine components are not correct

Compare the Control Parts List (CPL) to the engine components. Replace components that do not meet CPL requirements. Refer to the Control Parts List, Bulletin 3379133.

 

Camshaft end clearance is excessive

Check the camshaft end clearance. Refer to Procedure 001-065.

 
Last Modified:  05-Jan-2004