Operation and maintenance manual

QSB4.5 and QSB6.7 Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms Page TS-61
Smoke, Black — Excessive
Cause Correction
STEP 1
Electronic fault codes are active
.............
For instructions on how to read active fault codes,
refer to Section 1. If fault codes are active, contact
a Cummins Authorized Repair Facility.
OK
Go To Next Step
STEP 2
Air intake system restriction is above specification
.............
Check the air intake system for restriction. Clean
or replace the air filter and inlet piping as
necessary. Refer to Section 4.
OK
Go To Next Step
STEP 3
Air intake or exhaust leaks
.............
Check for loose or damaged piping connections
and missing pipe plugs. Check the turbocharger
and exhaust manifold mounting. Refer to Section
4.
OK
Go To Next Step
STEP 4
Charge air cooler is restricted or leaking
.............
Inspect the charge air cooler for air restrictions or
leaks. Refer to Section 4.
OK
Go To Next Step
STEP 5
Contact a Cummins® Authorized Repair Facility