1018-16 Service Bulletin/Repair Instructions

10 18-16
1
10 18-16
@DETROIT.

Service Information Bulletin

SUBJECT
DATE
Symptom Diagnostics - Noise
October 2016
Additions, Revisions, or Updates

Publication Number I Title
Platform
Section Title
Change
Overhead Engine Noise
New EPA07 /10/GHG14 diagnostic procedures.
Overhead Engine Noise
GHG17 DD Platform HD rewritten procedure.
EPA07/10/

DDC-SVC-MAN-0084
GHG14 DD

Platform
DDC-SVC-MAN-0191
GHG17 DD

Platform
~DETROIT.

\g

DEMAND PERFORMANCE~
13400 Outer Drive, West, Detroit, Michigan 48239-4001

Telephone: 313-592-5000

www.demanddetroit.com
All information subject to change without notice.
10 18-16
Copyright© 2016 DETROIT DIESEL CORPORATION
3
2 Excessive Overhead Engine Noise
2
Excessive Overhead Engine Noise
Diagnose as follows:

WARNING: PERSONAL INJURY
Diesel engine exhaust and some of its constituents are known to the State of California to cause

cancer, birth defects, and other reproductive harm.

• Always start and operate an engine in a well ventilated area.

• If operating an engine in an enclosed area, vent the exhaust to the outside.

• Do not modify or tamper with the exhaust system or emission control system.
WARNING: PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level

surface, parking brake is set, and the wheels are blocked.

1. Verify the complaint.

2. Record the engine speed and coolant temperature where the noise is most noticeable.

NOTE: Small scratches and light scoring are considered normal wear for overhead valve train components

(camshaft housing, camshaft journals, camshaft lobes, rocker arm shafts, rocker arm bushings and rocker arm

rollers).
3. Shut off the engine.

WARNING: PERSONAL INJURY
To avoid injury from hot surfaces, wear protective gloves, or allow engine to cool before removing

any component.

4. Remove the rocker cover and adjust the valves and engine brakes; Refer to section "Valve Lash Adjustments".

5. Reinstall the rocker cover and air cleaner.

WARNING: PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level

surface, parking brake is set, and the wheels are blocked.
WARNING: PERSONAL INJURY
Diesel engine exhaust and some of its constituents are known to the State of California to cause

cancer, birth defects, and other reproductive harm.

• Always start and operate an engine in a well ventilated area.

• If operating an engine in an enclosed area, vent the exhaust to the outside.

• Do not modify or tamper with the exhaust system or emission control system.
4
All information subject to change without notice.
Copyright© 2016 DETROIT DIESEL CORPORATION
10 18-16
10 18-16
WARNING: PERSONAL INJURY
To avoid injury from hot surfaces, wear protective gloves, or allow engine to cool before removing

any component.

6. Start the engine again and check for the abnormal noise at the operating conditions recorded in step 2. Is the abnormal

ticking or rattling noise still present after adjusting the valves and engine brakes?

a. Yes; Go to step 7.

b. No; repairs are complete. Release the vehicle.

7. Shut off the engine.

8. Remove the rocker cover. Using a paint pen, number the exhaust and intake rocker arms with the cylinder position.

9. Remove the exhaust and intake rocker arm shaft assemblies; Refer to section "Removal of the Rocker Shaft

Assembly".
NOTE: There are three rockers on the exhaust side; the problem only affects the front two rockers. The brake

rocker arm (last in position) does not need to be inspected.
10. Inspect the first two exhaust rocker arms on each cylinder for excessive clearance between the rocker shaft and rocker

arm. Refer to section "Valve Lash Adjustments".

11 . Inspect the intake rocker arms for excessive clearance on the rocker arm shaft. Refer to section "Valve Lash

Adjustments".

NOTE: If any rocker arms have excessive clearance, the rocker arm shaft is the primary failed part (PFP) and

must be replaced along with any loose rocker arm(s). It is not necessary to replace all of the rocker arms, only the

ones with excessive clearance.
12. Do any of the rocker arms have excessive clearance?

a. Yes; replace the rocker arm shaft and any rocker arms with excessive clearance. Any rocker arms with

acceptable clearance can be reinstalled. Refer to section "Installation of the Rocker Shafts".

b. No; Go to step 13.

13. Repeat steps 10 through 12 for all cylinders. Repair as necessary.
All information subject to change without notice.
10 18-16
Copyright© 2016 DETROIT DIESEL CORPORATION
5
3 Excessive Overhead Engine Noise
3
Excessive Overhead Engine Noise
Diagnose as follows:

WARNING: PERSONAL INJURY

Diesel engine exhaust and some of its constituents are known to the State of California to cause

cancer, birth defects, and other reproductive harm.

• Always start and operate an engine in a well ventilated area.

• If operating an engine in an enclosed area, vent the exhaust to the outside.

• Do not modify or tamper with the exhaust system or emission control system.
WARNING: PERSONAL INJURY

To avoid injury before starting and running the engine, ensure the vehicle is parked on a level

surface, parking brake is set, and the wheels are blocked.
1. Verify the complaint.

2. Record the engine speed and coolant temperature where the noise is most noticeable.

NOTE: Small scratches and light scoring are considered normal wear for overhead valve train components

(camshaft housing, camshaft journals, camshaft lobes, rocker arm shafts, rocker arm bushings and rocker arm

rollers).

3. Shut off the engine.
WARNING: PERSONAL INJURY

To avoid injury from hot surfaces, wear protective gloves, or allow engine to cool before removing

any component.
4. Remove the rocker cover and adjust the valves and engine brakes; Refer to section "Setting the Valve and Engine

Brake Lash".

5. Reinstall the rocker cover and air cleaner.

WARNING: PERSONAL INJURY

To avoid injury before starting and running the engine, ensure the vehicle is parked on a level

surface, parking brake is set, and the wheels are blocked.
WARNING: PERSONAL INJURY

Diesel engine exhaust and some of its constituents are known to the State of California to cause

cancer, birth defects, and other reproductive harm.

• Always start and operate an engine in a well ventilated area.

• If operating an engine in an enclosed area, vent the exhaust to the outside.

• Do not modify or tamper with the exhaust system or emission control system.
6
All information subject to change without notice.
Copyright© 2016 DETROIT DIESEL CORPORATION
10 18-16
10 18-16
WARNING: PERSONAL INJURY
To avoid injury from hot surfaces, wear protective gloves, or allow engine to cool before removing

any component.

6. Start the engine again and check for the abnormal noise at the operating conditions recorded in step 2. Is the abnormal

ticking or rattling noise still present after adjusting the valves and engine brakes?

a. Yes; Go to step 7.

b. No; repairs are complete. Release the vehicle.

7. Shut off the engine.

8. Remove the rocker cover. Using a paint pen, number the exhaust and intake rocker arms with the cylinder position.

9. Remove the exhaust and intake rocker arm shaft assemblies; Refer to section "Removal of the Intake Rocker Shaft

Assembly" and Refer to section "Removal of the Exhaust Rocker Shaft Assembly".
NOTE: There are three rockers on the exhaust side; the problem only affects the front two rockers. The brake

rocker arm (last in position) does not need to be inspected.
10. Inspect the first two exhaust rocker arms on each cylinder for excessive clearance between the rocker shaft and rocker

arm. Refer to section "Setting the Valve and Engine Brake Lash".

11. Inspect the intake rocker arms for excessive clearance on the rocker arm shaft. Refer to section "Setting the Valve and

Engine Brake Lash".

NOTE: If any rocker arms have excessive clearance, the rocker arm shaft is the primary failed part (PFP) and

must be replaced along with any loose rocker arm(s). It is not necessary to replace all of the rocker arms, only the

ones with excessive clearance.
12. Do any of the rocker arms have excessive clearance?

a. Yes; replace the rocker arm shaft and any rocker arms with excessive clearance. Any rocker arms with

acceptable clearance can be reinstalled. Refer to section "Installation of the Intake Rocker Shaft Assembly" and

Refer to section "Installation of the Exhaust Rocker Shaft Assembly".

b. No; Go to step 13.

13. Repeat steps 10 through 12 for all cylinders. Repair as necessary.
All information subject to change without notice.
10 18-16
Copyright© 2016 DETROIT DIESEL CORPORATION
7

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