NUMBER: 24–60–03
S.M. REF.: 12.2
DATE: December 2003
N3 injector setting procedures have been added to the Series 60 Service Manual.
Adjust the valves and N3 fuel injector settings as follows:
1. Disconnect starting power for engine.
2. Remove the engine valve rocker cover as outlined. Refer to section 1.6.2 for one-piece, refer to
section 1.6.3 for two-piece rocker cover, and refer to section 1.6.5 or three-piece rocker cover.
3. Insert a 3/4 in. drive breaker bar or ratchet into the square hole in the center of the crankshaft
4. Bar the engine in the direction of rotation and observe a cylinder where the injector rocker arm
is just beginning to depress the injector plunger, both the intake and exhaust valves should
be closed.
Stop turning the engine and mount a magnetic base dial indicator so you can monitor the
upward lift of travel of that injector lobe.
Set the pedestal of the dial indicator on the top of the injector cam roller. Adjust the
pedestal so it can travel the entire upward movement of the lobe.
Continue to slowly bar the engine over in the direction of rotation until the dial indicator
shows no more upward lift. The needle of the dial indicator will stop moving indicating
maximum lift.
This is the point of maximum injector roller lift, the injector can now be set.
If you rotate the engine beyond this point you will have to bar the engine over in the
opposite direction at least 1/4 turn and then bar the engine over in the direction of rotation
until maximum injector roller lift is obtained.
5. Stop engine rotation and note which cylinder this is, and follow the sequence listed in Table 1
to correctly set injector and valves.
Max. injector lobe travel on Cylinder No.
Adjust Injector on Cylinder No.
Adjust Valves on Cylinder No.
Table 1
Valve Lash and N3 Injector Setting Adjustment Sequence
6. This injector can now be set using this procedure:
Loosen the locknut on the adjusting screw at least two full turns.
Tighten the adjusting screw until the injector plunger bottoms out torque, value should
be 4.51 N·m (40 in·lbs).
Back the adjusting screw off 3/4 of a turn 0.75 mm ± 0.25 mm and tighten the locknut to
41-47 N·m (30-35 lb·ft).
The injector is now adjusted.
7. Adjust the valves on the corresponding cylinders listed in Table 1.
Never set the valves and injector of the same cylinder at the same
time. Doing this will result in engine damage.
8. To adjust the intake valves, insert a 0.203 mm (0.008 in.) feeler gage between the tip of the
valve stem and the valve button at the end of the rocker arm. See Figure 1.
1. Intake Valve
4. Locknut
2. Valve Button
5. Feeler Gage
3. Intake Rocker Arm Assembly
6. Tip of Intake Valve
Figure 1
Intake Valve Adjustment
9. Loosen the locknut, and turn the adjusting set screw until the feeler gage produces an even
smooth pull between the valve stem and valve button.
10. Torque the locknut to 41 - 47 N·m (30 - 35 lb·ft) and remove the feeler gage. Reinsert the
feeler gage to ensure that the adjustment did not change when the locknut was tightened.
Readjust as necessary.
11. The exhaust valves are adjusted the same way as the intake valves, except use a 0.508 mm
(0.020 in.) feeler gage. See Figure 2.
1. Location of Identification Groove
5. Locknut
2. Valve Button
6. Exhaust Rocker Arm Assembly
3. Allen Wrench
7. Feeler Gage
4. Adjusting Screw
8. Tip of Exhaust Valve
Figure 2
Exhaust Valve Adjustment
12. Repeat steps 4 thru 11 until all injectors and valves have been set.
13. Install the engine rocker cover. Refer to section 1.6.8 for one-piece rocker cover and refer to
section 1.6.9 for two and three piece rocker covers.
14. Reconnect starting power to the engine.
Additional service information is available in the Detroit Diesel Series 60 Service Manual, 6SE483.
The next revision to this manual will include the revised information. As a convenience to holders of
the Series 60 Service Manual, information in service manual format is attached. The page(s) may be
inserted into the manual.
Manual insert pages are numbered for insertion into the current Series 60 Service Manual dated
March 2003. Service manuals are available from authorized Detroit Diesel distributors. If this bulletin
was obtained from the Internet, service manual page(s) are available by returning to the screen “SIB
Index”, selecting attachment pages, and printing the page(s).
Detroit Diesel®, DDC®, Series 60® and the spinning arrows design are registered trademarks of Detroit Diesel Corporation.
© Copyright 2003 Detroit Diesel Corporation. All rights reserved. Printed in U.S.A.
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