User Manual

NUMBER: 08 DD15-13 S.M. REF.: 11.1 ENGINE: EPA07 DD15 DATE: November 2008

SUBJECT: VALVE LASH ADJUSTMENTS

PUBLICATION: DDC-SVC-MAN-0002

Valve lash adjustments procedure was updated.

11.1 VALVE LASH ADJUSTMENTS

Accurate adjustment of clearance between intake and exhaust valves is important if maximum

performance and economy are to be obtained.

The valve lash on the DD15 engine must be measured a nd if necessary, adjusted at the initial period

listed in Table 1.

NOTE:

Everytime the valve lash is adjusted the engine brake lash will also need to be set. Refer to section

11.1.2 "Setting the Engin e Brake Lash.".

NOTE:

Adjust the valve lash before setting the engine brake lash.

NOTICE:

Failure to measure valve clearances at the required initia l period

and make necessary adjustments may result in gradual degrading

of engine performance and reduced fuel combustion efﬁciency.

Initial Valve Lash and Measureme n t/Ad justment Period

Adjust at 100,000 km (60,000 mi), at 300,000 km (180,000 mi), and then every 300,000 km (180,000 mi)

Table 1 Measurement/Adjustment Period

Adjust the valves as follows:

1. Steam clean the engine.

2. Disconnect the starting powe r for the engine.

3. Remove the rocker cover.

4. Bar the engine over until cylinder number one is at top dead center (TDC) compression stroke.

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NUMBER: 08 DD15-13 S.M. REF.: 11.1 ENGINE: EPA07 DD15 DATE: November 2008 SUBJECT: VALVE LASH ADJUSTMENTS PUBLICATION: DDC-SVC-MAN-0002 Valve lash adjustments procedure was updated. 11.1 VALVE LASH ADJUSTMENTS Accurate adjustment of clearance between intake and exhaust valves is important if maximum performance and economy are to be obtained. The valve lash on the DD15 engine must be measured and if necessary, adjusted at the initial period listed in Table 1.
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5. Lash intake valves one, two and four to 0.4 mm (0.016 in.). See Figure 1. 6. Lash exhaust valves one, three and five to 0.6 mm (0.024 in.). See Figure 1. 7. Bar the engine over 360° until cylinder number six is at TDC compression stroke. 1. Feeler Gauge Location between Rocker Arm and Valve Figure 1 2. Feeler Gauge Feeler Gauge 8. Lash intake valves three, five, and six to 0.4 mm (0.016 in.). See Figure 1. 9. Lash exhaust valves two, four and six to 0.6 mm (0.024 in.). See Figure 1. 10.
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ADDITIONAL SERVICE INFORMATION Additional service information is available in the Detroit Diesel DD15 Workshop Manual, (DDC-SVC-MAN-0002). The next revision to this manual will include the revised information. Detroit Diesel®, DDC®, DD15; and the spinning arrows design are registered trademarks of Detroit Diesel Corporation. © Copyright 2008 Detroit Diesel Corporation. All rights reserved. Printed in U.S.A.