GHG17 DD Medium Duty Operators Manual Table 27. Inspection of the Air Intake System Perform the following maintenance on the Air Intake System: 1. Inspect all the connections in the air system to make sure they are tight and leak-free. 2. Check all hoses and ducting for punctures, deterioration, or other damage and replace, if necessary. All information subject to change without notice. 75 DDC-SVC-MAN-0192 Copyright © 2017 DETROIT DIESEL CORPORATION Poly-V-Belt Inspection Concerns PILLING UNEVEN RIB WEAR MISALIGNMENT GRAVEL PENETRATION