NHTSA ID Number: 11016755
Manufacturer Communication Number: IK0900154
TSB/Document Date: 2025-04-07
Summary
Title: Cummins B6.7 Air Compressor Discharge Update Applies To: Cummins B6.7 with feature code 0004VLE AIR DRYER LOCATION Mounted Inside Engine Compartment, Right Side
Countries:
CANADA, MEXICO, UNITED
STATES
Document ID: IK0900154
Availability:
ISIS, NotSIR
Revision:
1
Major System:
Current
Language:
COOLING
Created:
Last
Modified:
11/6/2024
Author:
David
Horner
English
Other Languages: NONE
Viewed:
3/11/2025
166
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Title : Cummins B6.7 Air Compressor Discharge Update
Applies To : Cummins B6.7 with feature code 0004VLE AIR DRYER LOCATION Mounted Inside
Engine Compartment, Right Side
CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
03/11/2025 - Corrected typo on 971645R1 to 971645R91
03/10/2025 - Initial Article Release
DESCRIPTION
The copper air compressor discharge line with air dryer feature code on Cummins B6.7 Series engines may crack and leak air
due to engine vibration. This document will guide the user through the repair strategy to replace the hard copper line with a
flexible version.
SYMPTOM(s)
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
DTC/Light
n/a
Customer Observations or Concerns May Include:
-Low air pressure warning or audible air leak
-Increased time to build air pressure
-Increased compressor duty cycle
SPECIAL TOOL(s) / SOFTWARE
Description
Tool Description
Tool Number
Comments
Instructions
n/a
SERVICE PARTS INFORMATION
Quantity
Notes
Required
Kit Description
Part Number
Hose, Air Teflon, 29"
3994400C91
1
Elbow, Air Compressor Fitting (45°)
971645R91
1
Clamp, Pipe Tee, Single, Cushion (5/8")
3564290C1
If Needed
Bolt, 1/4" X 1"
25483R1
If Needed
Nut, Hexagon Type 8 1/4" Unc
25519R1
If Needed
DIAGNOSTIC STEP(s)
n/a
REPAIR STEP(s)
Figure 1: Teflon Hose Overview
Vehicle Conditions:
Vehicle parked on dry, level ground, parking brake set, transmission in Park or Neutral, Key OFF. Wheel chocks installed.
Battery disconnected. See Battery Disconnect. Hood unlatched and open. Air pressure drained from vehicle reservoirs.
1. Remove and discard air compressor outlet discharge copper tube with forward routed flex hose & 90° adaptor on air
compressor
2. Install 45° degree elbow on air compressor angled roughly 45° counter clockwise from vertical
3. Install Teflon Hose, reinstall midsupport P Clamp on stanchion support from engine, and tighten hose ends to 32 - 40 NM
(Figure 1)
4. Reinstall P Clamp orientated on the top side of fastener mounted to oil fill bracket (Figure 2 & 3)
5. If needed, bend stanchion support bracket from engine downward with hand pressure to eliminate any low midpoints in newly
installed Teflon Hose
6. Reconnect battery and close all reservoir drain valves.
Figure 1: Oil Fill Bracket Overview
A: P Clip Point on Oil Fill Bracket
Figure 1: P Clip Referance Point
A: Teflon Hose
B: P Clip Installation (Supporting Feature ABOVE Fastener)
WARRANTY INFORMATION
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):
Refer to the SRT Manual for Repair Times
OTHER RESOURCES
Master Service Information Site
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Copyright © 2025 Navistar
, Inc.
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TSB/Document ID: IK0900154
Replacement Service Bulletin Number:
MFR Communication Date: 2025-03-11
MFR Internal Campaign ID/Software Version: IK0900154
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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