CONFIDENTIAL TIBU3665-00
TECHNICAL INFORMATION BULLETIN |
AUGUST 07, 2002 |
OFF-HIGHWAY TRUCKS |
797 (5YW) OFF-HIGHWAY TRUCKS |
Component Code 1071 |
SUBJECT: Possible Air Leaks At The Elbows In Engine Air Lines
Groups
PROBLEM:
There may be wear on the elbows (1) and (2) in the air lines groups on the engine in these trucks. Illustrations 1 and 2 show a typical air lines group. This wear may result in an air leak. The air leak could cause a loss of inlet manifold pressure. This could result in a loss of engine power. The air leak may allow unfiltered air to enter the air intake system of the engine. This may result in accelerated wear of engine components.
SOLUTION:
A production fix for this problem will not be available until 2003. Until the production fix is available, the following Steps should be taken:
- Clean and inspect the joints at each end of elbows (1) and (2). If excessive wear is evident, replace the elbow.
- Replace the seals at each end of elbows (1) and (2) with new 6V-3917 O-Ring Seals (3). Four new O-ring seals are required for each elbow.
- After elbows (1) and (2) are installed, apply a of bead 8T-9013 Red RTV High Temperature Sealant (X) to the joint at each end of elbows (1) and (2).
- Install the retainers and brackets where applicable.
- At each Preventative Maintenance inspection, check the joints where the sealant was applied. Check for cracking or degradation of the sealant. Reapply the sealant if necessary.
ILLUSTRATION 1
RIGHT SIDE VIEW OF TYPICAL AIL LINES GROUP
(1) Typical elbow. (2) Typical elbow. (3) 6V-3917 O-Ring Seal.
(A) Air Inlet Elbow. (B) Turbocharger. (C) Aftercooler.
(X) Location for bead of 8T-9013 Red RTV High Temperature Sealant.
ILLUSTRATION 2
FRONT VIEW OF TYPICAL AIR LINES GROUP
(1) Typical elbow. (2) Typical elbow. (3) 6V-3917 O-Ring Seal.
(A) Air Inlet Elbow. (B) Turbocharger. (C) Aftercooler.
(X) Location for bead of 8T-9013 Red RTV High Temperature Sealant.
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