Usage:
THIS TIB REPLACES THE JUNE 8, 1994 ENGINES TIB COMPONENT CODE 1119, 1208. DESTROY THE JUNE 8, 1994 TIB. IT WILL NOT APPEAR IN THE QUARTERLY INDEX.
Problem:
Caterpillar and Jacobs have determined, during recent field investigations of the Model 336A on the 3306C engine, that when the Jake Brake is activated, a high load is transmitted to the push rods (tubes) of the engine. This high load spike can occur randomly on any cylinder. An area of focus, at the present time, is interruptions in the electrical power supply to the engine brake during engine braking. This results in additional reactivation cycles and a potential for additional high load spikes. During the investigation, resetting the slave piston lash to 3.18 mm (.125 in) reduced the magnitude of the load spike; however, units reset to 3.18 mm (.125 in) of lash continued to have problems.
Solution:
The current recommendations is, when any 3306C engine using a Model 336A Jake Brake experiences a push tube failure, disable the Jake Brake until further notice. This is a recommendation only, and not a campaign. Customers who continue to use the Jake Brake risk additional push tube failures. Engines which have not experienced push tube failures should continue to use the retarder as before.
This is a temporary action. Caterpillar and Jacobs are continuing to work together to solve this problem. A permanent corrective action will be communicated as soon as it is fully qualified.
Continue to file claims to Caterpillar for push tube failures. Please use "5S-5918" in the part number responsible space, "push rod or tube" for the name, and "A" for the failure description code.
Please share this information with your TEPS Dealers.
COPYRIGHT 1994 CATERPILLAR ALL RIGHTS RESERVED