Engine Brakes Installation Manual Model T455B/C Engine Brakes For Cummins N14 Series Engines TecBrake P.O.
SECTION 2- ENGINE PREPARATION INSTALLATION MANUAL TECBRAKE MODEL T455B/C ENGINE BRAKE FOR CUMMINS N14 Plus SERIES The TecBrake T455B/C engine brake may be installed on popular versions of the Cummins N14Plus series engine. It can not be installed on the Cummins 855, 88NT, 91N14 STC, 91N14 Celect or 94N14 model engines. It should only be installed on engines whose CPL numbers are included in the Application Chart. TecBrake Model T455B/C replaces the former Model T455A/B.
1. Install the engine brake housing gaskets. Make sure that the oil supply slots align correctly with the oil supply screws in the housings. APPLICATION CHART ADJUSTING SCREW 2. Before installing the brake housings, back out the slave adjusting screws (located above the slave piston) so that the slave pistons are fully retracted (up). 2025 2026 2027 2389 2390 2391 2398 2590 2591 2592 CPL NO. 3. Place the three engine brake housings on the rocker housings.
B) Feeler Gauge Method 2. Bleed air from the engine brake housing. Accelerate the engine to about 1800 RPM then release the throttle. Quickly depress the solenoid as shown to cause the brake to operate. This process should be repeated 5-6 times on each brake assembly in order to fill the housings with lube oil. When all of the air has been removed the brake should operate immediately when the solenoid is depressed. CAUTION Wear eye protection.
Figure 4-1 4
SECTION 5 - ENGINE BRAKE MAINTENANCE Figure 5-1 3. Clean solenoid bore with solvent and wipe dry with paper towel. Be careful not to leave any lint or residue in bore that may contaminate brake hydraulic components. The engine brake is designed to be trouble free and does not require special maintenance. During regularly scheduled maintenance, or if a problem occurs, the procedures described below should be followed. CAUTION Do not remove any engine brake component while the engine running.
CAUTION 4. Reinstall solenoid valve using three new o-rings. Coat solenoid body with engine lube oil and install upper and center seal rings on solenoid body. Seat lower seal ring in bottom bore of brake. Control valve covers are under load from control valve springs. Use care when removing control valve covers to avoid injury. 5. Carefully screw in solenoid valve, using care to assure O-rings remain in position and are not twisted or "rolled". Figure 5-5 Figure 5-3 6.
. Install both control valve springs in control valve bore and install cover and retaining ring. 6. Loosen screw in spring removal tool slowly and carefully to remove the spring tension. Remove the retainer, springs and slave piston. Slave Piston 1. Remove lock nut from slave piston adjusting screw. 7. Check slave piston outside diameter ground surface for burs or defects. 2. Loosen slave piston adjusting screw until slave piston seats on bottom of bore. 8.
3. Check master piston outside diameter ground surface for nicks or burrs. Piston must slide in bore without binding. Replace if binding occurs. Check top surface of piston. Replace piston if there are cracks or pitting. 4. Clean all parts with approved solvent and lubricate with engine oil. 5. Insert piston in bore. Piston must slide in bore without binding. Replace if binding occurs. 6. Reassemble all par ts in reverse order from disassembly procedure. Figure 5-11 7.
Cummins® and Celect® are registered trademarks of Cummins Engine Co. Inc. TecBrake Inc. P.O. Box 27822 Houston, Texas 77227 ©1999 TecBrake Bulletin No.
