Mecanico

Engine Brakes

Installation Manual
Model T430A Engine Brakes

For Cummins NTC/88NT Series Engines

TecBrake P.O. Box 27822 Houston, Texas 77227

INSTALLATION MANUAL
TECBRAKE MODEL T430A ENGINE BRAKE FOR CUMMINS NTC/88NT SERIES ENGINE
SECTION 1- INTRODUCTION The TecBrake T430A engine brake may be installed on popular versions of the Cummins NTC/88NT series engine. It can not beinstalled on earlier versions of the Cummins NTC series engines, which use a different cylinder head configuration. The TecBrake application chart can be used to identify the engine model and determine if the engine is approved for installation of an engine brake. The Model T430A engine brake will fit on NTC/88NT engines equipped with either Fixed Timing or Step Timing Control (STC). Earlier STC engineapplications required that the rear brake housing be connected to the Step Timing Control Valve. This is not required on the TecBrake Model T430A.

SECTION 2 - ENGINE PREPARATION

Figure 2-1 1. Thoroughly clean engine before beginning installation. Remove all engine components necessary to permit access to cylinder heads. Remove valve covers.

NOTICE The TecBrake Engine Brake is designed as adevice for slowing a vehicle, not stopping it. It is to be used in conjunction with, but not a substitute for the vehicle’s service brakes. The service brakes must be in good operating condition and used to bring the vehicle to a complete stop.
Material Required The TecBrake kit includes all of the parts required to make an installation on the most common engine configurations. Prior to makinginstallation, determine the engine CPL number to verify that the engine brake being installed is correct for the engine. The CPL number can be found on the engine identification plate that is located on the engine gear case flange. Special Tools The following special tools are required for installation: 1. Crowfoot wrench- 9/16" 2. Crowfoot wrench- 5/8" 3. Socket, extra deep- 5/8" 4. Feeler gauge-0.018" 5. STC Tappet setting tool- Cummins Part No.3822648

It is not necessary to remove the rocker lever housing to install the Model T430A engine brake.

Figure 2-2 2. Rotate engine crankshaft to proper position for making adjustments to Injector, exhaust valve, and slave pistons later on. 3. Turn crankshaft clockwise until the "A" mark on the accessory drive pulley is aligned with pointeron the gear case cover. 4 At this point, the intake and exhaust valves should be closed for cylinder No. 5 and the rocker levers should be "loose". The injector plunger for cylinder No. 3 must also be at the top of it’s travel. If it is not, turn the crankshaft another 360 degrees and realign the "A" mark with the pointer. 5. After the engine brake is installed the engine will be in position tobegin setting the injector, exhaust valve and slave piston adjusting screws.

Recommended Torque Values
Crosshead Adj. Screw locknuts Engine Brake Hold-down Nuts Rocker Housing StudsRocker Arm Adj. Screw Nuts Slave Piston Adj. Screw Nuts Fuel Pump Sw. Mtg. Brkt. Bolts25 lbft (35 N*m) 60 lbft (80 N*m) 70 lbft (95 N*m) 45 lbft (60 N*m) 25 lbft (35 N*m) 100lbin (10 N*m)

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6. Remove the rockerarm adjusting screws from the exhaust rocker levers. Retain the Cummins locknuts and screws.

Figure 2-5 12. Remove the Cummins solid rocker shaft locking screws from the cylinder heads and replace them with the hollow set screws supplied in kit. Be sure screw is below flat surface of the rocker housing when installed.

Figure 2-3 7. Move the exhaust push tube to one side; rotate the exhaustrocker lever to permit removal of Cummins crosshead. 8. Install the new TecBrake crosshead. Note that it comes with a new crosshead adjusting screw and nut. Lubricate the crosshead and guide with oil before installation. Make sure the crosshead adjusting screw is on the exhaust manifold side of the engine. 9. Adjust the crosshead by holding it down against the valve stem nearest the push tube,...