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- Page 1 Engine Brakes Installation Manual Model T346A Engine Brakes For Caterpillar 3406, 3406B And 3406C Series Engines TecBrake P.O. Box 27822 Houston, Texas 77227...
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Page 2: Section 1-Introduction
(41 N*m) SECTION 1-INTRODUCTION SECTION 2 - ENGINE PREPARATION The TecBrake T346A engine brake may be installed on Caterpillar model 3406, 3406B and 3406C series engine. These engines although similar, were produced with variations that affect the components required and the installation procedure. - Page 3 NOTICE 6. Insert timing bolt in location shown and rotate engine using the Caterpillar Turning Tool counter clockwise (looking Follow procedure specified below to set engine to from the flywheel side of the engine) until the timing bolt is cylinder No.1 T.D.C. compression. This procedure aligned with the threaded hole in the flywheel.
- Page 4 The engine is now at cylinder No. 1 top dead center 3. Install plastic plugs in open fuel lines. compression stroke. CAUTION Do not bar engine with timing pin inserted in fuel pump. Pin may be sheared off and cause engine damage.
- Page 5 2. Level the TecBrake exhaust valve bridges : Press on center of bridge with finger. Loosen adjusting screw a couple of turns to insure screw is not contacting valve stem. Turn adjusting screw clockwise until contact with the valve stem.
- Page 6 3. Place jam nuts on TecBrake exhaust rocker adjusting screws. Figure 2-21 Figure 2-19 4. Apply clean engine lube oil to the end of the TecBrake Oil Supply Adapter. 4. Install the TecBrake exhaust rocker screw in the exhaust rocker arm.
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Page 7: Section 3 - Brake Housing Installation
3. Install two TecBrake studs on each end of the rocker 1. Remove the two cylinder head bolts as shown on Figure assembly using the washer marked “A” between the head 2-25 to install TecBrake outer support bracket. of the stud and the rocker support bracket. - Page 8 4. Torque to 30 lbft (41N*M) using the Caterpillar fuel line socket wrench. NOTE Adequate clearance must be maintained between the fuel line and the TecBrake hold down stud. After torquing, a clearance of 0.125 in. (3.175mm) min. to 0.375 in. (9.525mm) max. is required. Repositioning Figure 3-5 or interchanging of fuel lines may be required to maintain the required clearance.
- Page 9 Torque hold down nuts to 60 lbft 882 N*M). Torque the CAUTION 7/16” capscrews to 60 lbft (82 N*M). Torque again the For optimum performance and to prevent engine hold down nuts to 100 lbft (135 N*M). damage make sure that correct lash is selected and care is taken in adjustment procedure.
- Page 10 Grinding bridge will reduce strength and may cause severe engine damage. Figure 3-13 6. Install the TecBrake gasket in spacer. Gasket length will have to be trimmed after assembly. Figure 3-10 2. Attach the lower cover base with the four supplier mounting studs and washers.
- Page 11 2. When engine is at low idle, condition press top of solenoid six or seven times to bleed all air trapped in the engine brake housing. Final Check NOTE Make sure there is no fuel or oil leaks and observe that all master pistons are operating.
- Page 12 7. Remove the 7/16” capscrews, washers, tubes and engine brake housing from the engine. Figure 3-20 1. Install TecBrake Mounting Washers marked “A” on studs as illustrated above. 2. Prior to installing brake housing, slave piston adjusting screws must be loosened and backed out until slave piston is seated on bottom of bore.
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Page 13: Section 4 - Electrical Installation
Contact TecBrake distributor for details. Figure 3-25 Fuel Pump Switch (External) 10. Remove the TecBrake washer marked “A” from the mounting stud as shown. Next, place the correct shim pack that corresponds with the measured gap of that particular mounting stud. Install the “A” washer on top of the laminated shim pack. -
Page 14: Section 5 - Engine Brake Maintenance
4. Tighten locknut to 5 lbft. (7 N*m). Reconnect throttle linkage. 5. TecBrake Internal switch has a double diode configuration, harness wires can be connected to either switch terminal. PEEC I Control Engines 1. - Page 15 4. Clean the oil screen and solenoid body with an approved solvent. 5. Dry solenoid with low pressure air. 6. Clean solenoid bore in brake with solvent and wipe dry with paper towel. Be careful not to leave any lint or any other residue in bore that may contaminate brake hydraulic components.
- Page 16 4. Dip control valve in engine lube oil and install in brake 6. Compress retaining ring with retaining ring pliers and housing. Control valve should slide in bore without any remove from groove in housing. binding. Replace control valve if binding occurs. 7.
- Page 17 Slave Piston Adjusting Screw Figure 5-10 1. Remove the slave piston, adjusting screw from the brake housing. 2. Check adjusting screw to be sure plunger is free to move in both directions with light force applied. Internal spring force must hold the plunger extended. Do not disassembly with new adjusting screw if defective.
- Page 18 Cat®, and Caterpillar are registered trademarks of Caterpillar Inc. Tec Brake Inc. P.O. Box 27822 Houston, Texas 77227 ©1999 Tec Brake Bulletin No. TB990107A 11/15/99...
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