TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
Page 544 of 779
RPM Speed Engine No. 1800 3 2000 3 2200 2 2400 1 Note. The meter readings shall have precedence over the visual reading. 8-2. Crankcase and Induction System Leakage Test a. General. The engine crankcase and in- duction systems should be pressure tested to determine whether or not all connections are water-tight and airtight. The complete assem- bled engine is air-pressure tested for leaks. Leaks that are present will be indicated by the presence of air bubbles when using a soap solution on the joints as outlined below. b. Seal Openings. Seal all openings as directed in (1) through (3), below. (1) Seal exhaust outlet openings on left and right turbosuperchargers (fig. 8-2). (2) Seal air inlet openings in left and right turbosuperchargers (fig. 8-1). (3) Seal oil filler and indicator tube caps (fig. 1-2 or 1-7). c. Remove Engine Cooling Fans. Remove engine cooling vanes and cooling fans (fig. 4-34 and 4-35). The fans are removed in order to gain access to several of the points of application of the soap solution (f, below). d. Install Sleeve Spacer. Install two fan rotor hub sleeve spacers -4910-795-7952, to prevent oil seepage (fig. 4-87 ). e. Apply Air Pressure. Install a tee-type connection in crankcase breather tube (fig. 1-7). Connect manometer and air hose connection in tee. Apply air pressure and regulate air pressure to indicate ten inches of mercury (in. Hg.) on manometer. f. Apply Soap Solution. Apply soap solution to all locations listed in (1) through (10), below. (1) Air indication system and intake manifolds. (2) Exhaust system. (3) Pipe plugs in crankcase, oil pan, intake manifold, exhaust manifold and crankcase damper and oil filter housing. (4) All ventilation and vacuum line fittings. This shall include all hose connections. 8-2 Robert Bosch Visual Meter No. Light Gray 3.5 Light Gray 3.2 Haze 2.6 Clear 2.4 (5) Oil level indicator tube flange. (6) Oil filler tube flange. (7) Intercylinder preformed hoses. (8) Injector nozzle and holder (at rocker arm cover). (9) Cylinder head oil drain system. (10) Fan drive housings. g. Minor Pressure Leakage. Minor leaks should be repaired (h, below) during this test procedure and rechecked. However, some minor leaks are acceptable providing the engine passes the final acceptance test outlined below. Mark any area where leaks are evident so that the leak may be repaired. (1) Reduce air pressure to zero. (2) Remove seal (tape) from oil filler and indicator tube caps and close caps securely. (3) Pressurize system six inches of mercury (in. Hg.). (4) Test pressure loss after a five-minute (exposure) time interval must not exceed 3-1 / 2 inches mercury (in. Hg.). h. Repair of Minor Pressure Leakage. Examine marked areas (g, above) for loose hose clamps, loose attaching parts at mounting flanges, defective gaskets, or defective hoses, whichever may exist. Repair leak by replacing defective hoses or gaskets or by tightening loose hose clamps or loose mounting flange attaching parts. i. Remove Sleeve Spacer. Remove two fan rotor hub sleeve spacers - 4910-795-7952 (fig. 4- 87). j. Installation of Cooling Fans. Install engine cooling fans (fig. 4-35). k. Check Cooling Fan Clearance. Check fan blade clearance following instructions which accompany figure 4-88. l. Install Cooling Fan Vanes. Install cooling fan vanes (fig. 4-34). 8-3. Fuel and Oil System Leakage Test a. General. This test is made to determine if an oil or fuel leak exists within the engine “V” prior to and in conjunction with engine run-in