TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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3. Average entrance temperature = 88° F 4. Fuel temperature = 70° F 5. Torque arm = 1.75 feet Correction Factors: 1. Dry entrance pressure (1) in inches Hg - Absolute 29.35-0 (2) = 29.35 = Correc- tion = .0067 2. Average entrance temperature 88 F (3) - Correction = .0154 3. Fuel temperature (4) - Correction = .010 4. Total correction - .0067 + .0154 + .010 = 1.0321 SAMPLE CALCULATIONS: bhp Observed Correction Net bhp 612.0 X 1.0321 = 631.65 Fan hp Fan hp@2400 rpm (Table 8-5) = 108 Corrected Gross bhp Corrected net bhp + Fan hp = 631.65 + 108 = 739.65 Corrected Gross Torque Corrected gross bhp x 5252 = Brake Specific Fuel Consumption 8-7. Quality Control lest a. General. A 50-hour quality control test shall be conducted for the purpose of determining the continued quality of the engine. b. Control Test. (1) Selection of test sample. Engines shall be selected at the rate of one per month when production is below 100 per month; or one in every 100 engines when production exceeds 100 units per month; or on curtailed production at least one every 60 days. Test engines shall be identified as to production period, examined for defects and subjected to the tests outlined in the technical manual. (2) Fifty-hour quality control test schedule. Each engine selected in accordance with sub paragraph (1), above, shall be operated, as specified in table 8-6, for 50 hours as nearly continuously as possible (a) Starting with run No. 3, an oil con- sumption reading shall be taken each one-half (½) hour when operating at 2400 rpm full load. (b) A blow-by check shall be made at 2400 rpm full load prior to runs No.'s. 3-11-15- 19 and 22. Normal reading will be 11 to 15 cubic feet per minute (CFM). Maximum per- missible blow-by is 18 cfm. The blow-by can be measured with a volumeter or gas meter between the crankcase breather tube and exhaust pipe. (c) Approximately 100 amp’s load shall be applied to the generator during the complete test. (d) Readings shall be taken every one-half (½) hour and will include all data taken on the regular test. (3) Corrections. Engine subjected to this test shall be completely disassembled and all interchangeable parts subjected to wear or stress shall be inspected. A complete report including the inspection and testing of the engine shall be submitted to the Government inspector. Should there be evidence of failure of parts requiring correction as a result of this test, the inspector shall refuse acceptance of subsequent production engines until such corrections have been made and objective evidence presented to the Government inspector. Engines subjected to this test shall be reassembled with new parts replacing those found unsatisfactory during examination. (4) Disposition of engines. After correction of all defects disclosed by the test, engine shall be reassembled, given a final run in accordance with paragraph 8-4, inspected in accordance with paragraph 8-6, and if found acceptable, shipped as a regular production engine. (5) Control test failure. Failure of a control test engine to pass any specified examination or test shall be cause for rejection of subsequent lots until satisfactory evidence is submitted to the government inspector that the faults revealed by the examination or test have been corrected. 8-12