Quantcast 3-5.  TEST ENGINE COMPRESSION PRESSURE.

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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 I. Install camshaft, timing gears, and oil slinger, refer to paragraph 3-40.3. m. Time all gears Top Dead Center (TDC), No.  1 cylinder on compression stroke. n. Install timing gear cover (with new front seal), refer to paragraph 3-39.3. o. Install oil pan, refer to paragraph 3-20.3. p. Install oil pressure regulating valve, refer to paragraph 3-17.3. q. Install cam followers in the same sequence as removed, refer to paragraph 3-34. r. Install cylinder head gasket, cylinder head, pushrods, and rocker arm assembly, refer to paragraphs 3-34.7 and 3-33.5. s. Install starter, refer to paragraph 3-12.7. t. Install injection nozzles (with new seals) and injection lines, refer to paragraph 3-29.4. u. Install fuel filter, fuel supply pump, and fuel lines, refer to paragraphs 3-24.4.  and 3-26.3. v. Install engine standard flow oil cooler, new oil filter, and dipstick, refer to paragraphs 3-16.3.  and 3-17.2.  (Never clean or reuse a contaminated engine oil cooler.  Install a new one.) w. Install water manifold/thermostat housing with thermostat, refer to paragraph 3-9.4. x. Install exhaust manifold and turbocharger, refer to paragraphs 3-14.3.  and 3-13.4.  Prelube the turbocharger. y. Install oil cooler piping, water pump, and hoses, refer to paragraph 3-10.4. z. Install crankshaft pulley, refer to paragraph 3-38.3. aa. Install battery charging alternator, fan, and fan belt, refer to paragraph 3-11.6. ab. Adjust valves, refer to paragraph 3-32.1. ac. Install valve cover, refer to paragraph 3-31.2. ad. Fill engine with proper oil and coolant, refer to end item maintenance manual. ae. Perform engine break-in and perform normal standard performance checks. 3-5.  TEST ENGINE COMPRESSION PRESSURE. NOTE Before   beginning   test,   ensure   that   batteries   are   fully   charged   and   injection   nozzle   area   is thoroughly cleaned. a. Run engine to bring up to normal operating temperature.  (From a cold start, operate engine 10 to 15 minutes at slow idle.) b. Remove fuel injection nozzles, refer to paragraph 3-29.1. c. Install adapter (JT01679) with O-ring in injection nozzle bore.  Use holding clamp (JT02017) to hold adapter in position.  Install hold down screw in clamp and tighten screw to 27 ft-lbs (37 Nm).  Attach test gage (JT01 682) to adapter. d. Refer  to  end  item  maintenance  manual,  and  using  DEAD  CRANK  switch,  (or  other  applicable  device),  turn crankshaft for 10 to 15 seconds with starter (150 rpm minimum cranking speed).  Record pressure reading. e. Compare readings from all cylinders. f. Compression  pressure  must  be  350  psi  (2400  kPa)  minimum.   The  difference  between  the  highest  and  lowest cylinder must be less than 50 psi (350 kPa). g. If pressure is much lower than shown, remove gage and apply oil to ring area of piston through injection nozzle bore.  Do not use too much oil.  Do not get oil on the valves. h. Test  compression  again.    If  pressure  is  high,  worn  or  stuck  rings  are  indicated.    If  pressure  is  still  low,  it  is possible that valves are worn or sticking. 3-18


 


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