PRINCIPLES OF NAVAL ENGINEERING 



adjustments, maintenance, and repair. If in- 

 spections are made regularly, many maladjust- 

 ments can be detected and corrected before a 

 serious casualty results. A planned mainte- 

 nance program will help to prevent major 

 casualties and the occurrence of many operat- 

 ing troubles. 



There may be times when service require- 

 ments interfere with a planned maintenance 

 program. In this event, routine maintenance 

 must be performed as soon as possible after 

 the specified interval of time has elapsed. 

 Necessary corrective measures should be ac- 

 complished as soon as possible; if repair jobs 

 are allowed to accumulate, the result may be 

 hurried and incomplete work. 



Since the Navy uses so many models of 

 internal combustion engines, it is impossible 

 to specify any detailed overhaul procedure that 

 is adaptable to all models. However, there are 

 several general rules which applyto all engines. 

 They are: 



1. Detailed repair procedures are listed in 

 manufacturers' instruction manuals and mainte- 

 nance pamphlets. Study the appropriate manuals 

 and pamphlets before attempting any repair 

 work. Pay particular attention to tolerances, 

 limits, and adjustments. 



2. The highest degree of cleanliness must 

 be observed in handling engine parts during 

 overhaul. 



3. Before starting repair work, be sure that 

 all required tools and replacements for known 

 defective parts are available. 



4. Detailed records of repairs should be 

 kept. Such records should include the measure- 

 ments of parts, hours in use, and new parts 

 installed. An analysis of such records will 

 indicate the hours of operation that may be 

 expected from the various engine parts. This 

 knowledge is helpful as an aid in determining 

 when a part should be renewed in order to 

 avoid a failure. 



5. Detailed information on preventive main- 

 tenance is contained in the PMS Manual for the 

 engineering department. All preventive main- 

 tenance should be accomplished in accordance 

 with the (3-M System) Planned Maintenance 

 Subsystem which is based upon the proper 

 utilization of the PMS manuals. Maintenance 



SYSTEM 



Propuls ion 



SUB-SVSTFM 



Propulsion Units 



COMPONENT 



Propulsion Diesel 

 T3 - T4 



RELATED M.R. 



R-5 



MB cesCBipTioN AFTER 750 HOURS OF OPERATION: 



1. Inspect cap screws on cylinder retainers 

 for tightness. 



2. Inspect valve tappets for proper clearance. 



M.n NUMBER 



EID R-6 



RATES 



EN2 

 BN3 



FN 



2.0 

 2.0 

 2.0 



TOTAL M/H: 



6.0 

 ELAPSED TIME; 



2.0 



SAFETY PRECAUTIONS 



1. Air starting valve wired shut and tagged, "DO NOT OPEN". 



2. Injection pump must be in stop position when jacking engine 

 by hand . 



TOOLS. PARTS MATERIALS, TEST EQUIPMENT 



1. Cover gasket H-75 PAM 10866 



2. Torque wrench 



3. Socket set 

 ^. Feeler gauge 



5. Blowdown valve wrench 



6. Jacking bar 



7. Wire and tag 



8. NAVSHIPS 341-3393 



PROCEDURE 



NOTE: To be done when engine is hot. 



1. a. Remove valve cover. 



b. Remove vibration damper cover plate. 



c. Install barring socket plate. 



d. Open blow down valves. 



e. Using torque wrench and special torquelng tool. In- 

 spect cap screws in cylinder retainer for tightness (216 

 inch pounds torque). 



f. Continue checking and adjusting torque until a com- 

 plete round is made with no movement of the screws. 

 NOTE: Working clockwise, check cap screw tightness In 

 following order 1, 5, 9, 7, 4, 2, 6, 10, 8, 3. 



2. a. With barring socket in place, jack engine as needed 

 to measure each valve tappet clearance. 



Maximum clearance 0.15 Minimum clearance .007 

 o. Remove barring socket plate and re-install the cap 

 screws in vibration damper. 



c. Re-install vibration damper cover plate. 



<i . Start engine and observe for diesel oil leak, (cent) 



LOCATION 



75.262 

 Figure 22-45.— Maintenance requirement card. 



Requirement Cards (MRCs), and schedules for 

 the accomplishment of planned maintenance 

 actions. An MRC Card is shown in figure 22- 

 45. 



It should be noted that the PMS does not 

 cover certain operating checks and inspections 

 that are required as a normal part of the regu- 

 lar watchstanding routine. For example, you 

 will not find such things as hourly pressure 

 and temperature checks or routine oil level 

 checks listed as maintenance requirements 

 under the PMS. Even though these routine 

 operating checks are not listed as PMS require- 

 ments, you must of course still perform them 

 in accordance with all applicable watchstander's 

 instructions. 



594 



