TM 10-3930-659-34 4-1. ENGINE ASSEMBLY COMPRESSION TEST (Con’t). 3. Install adapter (4) and cylinder compression tester (3) in fuel injection nozzle bore (5). WARNING Stay  clear  of  rotating  fan  blades  when cranking  engine.    Failure  to  follow  this warning may  result  in  serious  injury  to personnel. CAUTION DO  NOT  operate  starter  motor  for  more than  20  seconds  at  a  time.    Allow  two minutes for cooling before using starter motor     again     or starter motor may overheat. 4. Using ignition switch, crank engine assembly with starter motor for four revolutions of engine and note compression reading on cylinder compression tester (3). 5. Remove cylinder compression tester (3) and adapter (4) from fuel injection nozzle bore (5). 6. Repeat steps 3 through 5 for remaining fuel injection nozzle bores (5).  Compression readings must be greater than 350 psi (2413 kPa) and difference between highest and lowest compression readings must be less than 50 psi (344 kPa).  If compression readings are within specification, proceed to step 9. 7. Using hand oiler, apply four squirts of lubricating oil on piston rings on cylinder being tested through fuel injection nozzle bore (5). 8. Repeat steps 3 through 5.  If compression reading is below specification, worn or sticking valves or head gasket are indicated.  If compression reading is higher than previous compression reading, worn or sticking piston rings are indicated. 9. Install fuel injection nozzles (see paragraph 4-23). 10.  Connect fuel injection pump connector (1) to connector (2). FOLLOW-ON TASKS: • Close right and left engine upper sideshields (see TM 10-3930-659-10). • Install conveyorized fork attachments on side of forklift truck (see TM 10-3930-659-20). TA708056 4-3