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 TM 55-1905-223-24-5
NOTE
To prevent permanent cracking motor damage, do not crank engine for more
than 30 seconds continuously. If engine does not start within first 30 seconds,
wait 1 to 2 minutes before cranking.
(5) Run engine for 5 minutes and turn engine off.
(6) Wait 5 minutes and check oil level. Add as required.
CAUTION
Never operate the engine with oil level below the low level mark (L), or above
the high level mark (H).
b.
External Leaks. Check for evidence of external oil leakage. Secure capscrews, fittings and
connections, and replace gaskets and O-rings as necessary to correct. Check oil dipstick and filler
tube caps; see that they are secure.
2-8. Engine Run-In. After each run-in step has been completed, carefully inspect the engine for fuel, oil, water,
air, or exhaust leaks and correct as necessary.
a. Engine Dynamometer Run-In Schedule.
(1) 1200 RPM and 25% of rated load until water temperature reaches 160 (71 ).
F
C
(2) 1200 RPM and 40% of rated load for 2 minutes.
(3) 1600 RPM and 65% of rated load for 5 minutes.
(5) Rated speed and full load for 4 minutes.
CAUTION
Do not stop the engine immediately after the last run-in step is completed.
Serious engine damage can result.
b. Checks During Run-In. During engine run-in, make the following checks frequently.
(1) Oil Pressure. Pressure must not change while the engine is operating at a given RPM.
(a) Oil pressure should be 15 psi at idle speed.
(b) Oil pressure should be 50-70 psi at rated speed.
2-5
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