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 TM 55-1905-220-14-10
5-4. MAIN PROPULSION ENGINE/MARINE GEAR - REMOVAL AND RUN-IN
MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
RUN IN (Cont)
5
Refer to Engine Test Report sample which establishes the sequence of events for the
test and run-in and to the Basic Run-In Horsepower Schedule which indicates the
speed (rpm), length of time and the brake horsepower required for each phase of the
test. Also, refer to the Operating Conditions in Chapter 3 which presents the engine
operating characteristics. These characteristics will be a guide for tracing faulty
operation or lack of power.
6
Engine governors in most cases must be reset at the maximum full-load speed
designated for the run-in. If a governor is encountered which cannot be adjusted to this
speed, a stock governor should be installed for the run-in .
7
After checking the engine performance at idle speed and being certain the engine and
dynamometer are operating properly, increase the engine speed to half speed and
apply the load indicated on the Basic Run-In Horsepower Schedule.
8
The engine should be run at this speed and load for 10 minutes to allow sufficient time
for the coolant temperature to reach the normal operating range. Record length of
time, speed, brake horsepower, coolant temperature and lubricating oil pressure on the
Engine Test Report.
9
Run the engine at each speed and rating for the length of time indicated in the Basic
Run-In Horsepower Schedule. This is the Basic Run-In. During this time engine
performance will improve as new parts begin to "seat in". Record all of the required
data.
(c)
Basic Run-In Inspection
1
While the engine is undergoing the Basic Run-In, check each item indicated in Section
"C" of the Engine Test Report. Check for fuel oil or water leaks in the rocker arm
compartment.
2
During the final portion of the Basic Run-In, the engine should be inspected for fuel oil,
lubricating oil and water leaks.
5-30
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