TM 10-3950-672-24-2
Engine Run-In and Test in the Chassis
B Series Engine Rating Chart
Engine
Rating
Model
Hp/RPM
ft-lb/RPM
ft-lb/RPM
4B3.9
52/1500
182/1500
- -
61/1800
177/1800
- -
64/2200
153/2200
165/1200
69/2100
172/2100
184/1200
71/2200
169/2200
184/1200
73/2300
167/2300
184/1200
76/2500
160/2500
184/1200
Engine Run-In and Test in the Chassis
Perform the run-in and test as follows:
1. Make sure that the fuel solenoid is in the "OFF" position or disconnected.
2. Crank the engine to establish oil pressure on the gauge.
Caution: Do not engage the starter for more than 30 seconds at a time, wait two (2) minutes between
engagements.
3. Reconnect the fuel solenoid if disconnected and move to the "RUN" position.
Note: Bleeding of
the fuel system may be
required to
start the engine.
4. Start the engine and run at 1000-1200 RPM for 30 minutes. Observe the oil pressure and water temperature. If
oil pressure drops below 103 kPa [15 psi], stop the engine and troubleshoot the lubrication system. If water
o
o
temperature exceeds 88 C [190 F], stop the engine and allow to cool, then repeat step 4. If overheating
continued, troubleshoot the cooling system.
5. After completing Step 4, stop the engine and inspect for leaks.
6. Restart the engine and test drive the vehicle at approximately 1/3 throttle in "Drive" or "High" gear. Periodically,
open the throttle and accelerate to governed RPM and decelerate rapidly. Repeat this procedure at least 10
times.
For industrial engines, lightly load the engine with driven accessory and accelerate as above.
The engine should be operated normally, but not at continuous high speeds and loads for the first 500 miles or 20 hours.
Occasional quick acceleration followed by quick deceleration during this period is beneficial to engine break in.
Change the oil and filters after 500 miles or 20 hours of operation. Follow oil specification recommended in the
Operator's Manual.
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