Performing Troubleshooting Tests - Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual

2.1

PERFORMING TROUBLESHOOTING TESTS

To perform fuel troubleshooting tests on the engine:
1. Run the engine for two to three minutes at rated speed, 1800–2100 rpm.
Correct torque on the high pressure lines is critical. Incorrect
torques could result in leaks or lack of power due to restricted
fuel flow.
2. Perform a visual inspection of all fuel lines, pressure fittings, and components, including
all the fittings that connect the fuel feed and drain hoses to the fuel filter housing. Replace
any components found to be damaged or leaking. If necessary, tighten all high-pressure
fittings to 25 N·m (18 lb·ft) and all banjo bolts to 40-50 N·m (30-37 lb·ft).
3. Inspect the filter element in the fuel pre-filter. Replace if necessary.
4. Inspect the filter element in the main fuel filter. Replace if necessary.
5. Continue to run the engine until it reaches the operating temperature of approximately
82°C (180°F). When the operating temperature has been reached, shut the engine down
and go to the next step.
NOTE:
When doing these tests, be sure the temperature of the fuel in the fuel tank is no higher
than 40°C (104°F). Collect any fuel which flows out during the test. The fuel should flow
through free of bubbles.
6. Perform the fuel system troubleshooting tests and correct any problems. As indicated by
the test results, perform any follow-up tests or check troubleshooting tables, as required.
Make the necessary repairs and/or replacements. For troubleshooting tests and tables
see the following subjects:
[a] Test #1: Fuel Pressure Test. Refer to section 2.2.
[b] Test #2: Percentage of Fuel Delivery for a Smooth Idle, refer to section 2.3.
[c] Test #3: Impact Delay Time, refer to section .
[d] Test #4: Fuel Pump Driven Gear Bolt Torque, refer to section 2.4.
[e] Test #5: Leak Test,. refer to section 2.5.
7. When all the tests are completed, the test equipment removed, and all repairs/replacements
have been made, prime the fuel system.
[a] If equipped with a hand pump on the fuel/water separator, work the hand pump
until resistance is felt.
All information subject to change without notice.
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NOTICE:
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MBE 4000 DDEC VI TROUBLESHOOTING GUIDE
2-3