Detroit Diesel MBE 4000 Service Manual page 377

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5. Check all the test values for the main valve listed in Table 4-5. If any of the values is
not met, replace the thermostat.
Description
Main Valve Starts To Open
Main Valve Fully Open
Main Valve Minimum Lift
Short Circuit Valve Fully Closed
Short Circuit Valve Minimum Lift
Table 4-5
[a] At the temperature of 185 F (85 C), check that the main valve has started to open.
[b] At the opening temperature of 203 F (95 C), check that the main valve is fully open.
[c] Check the minimum lift of the main valve at the opening temperature.
6. Check all the test values for the short circuit valve listed in Table 4-5. If any of the values
is not met, replace the thermostat.
[a] At the temperature of 198 F (92 C), check that the short circuit valve is fully closed.
[b] Check the minimum lift of the short circuit valve at the closing temperature.
7. Install the original or replacement thermostat(s), as necessary, the upper coolant hose inlet,
and O-ring(s) on the coolant pump, as removed.
8. Fill the engine with coolant, as removed, and check for leaks and proper operation.
All information subject to change without notice.
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Temperature
177 to 185 F (81 to 85 C)
203 F (95 C)
—
198 F (92 C)
—
Thermostat Test Values
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MBE 4000 SERVICE MANUAL
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Distance mm (inch)
—
—
8 mm (0.3 inch)
—
6 to 7.5 mm (0.24 to 0.295 inch)
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