ENGINE TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
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For a better understanding of each system, review the appropriate section in Theory of Operation (WP 0003
N OT E
The cylinder compression test should only be used to compare cylinders of an engine. If one or more cylin-
ders vary by more than 51 psi (350 kPa), cylinder and related components may need to be replaced.
Before performing compression test, ensure these conditions exist:
Battery is in good condition (TM 9-6140-200-14).
Battery is fully charged (TM 9-6140-200-14).
Valve lash is set correctly (WP 0155 00).
Fuel transfer pump electrical connector is disconnected (WP 0038 00).
Install cylinder compression tester in hole for fuel injector nozzle.
Operate starting motor to turn engine (TM 5-3805-290-10). Record maximum pressure indicated on compression gage.
Repeat steps 2 and 3 for all cylinders.
If one or more cylinders vary by more than 51 psi (350 kPa), replace engine (WP 0145 00).
ENGINE OIL PRESSURE TEST
Use lubricating oil for this test. Refer to Preventive Maintenance Checks and Services (PMCS) (WP 0020 00) for oil rec-
ommendations for normal operation of machine.
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Engine oil pressure varies with engine speed. As engine speed increases, engine oil pressure increases up to
minimum of 29 psi (200 kPa).
Record engine oil pressure readings when engine is at operating temperature of 212°F (100°C) from MSD. Minimum
engine oil pressure at high idle is 29 psi (200 kPa). Minimum engine oil pressure at low idle is 14.5 psi (100.0 kPa).
Disconnect MSD from machine (WP 0006 00).
Remove engine oil temperature sensor (WP 0066 00).
Install measuring equipment in oil pressure sensor port in engine side cover.