To adjust the valves on the right cylinder, crank the
engine over one complete revolution and again line
up the mark on the flywheel and the TC mark on the
gear cover.-Then follow the adjustment given for the
valves of the left cylinder.
OIL
PRESSURE RELIEF
VALVE ADJUST-
MENT
Begin Spec D, the NH generating sets have a fixed oil
pressure bypass. Oil pressure cannot be adjusted.
Prior Spec D, adjust the engine oil pressure by means
of the slotted stud and locknut located near the
breather tube. See Figure 37. When the engine has
reached normal operating temperature, oil pressure
readings should be between 30 and 35 Ibs. To
increase oil pressure, loosen the locknut and turn the
stud inward. To decrease oil pressure, loosen the
locknut and turn the stud outward. Be sure to tighten
the locknut securely after making an adjustment. The
spring and plunger can be removed and cleaned.
Low oil pressure may indicate worn main or connec-
ting rod bearings, improper clearance atthese points,
a weak or broken bypass spring, an improperly
adjusted bypass or a defective gauge. Check the oil
pressure gauge before making any other test; it too
may be defective.
26
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