Internal oil tubes connect the oil manifold connectors to
each STC injector in the rocker housing.
Fuel pressure to the STC valve is provided by a hose (1)
between the fuel pump shut-off valve and the STC valve.
The internal spring cavity of the valve is vented to the
engine crankcase by the crankcase vent line (2) in order
to allow the plunger to cycle freely.
The oil control valve is calibrated to a specific flow and
pressure using a fuel pump test stand. Tampering with
the valve or plumbing will result in the loss of both fuel
economy and engine durability. Correct valve operation
is necessary to maintain acceptable cylinder pressures
and white smoke levels, and to assure optimum fuel
economy.
Section 5 - Fuel System Fuel System General Information
N14 Page 5-11
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