Thunderbird L4-140 2.3L SOHC Turbo (1984)
Figure 4
into the vane meter (downstream) and the throttle body (upstream). The oil might get into these areas due to high crankcase pressures which build up
because of an interruption in PCV (Positive Crankcase Ventilation) flow. The interruption in flow could be caused by the location of the speed control
system vacuum nipple at the PCV closure tube fitting which connects to the air inlet elbow. (See Figures 3 and 4).
This concern can be minimized by installing a new air inlet elbow with cast-in vacuum nipples. The new elbow should be installed and vacuum
connections changed using the following procedure.
1.
Locate the compressor air inlet elbow and disconnect the crankcase vent tube (PCV) from the tube connector. (See Figures 3 and 4)
2.
Disconnect the vacuum hoses from the tube connector and then remove the tube connector from the compressor inlet elbow. Save the tube
connector for installation to the new compressor inlet elbow.
3.
Remove the air inlet hose from the inlet elbow.
