Posted by Owen Aaland on July 24, 2014 at 20:41:57 from (216.47.34.49):
In Reply to: 856 MCV pressure posted by Tractorcedric on July 24, 2014 at 13:12:00:
If one of those two O-rings leak air will enter the passage way until the oil level there matches the level in the transmission.
If the pickup tube seal leaks and air enters the filter cavity it does not normally cause too much trouble since the filter cavity can contain some air due to the cavity extending higher than the top of the pickup tube exit. As long as the filter itself remains completely submerged in the oil no air will enter the pump.
If the O-ring between the rear frame and center section allows air to enter the oil level in the passage on the suction side of the MCV pump will fall to the level of the transmission oil. This results in an air bubble that enters the MCV pump just after the engine starts to crank. The other thing that happens when this O-rings leaks is the the hitch pump will also draw oil back towards the filter as air enters. Since the MCV pump does not pump air very well it doesn't take a lot of air entering the circuit to keep the pump from priming.
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