c4 transmission masive pump seal leak - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-22-2012, 05:08 PM
M1G M1G is offline
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c4 transmission masive pump seal leak

I was driving [77 bronco c4 auto]with no problems then most of the fluid puked out the pump seal, i replaced the seal with no problem filled it and started it up and it puked up most of the fluid again.The old seal looked fine and there was no groove on the torque converter. it would be a great help if some one had a answer as this is my daily driver and im finding it hard to carry heavy loads on my back.

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Old 01-22-2012, 09:34 PM
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Moving to Transmission forum.

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Old 01-22-2012, 10:06 PM
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Two things come to mind.
1.) Did you lube the new seal when you installed it? (Been there, done that)
2.) Have a look at the dowel holes on the bellhousing to make sure they haven't oblonged. (Again ... been there )

Oblonged dowel holes will allow the trans to shift with engine torque ... causing the TC to run off-center to the pump. This results in rapid wear of both the front pump bushing and the seal.
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Old 01-23-2012, 04:08 AM
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A plugged transmission vent will cause oil to puke out the front and/or rear seals. Vent is located on the top front of the tail housing from 1970 and up.
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Old 01-23-2012, 01:23 PM
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did you check to make sure the pump bushing hasnt "walked" forward closer to the seal? there should be a gap between the seal and the pump bushing.
how did the hub on the converter look? nice and smooth?
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Old 01-23-2012, 07:39 PM
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I lubed the seal ,in fact the old seal looked fine, there was some polishing on the converter from the seal but no wear. the dowels are tight. the vent tube could be pluged i just rebuilt the transfer case a month prior to this and something could have happend . The pump bushing could be it to I will check the vent and if thats good i will drop it and check the bushing ,and flush out the lines.I hope one of these works I dont want it to be something internal,thanks your advice is much appreciated.
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Old 01-23-2012, 08:26 PM
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The converter hub or the weld on the hub may be cracked too.
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Old 01-23-2012, 10:05 PM
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i looked for obvious cracks, found none, but someone suggested the governor.
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Old 01-24-2012, 05:17 AM
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Quote:
Originally Posted by M1G
i looked for obvious cracks, found none, but someone suggested the governor.
That person is incorrect. The governor will not cause fluid out the front seal or the seal to blow out.

With out a proper bench pressure check on the converter for leaks, I would not rule it out. You need have the pump bushing and related area verified to be in good condition.

Good luck
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