termin8or Posted May 27, 2007 Share Posted May 27, 2007 I have a persistent rear main seal leak. My mechanic is stumped. The trans was dropped and seals (trans & main were both changed.) The leak is back after just 500 miles. The crank area were the seal sits seams pretty smooth and the bearings seam tight. I thought that it could be the PVC not working but that has been recently changed. HELP. It's up in the air again waiting for yet another new part and I am starting to get the feeling that my mechanic is loosing the battle. Am I missing something here? Quote Link to comment Share on other sites More sharing options...
92Lex Posted May 27, 2007 Share Posted May 27, 2007 Your mechanic is "missing something", not you. What is he/she replacing this time? How far was the seal driven in? Is the bottom end balanced? Quote Link to comment Share on other sites More sharing options...
termin8or Posted May 28, 2007 Author Share Posted May 28, 2007 My fear is that there is excessive blow-by and that's causing an increase in the crank pressure thus blowing the seal. The seal worked fine for 200 miles then started a drip again. Mechanic said that crank surface is smooth. I wonder if there is an upgraded seal for the 4.0. No the bottom end has not been balanced. I have known the mechanic for a while so I don't think he would lie to me. Quote Link to comment Share on other sites More sharing options...
92Lex Posted May 28, 2007 Share Posted May 28, 2007 Is the front crank seal also leaking? Has your mechanic checked the PCV system? Quote Link to comment Share on other sites More sharing options...
termin8or Posted May 28, 2007 Author Share Posted May 28, 2007 No front seal leak. PVC was replaced a month ago, before this leak started. Do you know anything about that EGR vacuum modulato? Quote Link to comment Share on other sites More sharing options...
92Lex Posted May 30, 2007 Share Posted May 30, 2007 What about it? Quote Link to comment Share on other sites More sharing options...
termin8or Posted May 31, 2007 Author Share Posted May 31, 2007 Never mind. On second thought the EGR won't have anything to do with an increase in crank case pressure. Quote Link to comment Share on other sites More sharing options...
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