 too much crank case pressure...., how can you tell? |
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| jr91472 |
  Jul 8 2005, 02:50 PM
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#1
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"I'm pacing myself sergeant..."  Group: Members Posts: 1,205 Joined: 2-August 04 From: McKinney, TX Member No.: 2,437  |
So a little history. I am struggling with a rear main seal that doesn't want to stop leaking oil (sounds like I am not the only one).
I am down to two possibilities (that I know of) 1. excessive wear on the flywheel hub 2. excessive case pressure Focusing on #2, how can you determine if there is too much pressure? One mechanic told me that one test is to simply place the oil filler cap on the oil fill neck (without tighting) while the car is idling. If the cap blows off = too much pressure. Anyone heard of this? Ultimately, what is the cause of excessive case pressure? and how do you fix it? sorry for all the newbie questions, but these things keep me awake at nite...... (IMG:http://www.914world.com/bbs2/html/emoticons/beer.gif) |
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| jr91472 |
Jul 10 2005, 06:29 PM
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#2
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"I'm pacing myself sergeant..." Group: Members Posts: 1,205 Joined: 2-August 04 From: McKinney, TX Member No.: 2,437 |
Basically, the oil is localized to the bell housing area only. Everywhere else is dry. It is definately NOT gear oil.
Pulled the trans and flywheel (bout a month ago), all the galley plugs are fine. Now I won't completely garantee that it is NOT the seal/case mating surface, but it looks fine. So my bet is the seal / flywheel surface. But I will have to double check that the next time the tranny is out. Yesterday, I was thumbing through Tom Wilson's book on "how to rebuild a VW engine". He clearly recommends polishing the flywheel hub with some 220 grit paper everytime this seal is replaced. wish I had read that a month ago (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) It will be a week or two before I get to it, but I will definately post my results. good luck yourself. (IMG:http://www.914world.com/bbs2/html/emoticons/beer.gif) |
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Posts in this topic
jr91472 too much crank case pressure.... Jul 8 2005, 02:50 PM
olav Doesn't crank case pressure increase with RPMs... Jul 8 2005, 03:20 PM Jakester I'm far from the resident engine guru around h... Jul 8 2005, 03:31 PM bondo Something as simple as a stuck PCV valve can cause... Jul 8 2005, 03:34 PM jr91472 Jul 9 2005, 09:06 AM Bleyseng sure, take off the oil breather/filler and inspect... Jul 9 2005, 10:09 AM jr91472 <... Jul 9 2005, 10:30 AM jr91472 duh..... http://www.914world.c... Jul 9 2005, 10:53 AM Mueller all motors are going to have crankcase pressure, f... Jul 9 2005, 11:10 AM Dr. Roger Hey JR,
Here's the quick and easy way to see ... Jul 9 2005, 12:55 PM dmenche914 I really seal for you man. that is a bad problem,... Jul 9 2005, 02:29 PM jr91472 Thanks for all the replies people... I really appr... Jul 9 2005, 04:12 PM Dr. Roger Oh, and if I may add another $.01 here....
W... Jul 9 2005, 04:56 PM echocanyons JR,
Could you explain exactly the findings that yo... Jul 9 2005, 05:57 PM
scotty b While you're in there check the mating surface... Jul 10 2005, 06:34 PM |
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