Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

Rear crank seal: to replace, or not...

Rear main seal leak

  • Please log in to reply
11 replies to this topic

#1 jarl

jarl

    Subaru Fanatic!

  • Members
  • 548 posts
  • Ann Arbor area

Posted 22 May 2014 - 12:44 PM

Yesterday -finally- I pulled the engine on a new-to-me 2001 legacy. There are leaks everywhere -including head gaskets, apparently- but the one concerning me right now is -I believe- through the rear crank seal (see picture).

 

I've read here -numerous times- not to touch it because of the difficulty installing the new one, but it would be ridiculous to reinstall the engine with a know leak. So... is this a rear main seal leak that needs to be adressed, or not?

 

Also: the wrist pin cover on the left seems to be in good condition. Should I replace the o'ring preemptively?

 

Merci beaucoup!

Attached Files



#2 lmdew

lmdew

    _______

  • Members
  • 3,054 posts
  • Colorado Springs

Posted 22 May 2014 - 12:49 PM

I'd leave it.  I see that all the time, it's coming from the breather.

 

Cam if you want to. 



#3 monstaru

monstaru

    wow, relevance....

  • Members
  • 4,424 posts
  • OlyWa

Posted 22 May 2014 - 02:49 PM

THat is an easy one to do. But it is most likely the plate next to it.Take that off , clean and RTV that sucker back on!

cheers



#4 upnorthguy

upnorthguy

    New User

  • Members
  • 268 posts
  • Northern Virginia

Posted 22 May 2014 - 03:51 PM

I followed the general consensus and left my rear main seal alone as it looked OK.  People here usually say only replace it if you can see major leaking from that seal.

 

As lmdew and monstaru noted, it is usually the oil separator/breather plate to the right spewing all that oil around.  I can't tell if your plate is plastic or not.  If it is plastic, you should replace it with a new metal one (and new screws).  Photo of new plate here from beergarage.

 

When I pulled my engine a couple of weeks ago to get at this plate, my wrist pin cover also looked clear of leaks, but I went ahead and replaced o-ring.  Who knows when (if ever) I'll have the engine out again!  I needed an impact screwdriver to get those screws out.



#5 johnceggleston

johnceggleston

    Lite Master of the Subaru

  • Gold Subscribers
  • 6,403 posts
  • Virginia

Posted 22 May 2014 - 06:24 PM

DO NOT REPLACE IT.

 

there are lots of things that will kill your engine before that does.

they usually last the life of the engine.



#6 Fairtax4me

Fairtax4me

    Su bah roo'n

  • Gold Subscribers
  • 9,085 posts
  • Charlottesburg, VA

Posted 22 May 2014 - 06:41 PM

That's the separator plate leaking.
I'd replace the wrist pin cover o-ring, or remove the cover and RTV it. It's not leaking now, but it will soon.

#7 heartless

heartless

    Do YOU Subaru?

  • Members
  • 2,855 posts
  • North Central Wisconsin

Posted 23 May 2014 - 06:39 AM

agree on the separator plate leaking - lucky you, you have the cast alloy plate, remove it, clean up the mating surfaces and reseal, done deal.

you may need an impact driver to remove the screws.



#8 MilesFox

MilesFox

    Catch this Fox!

  • Members
  • 10,611 posts
  • Madison/Milwaukee, WI

Posted 23 May 2014 - 06:54 AM

THat is an easy one to do. But it is most likely the plate next to it.Take that off , clean and RTV that sucker back on!

cheers

use ultra grey or anarobic



#9 johnceggleston

johnceggleston

    Lite Master of the Subaru

  • Gold Subscribers
  • 6,403 posts
  • Virginia

Posted 23 May 2014 - 04:56 PM

after the reseal,

you do not want it to leak.

but almost as bad,

is if small pieces of sealant, or large pieces for that matter,

break off on the inside and clog oil circulation channels in your engine.

 

so seal it,

but don't over do it.



#10 jarl

jarl

    Subaru Fanatic!

  • Members
  • 548 posts
  • Ann Arbor area

Posted 07 June 2014 - 12:28 AM

I apologize for the delay in getting back. Life has kept me away for a few days... and prevented me from working on the engine :(

 

So... you agree it's only the separator plate leaking? I ask because you can see some oil around the bottom edges of the seal, and it's not clear to me how oil from the separator would get there.

I'll do the wrist pin and the separator plate for sure. I just don't want to close this thing and find the now infamous (among our family) oil-into-exhaust smell with this car too.

 

Regarding the sealant: do the anaerobic go bad after some time? I kind of know the answer, but just in case... :(
 

Attached Files



#11 heartless

heartless

    Do YOU Subaru?

  • Members
  • 2,855 posts
  • North Central Wisconsin

Posted 07 June 2014 - 07:18 AM

a minute amount of oil seepage at that seal is perfectly normal - unless there is a major leak there (yours is not major) leave it alone!

 

the oil leaking around the separator plate can get flung/blown around by the flywheel spinning, so it can get all over the place.

The separator plate is the source of your "oil-into-exhaust" issue - trust those that have been there before.

My '90 was leaking so badly from the separator plate it would literally smoke! was going thru a quart of oil every couple hundred miles. resealed the plate - left the rear main alone - and the problem was solved.



#12 jarl

jarl

    Subaru Fanatic!

  • Members
  • 548 posts
  • Ann Arbor area

Posted 07 June 2014 - 11:37 AM

Will do ;)







0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users