Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Transmission front oil seal.... remove transmission to replace or not?

Thread Tools
 
Search this Thread
 
Old 06-15-2016, 07:16 PM
  #16  
mark kibort
Rennlist Member
Thread Starter
 
mark kibort's Avatar
 
Join Date: Feb 2003
Location: saratoga, ca
Posts: 29,946
Received 141 Likes on 60 Posts
Default

Originally Posted by GregBBRD
I did tell him about your results with Amsoil and he did try it on the track.....but I don't think he tried it on this particular test.

I'll check and see.
that would be very interesting.
didnt you have some engine dyno tests looking at the oil filling up in the heads?
I seemed to remember someone putting a plate on the valve cover and filming oil characteristics.
Old 06-15-2016, 07:53 PM
  #17  
Ducman82
 
Ducman82's Avatar
 
Join Date: Nov 2009
Location: Marysville WA
Posts: 6,981
Received 18 Likes on 11 Posts
Default

ya he had some video with he vacuum pump set up showing all the oil he sucked out of the heads at hight Rpm.
Old 12-04-2017, 11:40 AM
  #18  
GeorgeM
Rennlist Member
 
GeorgeM's Avatar
 
Join Date: May 2002
Location: Virginia Beach, VA
Posts: 1,108
Received 101 Likes on 26 Posts
Default

Originally Posted by GregBBRD
I can put Mobil 1 into freshly rebuilt tranmission and it will not leak past the seals. Anything else you want to put into one of my rebuilt transmssions is OK with me....just don't call me when it leaks.

Redline leaks 100% of the time, as do other synthetics. Draining this stuff out and putting in Mobil 1 generally will stop the leakage after a few miles....so the seal isn't actually damaged.....it just can't seem to properly seal.

New seals have a very "sharp" edge (almost like a "V", in cross section.) It seems like once this "V" gets flattened down some (wear), you can then use some of these other synthetics. Perhaps the sharp "V" of a new seal is too sharp and the "better" synthetics are so slick that the new seal can't get a "bite" on the shaft....

I don't really know why....I just know what leaks and what doesn't leak.
After about a year with M1 LS, I can say that while my tranny front seal leak hasn't stopped, it has reduced to a weep and no longer drips on the floor. Thanks to GB for another great tip!



Quick Reply: Transmission front oil seal.... remove transmission to replace or not?



All times are GMT -3. The time now is 02:28 AM.