Rear Main Seal Leak, Or Not.. |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Rear Main Seal Leak, Or Not.. |
Olympic 914 |
Mar 29 2018, 01:57 PM
Post
#1
|
Group: Members Posts: 1,662 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
Noticed a couple drips under the engine, and it didn't smell like trans fluid. So I of course suspected a rear main seal leak. Now this engine only has just over 2K miles on it from a total rebuild. and I just had it out to repair a broken rocker arm stud over the winter. I didn't remove the flywheel at that time so the seal hasn't been disturbed since being put together.
But when I pulled it apart I found the area below the seal was dry. closer inspection revealed that the oil galley plugs I installed had leaked. Definite wet on the left plug in this picture and a little oil on the far right one. I used some liquid Teflon pipe thread sealant when I put them in. I was thinking of using some of the HondaBond case sealant this time. I used that on the case halves. and it seem to be holding up okay. The seal I put in originally was a Victor Reinz seal and I ordered another before I even pulled the engine. Now I wonder if I should just leave that seal in? it only has 2K miles. OR pull it out replace it and maybe check the crank endplay again while I have it apart. I am leaning towards ... Leaving well enough alone, and just resealing the oil gallery plugs. and leaving the rear seal in there. What is your opinion ?? |
Bartlett 914 |
Mar 29 2018, 03:18 PM
Post
#2
|
Advanced Member Group: Members Posts: 2,214 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
Noticed a couple drips under the engine, and it didn't smell like trans fluid. So I of course suspected a rear main seal leak. Now this engine only has just over 2K miles on it from a total rebuild. and I just had it out to repair a broken rocker arm stud over the winter. I didn't remove the flywheel at that time so the seal hasn't been disturbed since being put together. But when I pulled it apart I found the area below the seal was dry. closer inspection revealed that the oil galley plugs I installed had leaked. Definite wet on the left plug in this picture and a little oil on the far right one. I used some liquid Teflon pipe thread sealant when I put them in. I was thinking of using some of the HondaBond case sealant this time. I used that on the case halves. and it seem to be holding up okay. The seal I put in originally was a Victor Reinz seal and I ordered another before I even pulled the engine. Now I wonder if I should just leave that seal in? it only has 2K miles. OR pull it out replace it and maybe check the crank endplay again while I have it apart. I am leaning towards ... Leaving well enough alone, and just resealing the oil gallery plugs. and leaving the rear seal in there. What is your opinion ?? Better is the evil of good enough |
Olympic 914 |
Mar 29 2018, 05:00 PM
Post
#3
|
Group: Members Posts: 1,662 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
|
TheCabinetmaker |
Mar 29 2018, 06:04 PM
Post
#4
|
I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
I use Teflon paste. Never had one leak. I won't use the vr seals either. The Sabo black is the only one I use
|
porschetub |
Mar 29 2018, 06:23 PM
Post
#5
|
Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
(IMG:style_emoticons/default/agree.gif) the VR seals are substandard put one in my six then read all the warnings,bought a Kaco and noticed a better fit going in,VR gaskets appear ok but won't go there with an RMS seal again.
Often its a price thing in this case you pay for what you get (IMG:style_emoticons/default/dry.gif) . |
Valy |
Mar 29 2018, 09:27 PM
Post
#6
|
Senior Member Group: Members Posts: 1,671 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
The plugs should be conical and self seal with a bit of sealant.
If the plugs are not conical, sealing is going to be an issue. I used the same sealant that I used for the case - bone dry. I wouldn't touch the main seal. If it's there and it seals, let it be. |
JOEPROPER |
Mar 30 2018, 05:46 AM
Post
#7
|
The answer is "no" unless you ask... Group: Members Posts: 1,184 Joined: 21-November 15 From: White Plains New York Member No.: 19,387 Region Association: North East States |
The plugs should be conical and self seal with a bit of sealant. If the plugs are not conical, sealing is going to be an issue. I used the same sealant that I used for the case - bone dry. I wouldn't touch the main seal. If it's there and it seals, let it be. (IMG:style_emoticons/default/agree.gif) |
ChrisFoley |
Mar 30 2018, 06:46 AM
Post
#8
|
I am Tangerine Racing Group: Members Posts: 7,919 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
I don't like that the pipe plugs are installed to such a shallow depth.
|
Dr Evil |
Mar 30 2018, 09:41 AM
Post
#9
|
Send me your transmission! Group: Members Posts: 22,995 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
Were those threaded with NPT or are then non tapered? That will cause issues.
Id leave the seal alone. Glad it wasn't the input shaft seal as we just messed around in that neighborhood. |
ChrisFoley |
Mar 30 2018, 11:48 AM
Post
#10
|
I am Tangerine Racing Group: Members Posts: 7,919 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
|
worn |
Mar 30 2018, 12:07 PM
Post
#11
|
can't remember Group: Members Posts: 3,149 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
|
Olympic 914 |
Mar 30 2018, 06:37 PM
Post
#12
|
Group: Members Posts: 1,662 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
Tapered thread, 3/8 NPT plugs re sealed using the Hondabond.
Ordered a Sabo RMS from GoWesty. Be here in a couple days. Also polished up the sealing surface on the flywheel with 1500 then 2500 and buffing wheel and compound. Pretty smooth now. Shit... since I'm in here I may as well change it.... |
DRPHIL914 |
Jan 23 2023, 09:18 AM
Post
#13
|
Dr. Phil Group: Members Posts: 5,760 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
Tapered thread, 3/8 NPT plugs re sealed using the Hondabond. Ordered a Sabo RMS from GoWesty. Be here in a couple days. Also polished up the sealing surface on the flywheel with 1500 then 2500 and buffing wheel and compound. Pretty smooth now. Shit... since I'm in here I may as well change it.... (IMG:style_emoticons/default/icon_bump.gif) i am bumping this to ask if you had success with this and if now 5 years later is it still dry? Phil |
914sgofast2 |
Jan 23 2023, 11:49 AM
Post
#14
|
Senior Member Group: Members Posts: 613 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None |
|
DRPHIL914 |
Jan 23 2023, 11:51 AM
Post
#15
|
Dr. Phil Group: Members Posts: 5,760 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
I use Teflon paste. Never had one leak. I won't use the vr seals either. The Sabo black is the only one I use I second the use of the black Sabo brand of rear main seal. I've been looking all over and cant find one, not on GoWesty or anywere. |
rjames |
Jan 23 2023, 02:44 PM
Post
#16
|
I'm made of metal Group: Members Posts: 3,917 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest |
I use Teflon paste. Never had one leak. I won't use the vr seals either. The Sabo black is the only one I use I second the use of the black Sabo brand of rear main seal. I've been looking all over and cant find one, not on GoWesty or anywere. According to GoWesty the Elring model is the one to use. |
DRPHIL914 |
Jan 23 2023, 07:00 PM
Post
#17
|
Dr. Phil Group: Members Posts: 5,760 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
I use Teflon paste. Never had one leak. I won't use the vr seals either. The Sabo black is the only one I use I second the use of the black Sabo brand of rear main seal. I've been looking all over and cant find one, not on GoWesty or anywere. According to GoWesty the Elring model is the one to use. i finally found the article and their most recent update in 2021 now says it’s Eherling, the SABO not as good anymore due to age and degradation of the mold used to make the seal, so it’s no longer a perfect fit like used to hope this link helps others . https://gowesty.com/blogs/article-library/f...main-seal-story Phil -EDIT: sorry just saw that you had the same link imbedded in your post too. |
914sgofast2 |
Jan 23 2023, 07:57 PM
Post
#18
|
Senior Member Group: Members Posts: 613 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None |
Now it seems that we all need to start hoarding parts made before 2020!
|
bkrantz |
Jan 23 2023, 08:21 PM
Post
#19
|
914 Guru Group: Members Posts: 7,742 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains |
And keep them in a vacuum inside a pyramid.
|
Lo-Fi Version | Time is now: 2nd May 2024 - 05:16 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |