 Engine oil leaking from bell housing AGAIN!, What am I doing wrong? |
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| Pugbug |
 May 14 2005, 04:35 PM
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#1
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Member  Group: Members Posts: 449 Joined: 14-February 05 From: Victoria, BC Member No.: 3,604  |
I can't believe this is happening....When I first got the car there were a couple of oil leaks including one from the bell housing.
I hate oil leaks, so I pulled the engine, replaced the crank seal and the o ring on the flywheel and re-installed the engine. At the time I was having problems tuning the engine...(Changed the distributor) and was running it a lot in the shop. The bell housing started leaking oil again! Pulled engine...new seal again new o ring again, and to be on the safe side I took the tranny in to the local guru and had the seal replaced in that...Still dripped oil! I was never able to get the engine to run properly, so last winter I tore it down and discovered the cam and lifters were shot. Installed a Web 86 and web lifters, freshened the heads, installed yet another new main seal and o ring and I even took the fly wheel in to the shop to have the suface where the seal makes contact polished. The engine runs great now, but the oil is leaking worse than ever! What the hell am I doing wrong???? (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) Have I missed something? |
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| 9144guy |
May 14 2005, 04:40 PM
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#2
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Member Group: Members Posts: 253 Joined: 26-February 05 From: tulsa,ok Member No.: 3,672 |
whenever i build a engine i ALWAYS j/b weld those pulgs in the rear main seal area, did you check those?
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| lapuwali |
May 14 2005, 04:51 PM
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#3
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743  |
First, determine if it's gear oil or motor oil. They have VERY different odors. That way at least, you'll determine which side it's coming from: engine or gearbox. Cuts the problem in half.
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| Bleyseng |
May 14 2005, 08:28 PM
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#4
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif)
Thats the starting point to fixing leaks.... |
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| Pugbug |
May 14 2005, 09:14 PM
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#5
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Member Group: Members Posts: 449 Joined: 14-February 05 From: Victoria, BC Member No.: 3,604 |
I did the sniff test....Engine oil for sure. I will be sure to check the galley plugs, and make darned sure I have the correct seal.
It seems to me when I was assembling this engine that the seal went in too easily. Not tight around the od at all, so it may have been the wrong seal, even though I specified 914 1.8 litre the VW shop. The bright side of this is that I'm getting quick at engine removal and installations! (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) |
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| SLITS |
May 14 2005, 09:49 PM
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#6
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
Have you had the crank reground?
A seal, after many miles, can wear a groove in the crank. All the new seals in the world won't seal it if so. Check the end of the crank for a groove. Hey....I'm just guessing! |
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| Pugbug |
May 15 2005, 12:11 AM
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#7
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Member Group: Members Posts: 449 Joined: 14-February 05 From: Victoria, BC Member No.: 3,604 |
SLITS;
The seal rides on the flywheel.....not the crankshaft. I'm thinking that the oil pressure may be too high, as I blew the gasket on the oil filter on first startup. I'll put a gauge on it and check that before I go further. |
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| ClayPerrine |
May 15 2005, 07:19 AM
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#8
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Life's been good to me so far..... Group: Admin Posts: 15,459 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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If the seal goes in real easy, it may have a damaged seal opening on the back of the case. If that is the case (no pun intended) you would have to put some kind of sealer on the OD of the seal to make it stop. |
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| LvSteveH |
May 15 2005, 01:52 PM
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#9
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I put the Poor in Porsche Group: Members Posts: 1,080 Joined: 22-April 03 From: Las Vegas, Nevada Member No.: 600 |
Any chance it could be a crank case pressure problem? Do you have breathers to each of the heads? There has to be a simple answer somewhere. Good Luck getting it figured out.
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| KenH |
May 15 2005, 03:24 PM
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#10
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Senior Member Group: Members Posts: 680 Joined: 16-January 03 From: Gilroy, CA Member No.: 156 |
This time when you "part" the transmisson and engine take a few moments to see how high up on the case the leak starts.
I had a situation where I went through what you are going through and it turned out to be a leak at the Oil Pressure sensor running down the back of the case. Is this OK Cap'n Krusty ?? Ken |
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| jr91472 |
May 15 2005, 03:33 PM
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#11
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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 |
hmmm, never rebuilt and engine (yet). Can you be more specific? what plugs? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) |
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| KenH |
May 15 2005, 06:07 PM
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#12
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Senior Member Group: Members Posts: 680 Joined: 16-January 03 From: Gilroy, CA Member No.: 156 |
There are various "plugs" pressed in to case to seal holes that were made to dill the oil galleries.
These plugs can leak, and even blowout, with high oil pressure. When rebuilding it is advisable to drill out the plugs, tap the holes, and use screw-in plugs. I suppose JB Weld can be used but I like the "tap & plug" idea. Ken |
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| Allan |
May 15 2005, 06:15 PM
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#13
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Teenerless Weenie Group: Members Posts: 8,373 Joined: 5-July 04 From: Western Mesopotamia Member No.: 2,304 Region Association: Southern California |
I tapped and JB welded the plugs in.
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| jr91472 |
May 15 2005, 06:37 PM
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#14
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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 |
aha...thanks (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif) |
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| SLITS |
May 15 2005, 07:54 PM
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#15
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
I stand corrected...so check the flywheel. I can't see where high oil pressure would effect the front or rear seals as there is no direct feed...they merely seal the case...crankcase pressure (blowby) could do it though. |
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| Cap'n Krusty |
May 15 2005, 08:09 PM
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#16
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
The seal rides on the F/W, not the crank. HOWEVER, the flywheel shims can saw through the crank. Seen it before, although it would be VERY obvious when the engine was apart. My money's on the galley plugs .......... The Cap'n |
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| Pugbug |
May 16 2005, 09:42 AM
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#17
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Member Group: Members Posts: 449 Joined: 14-February 05 From: Victoria, BC Member No.: 3,604 |
Capt'n Krusty;
So....We're taking bets are we? My money is on an incorrect seal. When I installed it I screwed the seal that came in the gasket kit up. It was really tight on the OD, so I whipped down to our local VW store (Bow Wow) and got a new one. It went in really easy. Not tight on the OD at all. So place your bets gentlemen I'm heading out to the shop in about 30 minutes to drop the engine, and will report what I find. (IMG:http://www.914world.com/bbs2/html/emoticons/cool.gif) |
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| Pugbug |
May 16 2005, 02:16 PM
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#18
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Member Group: Members Posts: 449 Joined: 14-February 05 From: Victoria, BC Member No.: 3,604 |
I'm not sure, but it may not be the seal after all. There is a tiny lip that I can feel easily with a finger nail where the case halves mate at the bottom of the seal.
The galley plugs are dry, and the O ring was fairly dry as well. I think I'll use a gasket compound on the new seal, and hope for the best. You can see the uneveness at the bootom of the seal in the photo. Attached image(s) 
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| jr91472 |
Jul 6 2005, 12:28 PM
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#19
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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 |
hey Pugbug!!!!
whatever happened with your seal? Did you fix it? I am experiencing the exact same problem now. I am on my second seal. Both really tight and flush. The surface of the flywheel (where it mates the seal) seems smooth. I am starting to think about case pressure, because it only seems to leak after some highway driving. |
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| Jake Raby |
Jul 6 2005, 01:46 PM
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#20
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
never understimate the fact that over time wear can "groove" the seal seating surface of the flywheel. If this groove is deep enough to catch a finger nail on it will not seal properly and will leak oil- no matter what else you do.
What causes this is lack of oil changes and dirty oil getting trapped between the seal and the flywheel. Also many of the flywheel O rings that come in Gasket sets these days or clutch kits are pure junk. I have the real O rings with graphite coating to aid in install without tearing. You guys are really gonna like the handbook that I'm finishing up on the subject of creating a leak free engine. A whole book on ONE subject! BTW- Crankcase pressure is the biggest contributor to an oil leak. The pressure will frce oil from any possible orfice. Most of the breather boxes on the market lack enough volume to be worth a damn on our engines. I have a 1.25 Liter unit in stainless ready to market soon. Once a breather box is filled with pressure- it may as well not even be there. |
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