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Super Moderator
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Leak from rear main seal
I just started up the new 3.2 Short stroke that I just completed and got a fairly substantial puddle of oil from the rear main crankshaft seal area. Enough that is clearly under pressure (a light stream, more than a drip)
Since it is under pressure, I'm assuming the failure is the seal itself and not the o-ring yes? (After looking at an old nose bearing, it doesn't look like the o-ring seals the pressurized oil......rather it seals in the case oil. Is this logical?
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Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
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Author of "101 Projects"
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Yes it is. Your seal might have gotten pinched on the install. It's a relatively easy fix though...
-Wayne
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Wayne R. Dempsey, Founder, Pelican Parts Inc., and Author of: 101 Projects for Your BMW 3-Series • 101 Projects for Your Porsche 911 • How to Rebuild & Modify Porsche 911 Engines • 101 Projects for Your Porsche Boxster & Cayman • 101 Projects for Your Porsche 996 / 997 • SPEED READ: Porsche 911 Check out our new site: Dempsey Motorsports |
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Super Moderator
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Thanks Wayne... I am hoping that it's just that seal or the layshaft cover gasket. Don't want to split the case again. Simple enough to drop the back of the motor down and fit a new one.
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Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,310
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Technically, that's a front seal even though it is in the rear of the car. It's the front of the engine. Sorry for being so picky.
I too hope you can fix this leak without splitting the case.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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Super Moderator
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Front seal? Why would that be the front?!
Thanks for the well wishes... I've got the suspension completely rebuilt/refurbished, motor should be bearly done... Just need to take care of the bodywork now...
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Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
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Registered
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Quote:
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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JOT MON ABBR OTH
Join Date: Feb 2001
Location: USA
Posts: 3,238
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Chris,
Partial engine drop and a new pully seal are fairly easy, heck I even did that successfully ;-) You might want to run an emery cloth around the lip to ensure there are no notches that could tear the new seal.
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David '83 SC Targa (sold ![]() '15 F250 Gas (Her Baby) '95 993 (sold ![]() I don't take scalps. I'm civilized like white man now, I shoot man in back. |
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Super Moderator
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I'm not worried about that seal and the work... Can do the whole job in less than an hour. With the wide open race motor compartments I can do a clutch pull and replace in 2 hours by myself.
![]() My biggest concern was the o-ring. I was VERY careful not to pinch it and lubed it well, but of course, since that's the worst case scenario I started worrying. I'll replace the FMS today and see what happens. This is just lowering the back half of the motor... No biggie..
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Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
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Super Moderator
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FIXED!
Seal was torn ever so slightly where it rides on the crank. Thanks. 3.2L Short stroke rides again! (After 2 years and coming to be in about 15 boxes... ![]()
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Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
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