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#1776254 - 05/27/09 03:25 PM A sad day: rear main engine seal leak
Seffywuff Offline
Rookie

Registered: 04/14/08
Posts: 51
Loc: Oklahoma City
I decided to get under my car today and try to find out where my oil leaking was coming from. I only go through about half a quart per oil change, so I was never very concerned. I'm pretty sure it's the rear main seal. It's coming form a small gap from where I believe the engine and transmission meet. It's right above a metal bar who's function I am unaware of, but which goes from left to right across the vehicle, as does the slot where the oil is coming from.

I hear you have to either pull the engine or transmission to get at the rear main, so I think it'd probably be best just to let it leak until I get the transmission rebuilt. It lasted 135 thousand miles, so I guess it's not too bad, though, I don't know exactly how long it's been leaking. Should I bother with any of those seal repair additives, or just let it go?

Thanks for reading.
_________________________
1987 Grand Marquis 2 door, 110k

Stock 1989 LTD Crown Victoria. 125 thousand miles and counting. - Sold.


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#1776278 - 05/27/09 03:42 PM Re: A sad day: rear main engine seal leak [Re: Seffywuff]
JeffBoudah Offline

Poobah

Registered: 06/05/03
Posts: 8205
Loc: Holland,MI
Check the rear intake manifold lower gasket. This has a tendency to blow out over the years, making it look suspiciously like a rear main leak. Run your hand back along as if you were attempting to change out the PCV valve, and see if the back of the block is covered in oil above the rear main.
_________________________


1979 LTD 2-Door, 64k miles, Mint
2003 Explorer XLT 155k miles, bone stock and staying that way... maybe

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#1776348 - 05/27/09 05:05 PM Re: A sad day: rear main engine seal leak [Re: JeffBoudah]
mrltd Offline
Over the Hill

Registered: 01/09/03
Posts: 1351
Loc: MD
more than likely a large part of it is the valve covers and/or intake manifold. Oil leaks are also made worse by non functioning PCV systems. The usual culprit with the PCV is the screen underneath it. (lots of posts on the PCV screen)

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#1776386 - 05/27/09 06:52 PM Re: A sad day: rear main engine seal leak [Re: mrltd]
TheBlunderbuss Offline
Over the Hill

Registered: 02/24/06
Posts: 1506
Loc: CHAMPAIGN, IL
Recap the other possibilities: Upper intake manifold gaskets, valve cover gaskets, PCV valve/seating area, or oil pan gasket. Fear not!

Quick rundown of the screen: Often called a "crankcase breather filter," this will run you from $3-7 and could be had at Autozone.
Extraction is easy. It involves a wood screw of at least 6" so you can grip it. You don't need much thread on it. $1 at hardware stores.
One thread is really all you need to screw into the mesh, and the whole thing should slide out.
Install the new one by pushing it in with the PCV grommet.
_________________________
02/88 LTD Crown Victoria - 860 miles (hehe)
Don't forget that Throttle valve cable clip update!

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#1777563 - 05/28/09 09:23 PM Re: A sad day: rear main engine seal leak [Re: TheBlunderbuss]
Unforgiven Offline
Over the Hill

Registered: 01/29/02
Posts: 2098
Loc: West Tennessee
If it is the back of the intake its really not hard at all to fix... As long as you have the tool to disconnect the fuel line... I had mine done in my driveway in an afternoon on my 87.
_________________________
-Nathan-

"How can you find your fortune if you can't find yourself?"

Stock 1997 P71

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#1778080 - 05/29/09 12:21 PM Re: A sad day: rear main engine seal leak [Re: Unforgiven]
Dave58 Offline
n00b

Registered: 09/08/08
Posts: 37
Loc: Colorado, USA
My '87 CV with 5.0L had the same rear of engine drip. I replaced the valve cover gaskets and now it is perfectly dry.

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#1784964 - 06/07/09 09:08 PM Re: A sad day: rear main engine seal leak [Re: Dave58]
BillB Offline
Member

Registered: 10/11/06
Posts: 142
Loc: Revere MA
I agree with others--may not be a big problem.
my 87CV had similar oil leak.
Left side valve cover bolts were so loose did not need a ratchet to tighten--theres one bolt way in back cant see it but its there waiting to be tightened along with the other 4 or 5.

and check the right side vlv. cover too--for both L and R covers, at least two of these bolts are hard to see
_________________________
87F CV P73
91 Merc GM

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#1785247 - 06/08/09 09:34 AM Re: A sad day: rear main engine seal leak [Re: BillB]
Jeff2 Offline
Over the Hill

Registered: 08/11/08
Posts: 4302
Loc: Cincinnati, Ohio
My biggest oil leak turned out to be my oil pressure switch. The switch was cheap, but I had to buy a big socket to replace it and the socket cost more than the switch!
_________________________
1991 Crown Victoria LX - something like 147k miles (odometer gears have been broken for some time now)

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#1787826 - 06/11/09 10:13 AM Re: A sad day: rear main engine seal leak [Re: Jeff2]
88grandmarq Offline

4R70W rebuilder
Poobah

Registered: 07/10/02
Posts: 5567
Loc: North Georgia
80% of the time engine oil leaks are caused by a clogged PCV screen.

take some engine cleaner, apply it and pressure wash everything as best you can. then replace the PCV valve, grommet and screen.
If your leak continues, you can at least get a better idea where its coming from.

NOT very common for rear main seals to leak on these motors, more likly the valve covers or intake manifold gasket.
_________________________
2006 F-250 XLT SuperCab 4wd - 6.0L Diesel, 5R110W Auto, 3.73 limited slip.
Retired U.S. Border Patrol Unit# K60012

2003 Lincoln Town Car Signature - 3.27 RAR, dual exhaust and J-mod - SOLD 09/2011
89 Crown Victoria LX- HPP Box - SOLD 09/2010
88 Grand Marquis LS - The original - Totaled 5/2006

I rebuild AOD/AODE/4R70W/4R75E Transmissions, check out my Facebook page for my latest project; https://www.facebook.com/pages/North-Georgia-Transmission-Auto-Repair/348414635312478

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