Possible Rear Main Seal Leak - Ford Mustang Forum
 
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post #1 of 8 (permalink) Old 03-15-2009 Thread Starter
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Possible Rear Main Seal Leak

Yesterday, after I backed my car out of the garage, I noticed a fairly small oily puddle on the floor or my garage. After getting semi underneath my car, I can see a small wet patch on some part of the transmission, near where it bolts up to the motor. I think it might be a main seal leak, but I'm not 100% sure.

I don't know if this could have caused it, but I was coming home the day before this happened, and I missed 3rd at about 45 and went into 1st by accident. I hit the rev limiter pretty hard, which obviously couldn't have helped.

If someone knows how I can tell for sure if its a main seal, then please let me know.

Thanks for your help.

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post #2 of 8 (permalink) Old 03-15-2009
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sounds to me like you blew the rear main seal, way too high revs = way too high oil pressure, so the seal pops out. do you see seepage where the bellhousing meets the block? only way to be sure would be to drop the tranny, remove the clutch and flywheel and inspect the seal. they are an absolute nuisance if all your replacing is that seal. you might as well save up for a clutch/flywheel/driveshaft since your going to be in there anyway.
either way, i recommend replacing that seal asap, because it can leak oil on your clutch and make it slip.

the seal is about $12, you'll need some caliper grease or similar grease, and a drift pin that is a little wider than the width of the seal. remove the old seal carefully with a pick, clean the remaining pieces of the seal out, push the new seal on by hand and then take the drift pin and tap it in, going top,bottom,left,right; listen to the sound it makes when your tapping it, when you hear a metal "clink", its tapped in all the way and your done.

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-1994 Jeep XJ 4wd, 3" lift, 31" tires.. rust in peace..
-1997 Jeep XJ 4wd, 7" lift, 35" tires, front/rear lockers

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post #3 of 8 (permalink) Old 03-15-2009
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also, put some dye in the oil. that will be a pretty good indicator. make sure you take a brake cleaner and clean all the residual oil first.

-2000 3.8L TKO600, 1.8 60ft, 8.71 @ 81mph
-1988 Jeep XJ, bone stock 2wd
-1994 Jeep XJ 4wd, 3" lift, 31" tires.. rust in peace..
-1997 Jeep XJ 4wd, 7" lift, 35" tires, front/rear lockers

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post #4 of 8 (permalink) Old 03-15-2009 Thread Starter
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Yeah, its dripping down on the bell housing. I doubt I can do this job myself, but I know its about a $700 job for a $15 part. Thanks for the help though.

1993 LX Coupe
Show: Front 18x9 Black Bullit wheels, Rear 18x10 Black Bullitt deep dish wheels, Cervini's 2.5" Cowl hood, Autometer Phantom 10K tachometer, Autometer Ultra-Lite carbon fiber FP gauge
Go: GT40P Explorer motor, Edlebrock Performer intake, AFM 4" Power Pipe, TFS Stage 1, ProForm 1.6's,Granetelli 24lb MAF, MSD Blaster Coil + distrib, Taylor Pro wires, UDP's, GT40p long tube headers, o/r 2.5" H pipe, 2.5" cat back w/ Flowmaster 10 Series mufflers, 3.73s
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post #5 of 8 (permalink) Old 03-15-2009
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Quote:
Originally Posted by 02silverstang View Post
Yeah, its dripping down on the bell housing. I doubt I can do this job myself, but I know its about a $700 job for a $15 part. Thanks for the help though.
your welcome sorry i cant help more tho.

honestly, if you can get access to a lift , a trans-jack, and some basic tools you should be able to do it yourself; its not that bad, just give yourself 7-8 hours to get it done.

-2000 3.8L TKO600, 1.8 60ft, 8.71 @ 81mph
-1988 Jeep XJ, bone stock 2wd
-1994 Jeep XJ 4wd, 3" lift, 31" tires.. rust in peace..
-1997 Jeep XJ 4wd, 7" lift, 35" tires, front/rear lockers

-Bronze Level Porsche Technician
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post #6 of 8 (permalink) Old 03-15-2009
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The tranny is light enough that one person with a jack can pull it out.

I just did mine a couple months ago and was able to put a jack under the tranny while I pulled it out. I did the same thing to put it back in, its not that hard at all.

I would also do it when you do the clutch, no sense in pulling it apart to put the old clutch back in.

You can also use the old seal to put the new one in.

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post #7 of 8 (permalink) Old 03-15-2009 Thread Starter
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The leak is fairly small, so do you think I could live with it for a while, because I wasn't planning on putting in a new clutch any time soon.

1993 LX Coupe
Show: Front 18x9 Black Bullit wheels, Rear 18x10 Black Bullitt deep dish wheels, Cervini's 2.5" Cowl hood, Autometer Phantom 10K tachometer, Autometer Ultra-Lite carbon fiber FP gauge
Go: GT40P Explorer motor, Edlebrock Performer intake, AFM 4" Power Pipe, TFS Stage 1, ProForm 1.6's,Granetelli 24lb MAF, MSD Blaster Coil + distrib, Taylor Pro wires, UDP's, GT40p long tube headers, o/r 2.5" H pipe, 2.5" cat back w/ Flowmaster 10 Series mufflers, 3.73s
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post #8 of 8 (permalink) Old 03-15-2009
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Yes, rear main seals leak all the time as long as it is not a large puddle......

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