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01-20-2014, 08:01 PM
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CC Member
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Join Date: Aug 2012
Location: Grand Rapids, MI,
MI
Cobra Make, Engine: StreetBeasts, 331 Stroker
Posts: 149
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Not Ranked
331 Rear Main Seal Leak After 1000 Miles
Hey All, my rear main seal is leaking oil into the bell housing. Thankfully I caught it before it rendered my plate and clutch useless. I have never replaced a rear main seal before and would like some directions. I'm replacing a national single piece seal.
I'm also surprised that it would go after so few miles. Engine was built by a professional engine shop in town and it appears from the outside to be a reasonably good install. I may find a bur or something once it's pulled. Appears that most of the oil is coming out of the block side but it's hard to tell.
Any advice much appreciated. |
01-20-2014, 08:53 PM
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CC Member
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Join Date: May 2009
Location: American Fork,
Ut
Cobra Make, Engine: 66 Cobra
Posts: 930
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Not Ranked
Check YouTube, "How to install a ford 302 rear main seal and sleeve."
__________________
Wayne
"Everything is alive. If you get angry at a vehicle or the trans, it won't fix until you apologize and say you are sorry." "The vehicle always knows what it is doing and what the cause of it's bad feeling is. If you ask it humbly what the problem is, it will tell you. Then you and it will both be happy."
Gil Younger
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01-21-2014, 09:04 PM
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CC Member
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Join Date: Aug 2012
Location: Grand Rapids, MI,
MI
Cobra Make, Engine: StreetBeasts, 331 Stroker
Posts: 149
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Not Ranked
Thanks Wbulk, saw the video, just wanted to know if there are any altering opinions.
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01-22-2014, 05:46 AM
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CC Member
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Join Date: Sep 2003
Location: WEST SUBURBS OF CHICAGO,
IL
Cobra Make, Engine: SPF 1454
Posts: 1,137
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Not Ranked
Are you positive it is the rear main seal?
It could be the intake.
Did you try using one of the oil dye kits to trace the leak?
__________________
CHRIS
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01-22-2014, 05:58 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Hold on before you do anything...
Did you put sealant on the flywheel bolts? The flywheel bolt holes on a 302 based engine go all the way through to the crankcase.
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01-22-2014, 09:49 PM
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CC Member
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Join Date: Aug 2012
Location: Grand Rapids, MI,
MI
Cobra Make, Engine: StreetBeasts, 331 Stroker
Posts: 149
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Not Ranked
Chris, the Dye is a very good idea, should have thought of that. Not taking the engine out of the car so doing the rear seal swap from the underside. Checked the flywheel bolts, oil pan seal, header seals, covers, and the only spot of oil appearance is on the bottom of the oil seal. All this considered (and while still not wanted to tear out a perfectly good seal) I decided tonight to pull the seal and replace it since a new one is only 20 bucks. This way I can also inspect the crank and see if it'll need a sleeve. It's my first time doing this but so far everything appears fairly simple. Fortunately it's a single piece seal. Plan is to put the new seal in with perhaps a dab of RTV where the block meets and then run a thin ring of synthetic axle grease around the inside so I'm not fitting a dry seal. Let me know if you guys thing there is an improvement to doing any of this. Thanks! |
01-22-2014, 10:15 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,453
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Not Ranked
I have tried a number of single piece seals. Without special tools, they can be a real bear to get in straight. You'll ruin a couple of seals trying to get this done.
EXCEPT the Ford seal. That one slips right just as easy as can be. IIRC, it goes in dry. no silicone, grease, or oil; but I could be wrong on that point. I wouldn't use anything except the original Ford part.
http://www.summitracing.com/parts/fm...b302/overview/
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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