what are signs of rear main seal leaking?

91cobra5.0 · March 9th, 2008, 06:00 PM

i have an oil leak somewere from mid back on passenger side, n o oil on cats or anything above and cant see anything below with oil on it. my heater core is bad but the hoses arent leaking inside the engine bay, so i dont think its coming from that

blue88lx · March 9th, 2008, 06:05 PM

Check the back of the intake manifold and look at the top of the bellhousing. It is a common problem on these cars. Mine is doing it, i'm just waiting to get a different intake. For the rear main, you should have oil running down the exposed bottom of the block plate.

ryans88gt · March 9th, 2008, 07:28 PM

Yeah, if you have oil running down the block plate it is usually the rear main. Sometimes it is the flywheel bolts not being sealed properly, sometimes the oil finds its way down from the top of the motor.

91cobra5.0 · March 9th, 2008, 08:11 PM

so loose flywheel bolts can cause it? or will it leak becuase the bolts arent tight enough?

FoxHoss · March 9th, 2008, 09:00 PM

the oil leak at the top behind the intake manifold, whats that all about, i think my cars got it

blue88lx · March 9th, 2008, 09:56 PM

Originally Posted by FoxHoss

the oil leak at the top behind the intake manifold, whats that all about, i think my cars got it

Just need to pull the intake manifold off. Put in new gaskets, and use rtv instead of the crappy cork gaskets on the front and back.

Tony_90fox · March 9th, 2008, 10:04 PM

yeah, those gaskets are worthless, use some of the Blue rtv and you will be set

rodthrower2.3T · March 9th, 2008, 10:19 PM

on my 89 aod car that i had you could jack it up and watch it run and once it warmed up you could see oil seep out from the back of the pan from the rear main seal, little hard to see but mine was pretty bad,

ryans88gt · March 9th, 2008, 10:49 PM

Originally Posted by 91cobra5.0

so loose flywheel bolts can cause it? or will it leak becuase the bolts arent tight enough?

On some cranks the flywheel bolts intersect the oiling for the crank. So yeah you can get oil leaking out of the threads for the flywheel bolt if you don't use the correct sealer or teflon tape.

teal89 · March 10th, 2008, 02:08 AM

Originally Posted by blue88lx

Just need to pull the intake manifold off. Put in new gaskets, and use rtv instead of the crappy cork gaskets on the front and back.

That and also check your PCV valve, if it's popping out of up a little, it will spray on the firewall as well as I had the same thing happen and I replaced that. Also if you wish, I would highly recommend you pick up another "breather filter" for your pcv valve. It's actually located directly under the pcv valve grommet and is easy to take out. You can spray the hell out of it with carb cleaner and shake dry. It'll get clogged with gunk and shit and your breather can't breath, pushing manifold pressure though anywhere possible to exit

ryans88gt · March 10th, 2008, 12:59 PM

^^^ +1, I usually take the oil screen out using a 4 inch dry wall screw. Then, holding it with a pair of vice grips, I burn all the crap off with a propane torch.

crumbie50 · March 10th, 2008, 01:31 PM

I had what I thought was a rear main seal leak in my coupe. Pulled the aod when I was doing my aod-t5 swap and noticed it wasn't the seal, but the oil pan gasket. There was a slight/small break in the gasket and oil was getting through it.

Pulled the trans on my '93 f150 truck with a 302 and had the same problem with the oil pan gasket on it.

trueblue01 · March 10th, 2008, 03:22 PM

AutoZone.com | Shopping | Parts | Product Detail - Oil Pan Gasket

Best oil pan gasket I've found yet.

blue88lx · March 10th, 2008, 09:06 PM

Originally Posted by trueblue01

AutoZone.com | Shopping | Parts | Product Detail - Oil Pan Gasket

Best oil pan gasket I've found yet.

1 pc. felpro ftw! And re-usable too!

blue88lx · March 10th, 2008, 09:12 PM

Originally Posted by teal89

That and also check your PCV valve, if it's popping out of up a little, it will spray on the firewall as well as I had the same thing happen and I replaced that. Also if you wish, I would highly recommend you pick up another "breather filter" for your pcv valve. It's actually located directly under the pcv valve grommet and is easy to take out. You can spray the hell out of it with carb cleaner and shake dry. It'll get clogged with gunk and shit and your breather can't breath, pushing manifold pressure though anywhere possible to exit

Yeah, you gotta let them breathe! The other night I get a call from a customer(SMU), a generator was in a pump room, w/ a 4b cummins. Customer said" My motor blew up and there's oil everywhere!". Drive out at 2 a.m., get there and there is oil from what seems like ceiling to the floor of this little room painted white. Look over, and the breather tube was folded up out of the way when one of our pm guys had changed the fuel filter!

Blew the crankcase oil fill cap off and shutdown on low oil press.

March 9th, 2008, 06:00 PM	#1
91cobra5.0 Hardcore Enthusiast 94 GT Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,055 iTrader: 0 reviews	what are signs of rear main seal leaking? i have an oil leak somewere from mid back on passenger side, n o oil on cats or anything above and cant see anything below with oil on it. my heater core is bad but the hoses arent leaking inside the engine bay, so i dont think its coming from that __________________ 94 GT - Deep Forest Green Off road X, flowmaster single chambers, typhoon intake, hurst short throw, CAI, eibach sportlines, 315s, foxbody short block

March 9th, 2008, 07:28 PM	#3
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,627 iTrader: 0 reviews	Yeah, if you have oil running down the block plate it is usually the rear main. Sometimes it is the flywheel bolts not being sealed properly, sometimes the oil finds its way down from the top of the motor. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

March 9th, 2008, 08:11 PM	#4
91cobra5.0 Hardcore Enthusiast 94 GT Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,055 iTrader: 0 reviews	so loose flywheel bolts can cause it? or will it leak becuase the bolts arent tight enough? __________________ 94 GT - Deep Forest Green Off road X, flowmaster single chambers, typhoon intake, hurst short throw, CAI, eibach sportlines, 315s, foxbody short block

March 9th, 2008, 09:00 PM	#5
FoxHoss Enthusiast 02' GT Join Date: Oct 2007 Location: Brooklyn, CT Posts: 902 iTrader: 0 reviews	the oil leak at the top behind the intake manifold, whats that all about, i think my cars got it __________________ Nitrous is like a hot girl with an STD... you wanna hit it, but your afraid of the consequences 02' GT ~ Twin Screwed 469hp/493tq

March 10th, 2008, 12:59 PM	#11
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,627 iTrader: 0 reviews	^^^ +1, I usually take the oil screen out using a 4 inch dry wall screw. Then, holding it with a pair of vice grips, I burn all the crap off with a propane torch. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

March 9th, 2008, 06:05 PM	#2
blue88lx Regular 88 lx hatch too slow Join Date: Mar 2008 Location: Mansfield, TX Posts: 51 iTrader: 0 reviews	Check the back of the intake manifold and look at the top of the bellhousing. It is a common problem on these cars. Mine is doing it, i'm just waiting to get a different intake. For the rear main, you should have oil running down the exposed bottom of the block plate.

March 9th, 2008, 10:04 PM	#7
Tony_90fox Banned Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,831 iTrader: 0 reviews	yeah, those gaskets are worthless, use some of the Blue rtv and you will be set

March 9th, 2008, 10:19 PM	#8
rodthrower2.3T Regular 88 TurboChicken 8.40/83.4 Join Date: Sep 2007 Location: hobart, IN~W.Lafayette@Purdue Posts: 148 iTrader: 0 reviews	on my 89 aod car that i had you could jack it up and watch it run and once it warmed up you could see oil seep out from the back of the pan from the rear main seal, little hard to see but mine was pretty bad,

March 10th, 2008, 01:31 PM	#12
crumbie50 Regular 1993 Mustang LX 14.0 @ 98 mph Join Date: Mar 2008 Location: Upperstate Posts: 193 iTrader: 0 reviews	I had what I thought was a rear main seal leak in my coupe. Pulled the aod when I was doing my aod-t5 swap and noticed it wasn't the seal, but the oil pan gasket. There was a slight/small break in the gasket and oil was getting through it. Pulled the trans on my '93 f150 truck with a 302 and had the same problem with the oil pan gasket on it. __________________

March 10th, 2008, 03:22 PM	#13
trueblue01 Enthusiast 1989 Mustang LX 10.98@126.7 NA Join Date: Feb 2008 Location: N.E. Ohio Posts: 698 iTrader: 0 reviews	AutoZone.com \| Shopping \| Parts \| Product Detail - Oil Pan Gasket Best oil pan gasket I've found yet. __________________ Never fast enough.

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