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Rear of Block: Oil Leak

Moderator: Mod Squad

65_Stang_170
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Rear of Block: Oil Leak

Post #1 by 65_Stang_170 » Fri Jan 17, 2020 10:28 am

Howdy Y'all!

I have a slow leak between the oil pan and the rear main (I think...?). Should it be fixed or is it not an issue as long as it's not pouring out?

Is that just a new oil pan gasket or is it the rear main seal? Pic below.

Thanks in advance!

-Shawn
Image
1965 Mustang Coupe - 170 I6, T5 Manual Transmission, Weber 32/36 Carb, Arning Drop

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bubba22349
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Re: Rear of Block: Oil Leak

Post #2 by bubba22349 » Fri Jan 17, 2020 12:20 pm

65_Stang_170 wrote:Howdy Y'all!

I have a slow leak between the oil pan and the rear main (I think...?). Should it be fixed or is it not an issue as long as it's not pouring out?

Is that just a new oil pan gasket or is it the rear main seal? Pic below.

Thanks in advance!

-Shawn
Image


In your picture I don't see signs of an oil leak must of cleaned it some already? Would be up to you if you want to fix it if it's not leaking much. If it were the main seal it would be coming out a little higher around the crankshaft flange and block. This would be a harder job but still could be done with engine in the car. The oil pan gasket and end seals is fairly easy job that could also be done in the car. Another area that can leak a small amount of oil are the flywheel mounting bolts if a thread sealer isn't used. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

65_Stang_170
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Posts: 61
Joined: Sat Nov 11, 2017 12:13 pm

Re: Rear of Block: Oil Leak

Post #3 by 65_Stang_170 » Fri Jan 17, 2020 1:00 pm

bubba22349 wrote:
In your picture I don't see signs of an oil leak must of cleaned it some already? Would be up to you if you want to fix it if it's not leaking much. If it were the main seal it would be coming out a little higher around the crankshaft flange and block. This would be a harder job but still could be done with engine in the car. The oil pan gasket and end seals is fairly easy job that could also be done in the car. Another area that can leak a small amount of oil are the flywheel mounting bolts if a thread sealer isn't used. Good luck :thumbup: :nod:


Bubba, yes, I cleaned it up a little bit, but it was probably only a drop every so often. Luckily no fluid on the flywheel or clutch, so it must just be between the oil pan and that area under the rear main. Thank you for the info.
1965 Mustang Coupe - 170 I6, T5 Manual Transmission, Weber 32/36 Carb, Arning Drop

65_Stang_170
Registered User
Posts: 61
Joined: Sat Nov 11, 2017 12:13 pm

Re: Rear of Block: Oil Leak

Post #4 by 65_Stang_170 » Fri Jan 17, 2020 2:50 pm

bubba22349 wrote:The oil pan gasket and end seals is fairly easy job that could also be done in the car. :nod:


Also, would I need to drain the oil before doing this? or will it be settled down on the bottom of the pan?

I'm guessing it might be easier with it drained...? Thanks!
1965 Mustang Coupe - 170 I6, T5 Manual Transmission, Weber 32/36 Carb, Arning Drop

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wsa111
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Re: Rear of Block: Oil Leak

Post #5 by wsa111 » Fri Jan 17, 2020 3:31 pm

Don't forget to put sealer on your flywheel bolts. They are open to oil at the rear main area.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, DSII dist. MSD-6al & MSD-Blaster 8252 Coil. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
2003 Ford Lightning daily driver. Recurving Distributors. billythedistributorman@live.com
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bubba22349
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Re: Rear of Block: Oil Leak

Post #6 by bubba22349 » Fri Jan 17, 2020 4:26 pm

65_Stang_170 wrote:
bubba22349 wrote:The oil pan gasket and end seals is fairly easy job that could also be done in the car. :nod:


Also, would I need to drain the oil before doing this? or will it be settled down on the bottom of the pan?

I'm guessing it might be easier with it drained...? Thanks!


Technically you could drop the pan without draining the oil, but yes it's easier and there's less of a chance of spilling oil all over the place by draining it. If you needed to reuse the oil in a case like it's been recently changed you could filter it through a paint strainer or a nylon stocking and then reuse it. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

65_Stang_170
Registered User
Posts: 61
Joined: Sat Nov 11, 2017 12:13 pm

Re: Rear of Block: Oil Leak

Post #7 by 65_Stang_170 » Fri Jan 17, 2020 7:21 pm

wsa111 wrote:Don't forget to put sealer on your flywheel bolts. They are open to oil at the rear main area.

Will do! Thanks Bill!
1965 Mustang Coupe - 170 I6, T5 Manual Transmission, Weber 32/36 Carb, Arning Drop

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