383 oil pan leakage?

woodwiz

Well-Known Member
Joined
Dec 10, 2020
Messages
524
Reaction score
391
Location
Tucson,Az.
I have 383 in the RR that after driving or just running it up to operating temp next day will show an oil drip hanging off the bottom of the flywheel inspection cover plate..weep hole. Had the rear main done less than 300mi ago. I guess in some cases that does not matter. So I have been trying to determine through investigation that it might be coming from above and finding its way to the lowest point. Just replaced the valve covers (cork) gaskets with a very thin skim coat of oil resistant sealer.
Also checked the valley tray bolts at the back of the intake manifold and all appears dry.
Which brings me to this, when looking at the oil pan where the gasket/windage tray/gasket/pan come together like a sandwich it seems to be wet. Could the oil be coming from this area somewhere in the trail of bolts that put it all together? I may for peace of mind drop it off of the motor and redo it and while I’m there have a look up inside to the main cap for signs of oil leaking.
Thoughts &ideas welcome!
Thanks!
 

MoparDan

Well-Known Member
Joined
Mar 15, 2021
Messages
624
Reaction score
691
Location
Stuarts Draft Virginia.
That's not a leak, it's horse power piss. I could be the back of the pan, there are 5 sealing surfaces with a windage tray. I would remove the transmission inspection cover, clean it all up and run it. That might give you a better idea. I've seen guys replace the rear main, start it up and it still leaks out of the side seals
 

STXCUDA

Member
Joined
May 20, 2025
Messages
10
Reaction score
12
Location
Laredo, Texas
Hard to say without seeing it but yes it's definitely a sandwich of parts and difficult to avoid any leakage. I've had luck going with the Mancini Billet rear main seal retainer and the one piece rubber oil pan/windage tray from Summit. Sorry not much help but just my .02 cents about my experience.
 

woodwiz

Well-Known Member
Joined
Dec 10, 2020
Messages
524
Reaction score
391
Location
Tucson,Az.
In the process of elimination I changed out the valve covers with cork gaskets and have driven the car and run it to operating temperature and so far leak free. A buddy told me if you don’t look under it,it’s not leaking
 

STXCUDA

Member
Joined
May 20, 2025
Messages
10
Reaction score
12
Location
Laredo, Texas
In the process of elimination I changed out the valve covers with cork gaskets and have driven the car and run it to operating temperature and so far leak free. A buddy told me if you don’t look under it,it’s not leaking
The same is true if you never put oil in the engine. Dry as a bone!
 

Russ69Runner

Well-Known Member
Joined
Aug 4, 2016
Messages
7,827
Reaction score
3,406
Location
Lake Wales Fl.
My car marks its spot so figure it is a Chrysler thing. New gaskets everywhere. Did find leak coming from the rear valve cover gasket. New cork also a thin layer of gray sealant. Not enough to worry about. Even pulled the manual trans. and put new seals in it. Still leaked. Fallowed the leak from the valve cover ran down to where the head met the block then ran down the bell housing where it met the engine. Then went down to the very bottom and dripped. Have tightened bolts and just figure it is what I said before a Chrysler thing. You may check some bolts on the motor go into the oil journals put gray sealant on those bolts also. Must be careful not to over tighten them the sealant will change toque value. Wish you the best. :thumbsup2:
 

markontario

Member
Joined
Aug 29, 2012
Messages
14
Reaction score
7
my motor was rebuilt 30 years ago and I get 4 or 5 drips a year. Rubber floor in garage so I just clean it up.
 
Back
Top