distributor o ring leaking still
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Senior User
Joined: Mar 2010
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distributor o ring leaking still
Been having a problem with the distributor leaking. originaly it was not leaking. I rebuilt the motor the o ring was brittle, replaced it and now it leaks.
I have tried several O rings, all same result. any suggestions?
I have tried several O rings, all same result. any suggestions?
Thread Starter
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Senior User
Joined: Mar 2010
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I tried gasket sealer but it didnt really help
Fleet Mechanic
Joined: Sep 2009
Posts: 1,572
Likes: 37
From: Northern Virginia.
well make sure you use a hose from both valve cover vents and "T" them together and from the "T" to the Carb intake port. make sure they go to a good vacuum source.
i would use the copper high temp RTV on the O ring also. let it dry before running the truck.
i would use the copper high temp RTV on the O ring also. let it dry before running the truck.
Fleet Mechanic
Joined: Sep 2009
Posts: 1,572
Likes: 37
From: Northern Virginia.
get a gasket like this one. and double up if need be. or RTV it. it sits flat on the engine.
can you take a pic for me of where it is leaking and the o ring.
Fel-Pro Q70194 - Fel-Pro Distributor Base Gaskets - Overview - SummitRacing.com
can you take a pic for me of where it is leaking and the o ring.
Fel-Pro Q70194 - Fel-Pro Distributor Base Gaskets - Overview - SummitRacing.com
New User
Joined: Aug 2011
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I am new to this thread but have the same problem. I recently put a rebuilt 390 in my son's 73 F250 and have had a distributor gasket leak since putting it in. I put a new PCV on with the new motor.
- I put a new beveled gasket on the distributor to rule out the gasket and it still leaked
- I added copper RTV to build up the gasket around the intake and it still leaked
- I just bought another PCV but the existing was not stuck...we shall see
Any other ideas? This is becoming annoying since the engine is running great other wise.
Thanks in advance. TXHighboy
- I put a new beveled gasket on the distributor to rule out the gasket and it still leaked
- I added copper RTV to build up the gasket around the intake and it still leaked
- I just bought another PCV but the existing was not stuck...we shall see
Any other ideas? This is becoming annoying since the engine is running great other wise.
Thanks in advance. TXHighboy
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Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
You sure the front if the intake isn't leaking down into the distributor hole? It's very strange for you to have a leak there. I wouldn't use RTV unless you never want to adjust timing again!
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New User
Joined: Aug 2011
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Definitely seeping from intake hole for the distributor. Other than the PCV, would a faulty breather cap on the valve cover make a big difference to the pressure? Will send picture tomorrow when my son comes over. thanks
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
If either of you guys had a crankcase vent problem it would be gushing from the front and rear mains, oil pan gasket and blowing the dipstick out before it caused a leak at the distributor.
New User
Joined: Aug 2011
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Well I found my problem. The engine was rebuilt by a friend and someone put a oil breather cap on the left valve cover instead of the matching PCV. I ended putting a T off the vacuum on the carburetor, installed the matching PCV and connected it to the T inlet and BINGO...no oil leak! Both sides have a good solid vacuum with a PCV and this is venting the crankcase properly. Hope this helps the next guy. BTW, I found many threads on google to other sites that listed distributor leaks. Good luck!
Posting Guru
Joined: Dec 2009
Posts: 2,134
Likes: 1
From: Mississippi
So you are pulling vacuum from both valve covers? Wouldnt that create a vacuum inside the crankcase as opposed to just ventilating the crankcase; ie instead of pushing oil out past the rear main like you might with no pcv you might draw air inside the crankcase from there?
Cargo Master
Joined: Oct 2011
Posts: 2,246
Likes: 303
From: Kenner,La.
crankcase vacuum
2 things I have seen from pulling a negative pressure on a crankcase,
You may experience a "back fire" on decelleration or if the breather hole is plugged on the fuel pump the diaphram will collapse and the pump stops working. I know this sounds weird but it can happen. Kenny
You may experience a "back fire" on decelleration or if the breather hole is plugged on the fuel pump the diaphram will collapse and the pump stops working. I know this sounds weird but it can happen. Kenny
Posting Guru
Joined: Dec 2009
Posts: 2,134
Likes: 1
From: Mississippi
2 things I have seen from pulling a negative pressure on a crankcase,
You may experience a "back fire" on decelleration or if the breather hole is plugged on the fuel pump the diaphram will collapse and the pump stops working. I know this sounds weird but it can happen. Kenny
You may experience a "back fire" on decelleration or if the breather hole is plugged on the fuel pump the diaphram will collapse and the pump stops working. I know this sounds weird but it can happen. Kenny
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