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#1 |
Registered User
Join Date: Apr 2011
Location: Ventura, ca
Posts: 8
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Crankshaft vent
i have a 67 chevy that had a two barrel carb. i took off the old carb and intake manifold. i replaced the intake with one i had #3927184 ( new intake manifold). the new intake doesnt have an oil fill tube so i replaced the valve covers with new edelbrock valve covers and put a breather in them. now i have no place to run my crank shaft vent hose to so i was wondering if i could just cap the hole since i have the breather in the valve cover???? any advice would help!!!!
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#2 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Crankshaft vent
Are you talking about a road draft tube or a pcv? You need a pcv to stop the engine from spewing oil and keep the gasses out of the crankcase. You should have a breather in one valve cover and a pcv valve in the other valve cover.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#3 |
Registered User
Join Date: Apr 2011
Location: Ventura, ca
Posts: 8
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Re: Crankshaft vent
i have a breather in one and i dont have anything in the other yet what is this pvc? can you explain it more please?
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#4 |
Registered User
Join Date: Apr 2011
Location: Ventura, ca
Posts: 8
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Re: Crankshaft vent
pcv
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#5 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Crankshaft vent
Positive crankcase ventilation. It uses engine vacuum to suck the fumes moisture and other bad stuff out of the crank case. If pressure is allowed to build up inside the engine it can cause oil leaks by pushing out the gaskets. Way back in the day they used a road draft tube which basically just let oil blow out of the engine onto the ground which served as the vent but that isnt the best way for obvious reasons.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#6 |
Registered User
Join Date: Apr 2011
Location: Ventura, ca
Posts: 8
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Re: Crankshaft vent
so do i connect the old crankshaft vent (that went to the air filter before) to the pcv valve in the other valve cover? i would post a pic but i dont know how. sorry
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#7 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Crankshaft vent
Ahhh i understand now. Forget about the tube that went to the intake. Its not needed with the aftermarket breathers that go into the valve cover. The other valve cover should have a hole about the same size as the one you put the breather in. INstall a pcv valve into that hole with a grommit. Then run a vaccum hose from the pcv to the large vacuum port at the base of the carburetor.
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#8 |
Registered User
Join Date: Apr 2011
Location: Ventura, ca
Posts: 8
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Re: Crankshaft vent
ok cool but what about the old hole? it is still open so can i just make a cover for it and plug it or do i need to do something else with it?
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#9 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
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Re: Crankshaft vent
Pictures would be great...
Gary
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#10 |
Registered User
Join Date: Apr 2011
Location: Ventura, ca
Posts: 8
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Re: Crankshaft vent
no the hole going into the block next to the distributor. i would post a pic but i dont know how to post it. i have one on my comp right now, everytime i try it asks me for a http: for my pic or something
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#11 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Crankshaft vent
Ohhhh your engine has a road draft tube. If you run a pcv and breather you can eliminate the road draft tube by plugging the hole.
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#12 |
Registered User
Join Date: Apr 2011
Location: Ventura, ca
Posts: 8
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Re: Crankshaft vent
is there a recommended way of plugging it or can i just make a metal plate and throw a gasket on it to plug it? i really appreciate the help.
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#13 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Crankshaft vent
As long as you seal it up you shouldnt have any problems. As I said you need to make sure you have a good working pcv system in place or you will start have bad oil leak issues.
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#14 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Crankshaft vent
You can plug the breather hole in the rear of the block with the correct size of freeze plug. I believe the correct size is 1-1/4", but you might want to double check that as it's been a long time since I've done this.
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crankshaft vent, intake manifold, oil fill tube |
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