PVC manifold vaccum port? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

7tee · 01-03-2016, 07:09 PM

Trying to help a friend that just got a 68 straight 6 250.

On the rear of the valve cover is where the pvc is located and the hose runs down the intake manifold between the head and the carb.

The problem is the nipple in the manifold (where the hose attaches) is pushed down inside and is loose.

1) How do you fix this

2) Can this cause a vacuum leak on the carb...

Thanks...ed...

geezer#99 · 01-03-2016, 07:11 PM

Is the manifold on the truck?
And it will create a vacuum leak!

7tee · 01-03-2016, 07:17 PM

Yes it is on the truck and not sure what to do...ed

geezer#99 · 01-03-2016, 07:25 PM

Wrestle the one that's in there outta there and make a new one. A piece of tubing can be made to fit easily.
Or fix the piece you remove.

If you can't get it out you might need to remove the intake to fix it.

7tee · 01-03-2016, 07:37 PM

[QUOTE=geezer#99;7433541]Wrestle the one that's in there outta there and make a new one. A piece of tubing can be made to fit easily.
Or fix the piece you remove.

If you can't get it out you might need to remove the intake to fix it.[/Q

Ok I'll give it a shot tomorrow or the next and I'll get back with you, btw should it put some type of sealer around the tubing? Thanks man (geezer#99)...ed...

geezer#99 · 01-03-2016, 07:39 PM

Long nose needlenose pliers might work.

poway · 01-03-2016, 07:55 PM

The hose connector on the top of the intake manifold is for the brake booster. The port on the left side of the intake manifold (closest to the drivers side) is where the PCV hose runs to. You will have to buy a fitting to thread into it. I tried connecting mine to the port on the top of the intake maifold and it blew oil out of the dipstick tube.

7tee · 01-03-2016, 08:21 PM

Quote:

Originally Posted by poway

The hose connector on the top of the intake manifold is for the brake booster. The port on the left side of the intake manifold (closest to the drivers side) is where the PCV hose runs to. You will have to buy a fitting to thread into it. I tried connecting mine to the port on the top of the intake maifold and it blew oil out of the dipstick tube.

Hmm, after looking at several other straight 6's on this forum, it like the pvc is going there. I personally don't know much about 6's but I'm learning so I can help my friend. Thanks for your response and your suggestion is noted and we'll see where it goes from here. Btw this not his manifold, I'm just using this pic to show the nipple port...ed...

7tee · 01-05-2016, 07:46 AM

Ok, so this nipple just sits down in the hole but will pull back out pretty easy maybe causing a vacuum. Should this be sealed down? And with what, thanks...ed...

poway · 01-07-2016, 12:42 AM

Ed:
Clean the fitting and the hole and apply a thin layer of permatex to it and insert it into the hole. Being careful not to use too much where it will get into the inside of the manifold. Either cap it or connect the PCV hose. In my case, when I connected it to this fitting, it blew oil out of the dipstick. I connect it to the driver’s side port, the “blow by” went away.

**70STOVEBOLT** · 01-08-2016, 06:38 PM

That nipple IS for the pcv valve. I would use JB Weld or a high-temp epoxy on it.

poway · 01-08-2016, 11:16 PM

I’m going to have to figure out why the engine was blowing oil out of the dipstick tube when I have my PCV hose connected to it. When I bought the truck in May, it was set up with the PCV hose connected to the port on the side. Had no problem until I connected it to the top port. Not sure why it happened. If anyone on this site has any info please share it with everyone.
Thanks…Poway

**70STOVEBOLT** · 01-11-2016, 12:05 PM

Is the tube plugged that goes down into the intake manifold?

7tee · 01-11-2016, 01:41 PM

[QUOTE=70STOVEBOLT;7440059]That nipple IS for the pcv valve. I would use JB Weld or a high-temp epoxy on it.[/QUOTE

This is what I did, thanks...ed...

**70STOVEBOLT** · 01-11-2016, 05:05 PM

[quote=7tee;7443563]

Quote:

Originally Posted by 70STOVEBOLT

That nipple IS for the pcv valve. I would use JB Weld or a high-temp epoxy on it.[/QUOTE

This is what I did, thanks...ed...

Glad to hear you got it taken care of.

01-03-2016, 07:09 PM	#1
7tee Registered User Join Date: Mar 2015 Location: Fletcher, N.C. Posts: 309	PVC manifold vaccum port? Trying to help a friend that just got a 68 straight 6 250. On the rear of the valve cover is where the pvc is located and the hose runs down the intake manifold between the head and the carb. The problem is the nipple in the manifold (where the hose attaches) is pushed down inside and is loose. 1) How do you fix this 2) Can this cause a vacuum leak on the carb... Thanks...ed... Attached Images __________________ 1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado... Last edited by 7tee; 01-03-2016 at 07:15 PM.

01-03-2016, 07:11 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,702	Re: PVC manifold vaccum port? Is the manifold on the truck? And it will create a vacuum leak!

01-03-2016, 07:17 PM	#3
7tee Registered User Join Date: Mar 2015 Location: Fletcher, N.C. Posts: 309	Re: PVC manifold vaccum port? Yes it is on the truck and not sure what to do...ed __________________ 1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado...

01-03-2016, 07:25 PM	#4
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,702	Re: PVC manifold vaccum port? Wrestle the one that's in there outta there and make a new one. A piece of tubing can be made to fit easily. Or fix the piece you remove. If you can't get it out you might need to remove the intake to fix it.

01-03-2016, 07:37 PM	#5
7tee Registered User Join Date: Mar 2015 Location: Fletcher, N.C. Posts: 309	Re: PVC manifold vaccum port? [QUOTE=geezer#99;7433541]Wrestle the one that's in there outta there and make a new one. A piece of tubing can be made to fit easily. Or fix the piece you remove. If you can't get it out you might need to remove the intake to fix it.[/Q Ok I'll give it a shot tomorrow or the next and I'll get back with you, btw should it put some type of sealer around the tubing? Thanks man (geezer#99)...ed... __________________ 1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado...

01-03-2016, 07:39 PM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,702	Re: PVC manifold vaccum port? Long nose needlenose pliers might work.

01-03-2016, 07:55 PM	#7
poway Registered User Join Date: Jun 2012 Location: Poway, CA Posts: 119	Re: PVC manifold vaccum port? The hose connector on the top of the intake manifold is for the brake booster. The port on the left side of the intake manifold (closest to the drivers side) is where the PCV hose runs to. You will have to buy a fitting to thread into it. I tried connecting mine to the port on the top of the intake maifold and it blew oil out of the dipstick tube.

01-05-2016, 07:46 AM	#9
7tee Registered User Join Date: Mar 2015 Location: Fletcher, N.C. Posts: 309	Re: PVC manifold vaccum port? Ok, so this nipple just sits down in the hole but will pull back out pretty easy maybe causing a vacuum. Should this be sealed down? And with what, thanks...ed... __________________ 1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado...

01-07-2016, 12:42 AM	#10
poway Registered User Join Date: Jun 2012 Location: Poway, CA Posts: 119	Re: PVC manifold vaccum port? Ed: Clean the fitting and the hole and apply a thin layer of permatex to it and insert it into the hole. Being careful not to use too much where it will get into the inside of the manifold. Either cap it or connect the PCV hose. In my case, when I connected it to this fitting, it blew oil out of the dipstick. I connect it to the driver’s side port, the “blow by” went away.

01-08-2016, 06:38 PM	#11
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,352	Re: PVC manifold vaccum port? That nipple IS for the pcv valve. I would use JB Weld or a high-temp epoxy on it. __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear

01-08-2016, 11:16 PM	#12
poway Registered User Join Date: Jun 2012 Location: Poway, CA Posts: 119	Re: PVC manifold vaccum port? I’m going to have to figure out why the engine was blowing oil out of the dipstick tube when I have my PCV hose connected to it. When I bought the truck in May, it was set up with the PCV hose connected to the port on the side. Had no problem until I connected it to the top port. Not sure why it happened. If anyone on this site has any info please share it with everyone. Thanks…Poway

01-11-2016, 12:05 PM	#13
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,352	Re: PVC manifold vaccum port? Is the tube plugged that goes down into the intake manifold? __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear

01-11-2016, 01:41 PM	#14
7tee Registered User Join Date: Mar 2015 Location: Fletcher, N.C. Posts: 309	Re: PVC manifold vaccum port? [QUOTE=70STOVEBOLT;7440059]That nipple IS for the pcv valve. I would use JB Weld or a high-temp epoxy on it.[/QUOTE This is what I did, thanks...ed... __________________ 1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado...



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