TH350 and PCV Line

[ACK]

The PCV valve on my 250 6-cylinder isn't hooked up to the manifold, it just has a long tube hanging from it that doesn't connect to anything. Instead, the TH350's vacuum line is hooked up to the manifold. I have few questions ...

1. Because the PCV valve doesn't have vacuum, could it be contributing to the engine's oil leaks?
2. Can the transmission and the PCV share the manifold vac fitting? If yes, what's the cleanest looking way to split?
3. If the PCV and trans share the vacuum fitting, will there be an issue if I add a brake booster later on?

I checked my Rochester B and unfortunately there's isn't an extra vacuum valve.

[geezer#99]

1. Correct.
2. Correct. With a vacuum tree.
3. yes. with the correct vac tree.
Here's but one example of a vacuum tree. You remove the line into your intake and screw the tree in. Handy, dandy. Lots of fords had them if you're junkyard shopping.
http://www.ebay.com/itm/FORD-Vacuum-...item53f129d5c6

[61K10]

now thats a vacuum tee!!!!!!!

[ACK]

Originally Posted by geezer#99

1. Correct.
2. Correct. With a vacuum tree.
3. yes. with the correct vac tree.
Here's but one example of a vacuum tree. You remove the line into your intake and screw the tree in. Handy, dandy. Lots of fords had them if you're junkyard shopping.
http://www.ebay.com/itm/FORD-Vacuum-...item53f129d5c6

Thank you for the help, time to find a vac tree.

[61_FL_Apache]

You may have some vacuum ports on or under your carb you can use for both.

[thelawdoc]

Geezer#99, I know this thread has aged a bit, but I am wondering about just how much one port off of the Roch B can support for vacuum. I have the distinct recollection that I have read that the brake booster should not share a vacuum line. I just cannot remember where I read that, but I remembered it because my booster is sharing vacuum with my pcv and distributor and I was wondering where I might tap a new vacuum source. I have the '66 C10 250 I6 w/Pg 2spd & Rochester B.

[geezer#99]

Boy you're lucky.
I just happened to see this.
There should be a plug on your intake below the carb that you can tap in to.

[thelawdoc]

Geezer#99, Yes, anytime I visit this forum I get lucky! Thanks, I will have a look at my intake. I want to separate away the booster.

[geezer#99]

It'll be a square headed plug like in post #29 here or post #75 which shows a booster hooked there.
http://67-72chevytrucks.com/vboard/s...=471078&page=2

[thelawdoc]

Yes, thanks. Looks like it should be pretty accessible. I never noticed it. My po, who was pretty knowledgeable about trucks, did not use it, preferring to tee the vacuum needs. Do you know offhand which fitting will go in there?

[geezer#99]

It'll likely be 1/2 inch pipe thread. You can get a fitting that will screw in that has a barbed end on it that your hose slides on to. They might make them in a 90 degree elbow style.
The fun will be getting the old one out. When you do take it to the parts store to match up the size.
Kinda like this one.
http://greatlakesskipper.com/bayline...-elbow-fitting

[thelawdoc]

Geezer#99, Yep, I see it. My po has it vacuuming the PowerGlide. My booster is sharing vacuum with the pcv. I am going to switch things a bit and have the booster take direct from the intake manifold and the PG share vacuum with the pcv. (Distributor has personal fitting directly off the Roch B.) Not that I understand the dynamics of vacuum, but only because I have read that the booster ought not share its vacuum source.
PS: Wow. Just noticed the price of that little fitting- $14! Glad I have a fitting already, but if I needed one, I think I could find something cheaper at Home Depot or Lowes. I mean, it is just a vacuum fitting.

[geezer#99]

That was just an example. Cheap at 14 bucks. One like that in stainless steel is over a 100 bucks.
Yes shop around. Plumbing places will have some and parts stores.

[thelawdoc]

Geezer#99, Well that has me scratching my head. $100? For a ss fitting? On a vacuum? I must be missing something here. I see such fittings go for a few dollars to maybe several dollars tops. I will never look at a fitting the same way again! And I will think twice now before scrapping any old ones. Now I understand why guys have these lines all tee'd up.

[geezer#99]

The big buck fittings where for special uses. Depending on what liquid or gas was used.
I worked in the largest sour gas plant in north america for 30 years. The cost of some fittings would make your head spin. All calculated into the cost of doing business. When you're producing a million dollars worth of natural gas a day then a 100 buck fitting is peanuts!!
Anyhow, shop around or take a trip to your local autowreckers. Look on old Fords. They had lots of oddball fittings.
Happy hunting!!