390 collapsing pcv hose
Thread Starter
|
Senior User
Joined: Dec 2005
Posts: 149
Likes: 0
390 collapsing pcv hose
390 engine
I replaced the pcv valve and the hose with new hose clamps, but the hose still collapses.
its as though there's too much vacuum for the pcv valve to keep up...could it be the wrong pcv valve?
I replaced the pcv valve and the hose with new hose clamps, but the hose still collapses.
its as though there's too much vacuum for the pcv valve to keep up...could it be the wrong pcv valve?
Tuned
Joined: Aug 2003
Posts: 286
Likes: 32
yup, wrong hose
As has been mentioned, its not heater hose. There are a couple sources for the right hose. I bought mine from www.mansfieldmustang.com. Check out the hose they have listed for 69 390 GT. The one I bought had a ford part number on it. May still be available from Ford as well.
Senior User
Joined: Sep 2006
Posts: 162
Likes: 0
From: Newbury Park Ca.
When did this problem start? Is this a fresh engine/plumbing set up?........AND what type cap do you have on the other valve cover?.....The PCV has to be able to draw air from somewhere, and it sounds like your system is air tight, or the PCV valve is in backward????????.......aMP
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Uh, one thing I noticed about this...
The PCV valve system has a BREATHER on the valve cover opposite the PCV valve.
You should not build enough vacuum to collapse even heater hose.
At least, that's the way the stock setup works. If you want a vacuum in the crankcase, then you have definitely achieved that
The PCV valve system has a BREATHER on the valve cover opposite the PCV valve.
You should not build enough vacuum to collapse even heater hose.
At least, that's the way the stock setup works. If you want a vacuum in the crankcase, then you have definitely achieved that
Trending Topics
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by krewat
Uh, one thing I noticed about this...
The PCV valve system has a BREATHER on the valve cover opposite the PCV valve.
You should not build enough vacuum to collapse even heater hose.
At least, that's the way the stock setup works. If you want a vacuum in the crankcase, then you have definitely achieved that
The PCV valve system has a BREATHER on the valve cover opposite the PCV valve.
You should not build enough vacuum to collapse even heater hose.
At least, that's the way the stock setup works. If you want a vacuum in the crankcase, then you have definitely achieved that
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer!["Beemer Nut"'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23bc5285' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
But it keeps the oil leaks under control with a high crankcase vacuum.
Out needs in replacement, i've run heater hose over 800K trouble free miles.
Old school here with rebuildable PCV valve, same one over 36 years and million miles.
Out needs in replacement, i've run heater hose over 800K trouble free miles.
Old school here with rebuildable PCV valve, same one over 36 years and million miles.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Are we talking about the hose from the PCV valve to the carb (manifold vacuum) or the hose coming off the breather?
The only reason for the hose (from the carb to the PCV) to collapse is either the PCV valve is clogged or somehow stuck closed, or the breather on the other valve cover isn't a breather
I'm going on what I've seen on late 60's autos w/PCV and my '74 highboy. Was there ever a case where Ford put on a PCV system and had an air-tight cap on the other valve cover?
The only reason for the hose (from the carb to the PCV) to collapse is either the PCV valve is clogged or somehow stuck closed, or the breather on the other valve cover isn't a breather
I'm going on what I've seen on late 60's autos w/PCV and my '74 highboy. Was there ever a case where Ford put on a PCV system and had an air-tight cap on the other valve cover?
Freshman User
Joined: Nov 2006
Posts: 28
Likes: 0
I have the same problem. 1967 352 2bbl, 3 on the tree, 2wd, stock, leaks oil & needs to be rebuilt. Got new PCV valve, new breather cap w/new hose to new air breather. I collapse heater hose and molded PCV hose. What is stopped up between breather cap & PCV valve?
Senior User
Joined: Jun 2004
Posts: 264
Likes: 0
From: las vegas nv.
Start pulling hoses,the cap/breather on the other valve cover whatever. And see if you get a sigh of relief from somewhere...17to21 lbs of vacuum psi can seem like a lot more when it's contained. I saw a hose that was'nt the proper material delaminate the layers, the inside layer callapsed and blocked off the hose...all the while looking fine from the outside.
Freshman User
Joined: Nov 2006
Posts: 28
Likes: 0
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Originally Posted by 67owner
Mine, with the truck running, hose in my hand & pcv valve in the end of the hose, I can see the pcv valve close & stay closed, collapsing the hose. I have tried 3 valves from 3 different parts stores, all look the same as when I bought the truck.
Mondo Bizarro...
Carl (Beemer Nut), when I said "air tight cap" I didn't mean the type with the hose going back to the air cleaner. My '74 had that setup. A '67 390 I have in the garage had just a vented cap (with filter media inside).