PCV breather?
Thread Starter
|
New User
Joined: Oct 2019
Posts: 2
Likes: 0
PCV breather?
Hello all. I have an 85 F150 with the 300 and a carburetor, and 4 speed overdrive floor shift I bought new in 85 with 7 miles on it, right now just short of 400,000. It's been all over the midwest and points east, but now is retired like me and just makes local trips within a hundred miles or so. I saw a post from a fellow talking about the breather that is just behind the oil fill cap and goes from the valve cover back to the air filter, and he said this is actually sucking air in as the PCV lets it exhaust out. OK, if that is so, is there supposed to be some kind of filter element inside it? It would be taking air from the air cleaner housing on the unfiltered side and sucking it right into the valve train, so, it is either supposed to be filtering, or it is not doing what the other fellow said. I thought it might be exhausting air back into the carburetor that the PCV valve was letting in, since if going the other way, at some point it would be clogged up. Thanks for any help.
Last edited by Clint Wilde; Oct 10, 2019 at 09:28 AM. Reason: Forgot something
Moderator
Joined: Jan 2001
Posts: 57,012
Likes: 2,750
From: Virginia
The guy is right, you should have a little plastic thing in the aircleaner that holds a foam filter. If your engine has 400,000 miles on it though, I doubt you have to worry about it sucking in dirty air. A engine with that many miles is going to have quite a bit of blowby. When the blowby volume gets too much for the PCV valve to suck it all out, it starts backing up that pipe and spitting out in your air cleaner.
Thread Starter
|
New User
Joined: Oct 2019
Posts: 2
Likes: 0
Thanks for that info Franklin2. Yes, there is blow by. The one I have is not part of the filler cap, a separate part. There is no filter element in it anymore, guess I will stuff it with some old filter material that will take gas and oil. Been unable to find anything like mine as a replacement.
Mountain Pass
Joined: Jul 2018
Posts: 128
Likes: 1
I have the exact same set up on my 1986 5.0 EFI. I only have 150K miles on my engine and I am getting blow back in my air filter. Last week I did replace the breather. I found it at O'Reilly's for less than $5. I hope that my engine gets to 400,000 miles.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Thanks for that info Franklin2. Yes, there is blow by. The one I have is not part of the filler cap, a separate part.
There is no filter element in it anymore, guess I will stuff it with some old filter material that will take gas and oil.
Been unable to find anything like mine as a replacement.
There is no filter element in it anymore, guess I will stuff it with some old filter material that will take gas and oil.
Been unable to find anything like mine as a replacement.
1971/74 E100/300/F100/350 240/300 // 1975/96 F100/350 300 // 1980/96 Bronco 300 /// 1971/83 Ford/Merc Passenger Cars with 200/250 I-6's.
FTE Legend
Joined: Nov 2015
Posts: 30,960
Likes: 4,129
From: Angier, NC
You can get that breather filter from any parts store I would not waste my time trying to stuff it.
Dave ----
Dave ----
Trending Topics
Moderator
Joined: Jan 2001
Posts: 57,012
Likes: 2,750
From: Virginia
Thanks for that info Franklin2. Yes, there is blow by. The one I have is not part of the filler cap, a separate part. There is no filter element in it anymore, guess I will stuff it with some old filter material that will take gas and oil. Been unable to find anything like mine as a replacement.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Mountain Pass
Joined: Jul 2018
Posts: 128
Likes: 1
Franklin2- Very interesting idea that I might try. So the hose coming off the oil fill cap is the one you disconnect from the air filter housing, lengthen it, and then put into a can.
Dumb Question Alert - Would that not effect the operation of the PCV system? I thought that the hose coming from the oil filler cap was integral to the operation of the PCV.
Dumb Question Alert - Would that not effect the operation of the PCV system? I thought that the hose coming from the oil filler cap was integral to the operation of the PCV.
Moderator
Joined: Jan 2001
Posts: 57,012
Likes: 2,750
From: Virginia
The PCV valve is located in there somewhere, leave it alone. It goes from the valve cover to the intake manifold, usually at or near the base of the carb. I have seen the valve located in it's own hole in the valve cover, and I have seen it located actually in the oil cap before also. Leave it original and look for the other port in the system, that should be the one going to the aircleaner. That is SUPPOSED to be the air intake like you first described, and it is when the engine is new. As the engine wears, the blow-by gets progressively worse till the PCV valve can't keep up with it. By that time, your PCV system is not working as designed anyway, you are just trying to keep a engine going that actually should be taken out of service and rebuilt. But sometimes time and money dictate what you have to do, and making the catch system can keep a wore out engine going a little longer.
Uphill All Day
Joined: Jun 2018
Posts: 750
Likes: 489
From: Northwest, Georgia
Good pic. I am in need of the hose with the elbow in it. I have not gone through the epc to try to find a part number yet.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
The hose can be bulk PCV-rated hose from the parts store.
There are two such elbows - one 45* the other 90*.
They are long since obsolete (maybe you can find a Dorman equivalent?) but show up on eBay from time to time.
Search on:
E5UZ-9E606-A .. Air Cleaner Inlet Hose Adapter ~ 3/4" -90 degree elbow / Obsolete
E6FZ-9E606-A .. Air Cleaner Inlet Hose Adapter ~ Straight 3/4" / Obsolete
There are two such elbows - one 45* the other 90*.
They are long since obsolete (maybe you can find a Dorman equivalent?) but show up on eBay from time to time.
Search on:
E5UZ-9E606-A .. Air Cleaner Inlet Hose Adapter ~ 3/4" -90 degree elbow / Obsolete
E6FZ-9E606-A .. Air Cleaner Inlet Hose Adapter ~ Straight 3/4" / Obsolete
Cargo Master
Joined: Mar 2008
Posts: 2,576
Likes: 210
From: Washington
FRAM Engine Crankcase Breather Element BA6592 | FRAM
1985 - 1986 inline 6 used a different part, has a filter inside it, which is why there isn't one in the air cleaner
copied from the above web site
AC-DELCOFB131
BALDWINSA4137
CAM2B3165
CARCARE PARTSBF6592
CASITECFB6591
CENEXAFB7844
CITGOAFB7844
CITGOB3165
COBRAFD190
DEUTSCHBF412
FORDE6TZ-6A768-A
FORDF1BZ-6A768-A
GRAND PRIXAFB7844
GREASE MONKEYB3165
GROUP 7B23165
GROUP 7B3165
HASTINGSCB36
INSTALLER EDGEBA6592
INSTALLER EDGEBA6592
KENDALLB3165
KRALINATORLA1443
LUBER-FINERAFB7844
MIGHTYAFB7844
MIGHTYFA3165
MOBILB3165
MOTORCRAFTFA-1118
PRO GAUGEFA-768
PUROLATORB23165
QUAKER STATEB23165
QUAKER STATEB3165
SERVICE 154312
SHELLB3165
UNOCALFB676
WARNERAFB7844
WIX66501
1985 - 1986 inline 6 used a different part, has a filter inside it, which is why there isn't one in the air cleaner
copied from the above web site
AC-DELCOFB131
BALDWINSA4137
CAM2B3165
CARCARE PARTSBF6592
CASITECFB6591
CENEXAFB7844
CITGOAFB7844
CITGOB3165
COBRAFD190
DEUTSCHBF412
FORDE6TZ-6A768-A
FORDF1BZ-6A768-A
GRAND PRIXAFB7844
GREASE MONKEYB3165
GROUP 7B23165
GROUP 7B3165
HASTINGSCB36
INSTALLER EDGEBA6592
INSTALLER EDGEBA6592
KENDALLB3165
KRALINATORLA1443
LUBER-FINERAFB7844
MIGHTYAFB7844
MIGHTYFA3165
MOBILB3165
MOTORCRAFTFA-1118
PRO GAUGEFA-768
PUROLATORB23165
QUAKER STATEB23165
QUAKER STATEB3165
SERVICE 154312
SHELLB3165
UNOCALFB676
WARNERAFB7844
WIX66501
