Air breather |
Post Reply |
Author | |
AlfaDon
Senior Member Joined: September-18-2011 Location: San Leandro, Ca Status: Offline Points: 392 |
Post Options
Thanks(0)
Posted: September-26-2019 at 9:19pm |
I want to change the air breather that’s on the valve cover of my 351W. It it possible to rotate it to change the breather hose orientation? Or, is it ok to remove it and use a breather that sits on top of the valve cover, one that you can pull out to fill the engine oil? Is it a problem to vent the blow by gases into the dog box instead of the hose that sits in front of the spark arrestor?
The current hose configuration blocks my view of the fuel pressure gauge Thanks Don |
|
8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
|
Don,
I feel it'd best to relocate the gauge rather than mess with blow by. |
|
KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
Post Options
Thanks(0)
|
You must be talking about the oil fill pipe with the hose that goes from the side of the pipe over to the flame arrestor. I don't see any problem with rotating it if you can or removing it and just putting a breather/fill cap in it's place . If you look at a diagram of how the PCV system works, air goes into the engine through that tube or cap and ends up carrying blowby gases through the PCV valve back into the intake manifold Depending on PCV valve condition, the amount of blowby, and engine vacuum, blowby gases can come out of the breather/fill cap instead of clean air going in. If you google "PCV system" you'll find various explanations of how the system works The automotive system draws air from inside the air filter to get clean air without dirt,sand etc flowing into the engine. The marine system on a PCM 351 draws air from outside the flame arrestor since you really don,t have to worry about dirty air Another reason I figure it should work is one of my boats has the fill cap/breather setup with no hose running up to the outside of the flame arrestor along with the normal original PCV valve setup and there were no differences in how it runs as compared to the original setup. I'm not sure on long term affects, it's only gone a few thousand or so hours this way Why are you still looking at fuel pressure? I thought your new pump and overflow line hookup had it running good. I never tried to rotate that tube, but I have an old valve cover with that tube and I can try to rotate it in the morning and see if it turns easily, breaks or just refuses to move. I'll let ya' know |
|
KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
Post Options
Thanks(0)
|
Don
If what you have resembles what's in the picture, it will rotate. I had to delicately use a pipe wrench for some leverage but nothing broke or twisted. And I even rotated it back to it's normal position again |
|
AlfaDon
Senior Member Joined: September-18-2011 Location: San Leandro, Ca Status: Offline Points: 392 |
Post Options
Thanks(0)
|
Thanks guys,
Pete, I understand you concern. That’s why I asked. I can put a 45* fitting behind the gauge and it should Move it out of the way enough to accomplish what I’m trying to do. Keno, My filler looks just like yours. I tried rotating mine with a pair of channellocks and despite being cautious all I did was put a dent in the neck. I finished modifying my spark arrestor to accommodate the vent hose. I’ll post a few pics to the other thread later tonight. |
|
KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
Post Options
Thanks(0)
|
You obviously need more practice at "delicate brutality" |
|
KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
Post Options
Thanks(0)
|
Don
I stumbled into this picture of a 302 Ford in a Tique with just the breather cap and no hose up to the flame arrestor. like I mentioned earlier. I just can't for the life of me remember who it belongs to, Pete might know Like I mentioned, I have an engine set up the same way |
|
Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
Post Options
Thanks(0)
|
I think they did that with alot of older engines
|
|
Post Reply | |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |