| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,094 Posts1,056,487 Members48,444 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | 
#84308 10/15/2007 5:16 AM | Joined: Sep 2007 Posts: 31 New Guy | | New Guy Joined: Sep 2007 Posts: 31 | Howdy fellow bolters! I've got a quick question regarding the oil bath air cleaner on my 53 6400's 235. On the (for lack of a better word) lid of the air cleaner there is a steel fitting that comes up and turns 90 degrees and faces back toward the fire wall. It looks like a vacuum hose or something goes on it but the motor has no PCV valve. My dad and I thought it might go to the rubber hose that runs through the firewall and into the cowl vent, but it was just a guess. Anybody else run into an OBAC like this or have any ideas? Thanks for the help! | | |
#84309 10/15/2007 5:28 AM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Jake,
I don't know where this fitting attaches, but I do know it doesn't connect to the drip tube from the cowl vent.
It's possible that this air cleaner was originally on a different rig that had some sort of crank case breather system.
Stuart | | |
#84310 10/15/2007 8:44 PM | Joined: Sep 2007 Posts: 31 New Guy | | New Guy Joined: Sep 2007 Posts: 31 | Stuart,
Good thing you told me what that cowl tube was for. It really would've sucked if it was still attached to the air cleaner and the cowl was open during a good rain...*shudder*. Thanks for the info on the fitting! | | |
#84311 10/15/2007 8:48 PM | Joined: Feb 2004 Posts: 29,833 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,833 | That's probably the "clean air" fitting that was attached to a hydrovac brake booster. I've seen some of the hydrovac brake systems with about a 3/4" or 1" hose attached to the breather to prevent dusty air from entering the brake booster.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | |
#84312 10/16/2007 3:47 AM | Joined: Mar 2006 Posts: 483 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 483 | That air cleaner was proably on a motor that had a pvc system and would have connected to the valve cover. SEC 0 SHEET 4.00 of factory assembly manual | | |
#84313 10/16/2007 4:14 AM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Jake,
I'll bet if you look behind your seat you will see a tube coming up through the floor. It has a small air cleaner affair on its end. It's the breather from the atmosphere side of the hydrovac.
If you can't see it, you can hear it! With the truck shut off you can pump the brakes and hear it 'huff'.
If wouldn't seem like they would plumb this into the carburetor as it might tend to provide a little vacuum, and this side of the brake diaphragm is suppose to be neutral. Does this sound right?
Stuart | | |
#84315 10/17/2007 12:58 AM | Joined: Sep 2007 Posts: 31 New Guy | | New Guy Joined: Sep 2007 Posts: 31 | Denny,
That air cleaner is nearly a spot-on match to what I've got sitting on top of my 235. If it was indeed for a newer hydrovac I'll jut block it off and go about my business. Thanks for the input, everyone! | | |
#84316 10/17/2007 3:19 AM | Joined: Nov 2001 Posts: 481 Shop Shark | | Shop Shark Joined: Nov 2001 Posts: 481 | That fitting was designed for a PCV system as
Beaver 53 posted. | | |
|
|
| |
