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| | | Supreme Being
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the circled part is what my mechanic said i need to change around, the guy before me had his own little vaccum line thing hooked up i guess and welded that off. what is that exactly and how do i go about fixing that?
my dad doesnt feel like helping me anymore so im pretty much on my own
so i wanna know what that is and how to go about fixing it?
IT LIVES!
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| | | Supreme Being
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| how about more pics?
55Birdman |
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| | | Supreme Being
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| | | Supreme Being
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| | Looks like parts of a "homemade" positive crankcase ventilation system (PCV). There is also a hose on the front standpipe of the valley cover. Must have been attached to the air cleaner. That engine originally had a "draft tube" to suck the smoke out of the crankcase - that's what was welded shut. California emissions right? Probably had to retrofit a closed system somewhere along the way to your house. Up to date version would be a port on the engine (usually LH rear on the valley cover) where a hose runs out an elbow - feeds to a PCV valve and into the intake manifold. The engine then burns the oil smoke. The PCV valve is a basically a "check valve" that prevents an engine backfire from pressurizing the engine crankcase. The system has to have clean intake air to keep internal vacuum down and crud out of the crankcase. The clean air comes through that front standpipe - and from that hose to the air cleaner. The PCV air "leak" into the intake manifold is just like opening up the throttle plate of the carb. Usually you can detect a "speed up" - "slow down" from blocking and unblocking the PCV. Should be on there and working when you are tuning the idle circuit.
Steve Metzger Tucson, Arizona
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Supreme Being
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| Looks like either some kind of 'side-oiler system' or crankcase ventilation system.
*QUESTION*: Where are all those hoses going?
The hoses running everywhere are not stock. What looks to be welded shut I think is the road draft tube (my truck has the PCV system, so I'm not that familiar with a car road draft system).
But it may be an add-on oiler since Y's didn't have real good stock oiling systems. WHEN YOU HAVE THIS MOTOR RUNNING AGAIN, MAKE SURE YOU HAVE OIL GETTING UP INTO THE VALVE COVERS. Yes, I was yelling as I know you young guys don't hear well (old guys CAN'T hear well  )
Good luck and keep asking questions.
Patients, persistence, time .... and a little cash. |
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| | | Forum Guru
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| I have the block off plate on mine and even my old 239 had that port blocked off.
In the aviation world we would call that "canister/vent" an air/oil separator. It basically condenses the oil and allows (most of) it to run back into the engine. If it wasn't there it would vastly increase "oil consumption" although the oil is not consumed as it is vented overboard as a vapor.
I really like the idea of having a PCV. Sure gets rid of the oil "stench" under the hood!
Rick
1955 F-600// Disclaimer: No animals were injured while test driving my F-600 except the ones I ran over intentionally! |
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Supreme Being
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| Discussion re: PCV systems always reminds me how little data is readily available for fine-tuning one. While we all love the extended oil/engine life (plus the elimination of noxious fumes/oiled chassis), in the end, blow-by gases and vaporized oil are really no substitute for a high octane mixture, which is likely the reason race cars sometimes have crankcase evacuation vents plumbed into the headers?
6 VOLTS/POS. GRD. NW INDIANA |
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| HT32BSX115 (6/28/2008)
I have the block off plate on mine and even my old 239 had that port blocked off.
In the aviation world we would call that "canister/vent" an air/oil separator. It basically condenses the oil and allows (most of) it to run back into the engine. If it wasn't there it would vastly increase "oil consumption" although the oil is not consumed as it is vented overboard as a vapor.
I really like the idea of having a PCV. Sure gets rid of the oil "stench" under the hood!
so your saying i should keep that welded on there and run the setup the guy had on there before me??
IT LIVES!
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