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hello again! Based advice from forum members I'm looking hard at removing the road tube from my 292 in favor of a PCV system. I've done some research and it looks fairly easy; I'm going to tackle it myself. I have a few questions and appreciate your guidance. The attached photo from my parts manual has notations for each question. One general question: any reason I shouldn't do this?
It appears that other than parts 1, 2, and 4 the rest is just tubing and clamps. what are the items circled in 3? It doesn't show where they go, and I'm not sure if they are essential.
Part 2 seems to be an adapter that screws in to the front of the carb? The valley pan? I'm gonna look today and see what I can see. Also, a search for this part number netted nothing. Is this a common adapter that I can get anywhere, or do I need the real thing?
I've had trouble finding part identified in 4 ... do I need the original, or will something similar do?
As always I thank you in advance for comments, counsel and any help you can provide.
Part 2 is just a brass or steel fitting you can get at an auto parts store. It goes into the intake manifold just in front of the carb. I'm not sure if early 2V manifolds have that tapped port?
Part 4 is going to be harder to find.
Part 3, no idea.
You are better off with a PCV system, road draft tubes weren't the best.
If you are trying to cure the problem pictured in your Smoke thread. I don't think a PCV will fix that. That is a lot of blow by if you manage to suck all that thru the engine you will foul out the plugs before you get around the block.
If you are trying to cure the problem pictured in your Smoke thread. I don't think a PCV will fix that. That is a lot of blow by if you manage to suck all that thru the engine you will foul out the plugs before you get around the block.
thanks for the thought. I'm not sure this is a cure for the problem; but in the discussion several people brought up that the road tube is undesirable and I should consider the PCV system.
1963 had PVC from factory. 62 had road draft on rear of valley cover . Older had road draft on left hand side of block just above oil pan. PO installed older complete engine.
On a healthy engine, the PCV system must be set up with a good baffle and a PCV valve with the correct flow rate and open/close rate for your engine. Otherwise, it either doesn't do much or it sucks a LOT of oily snot through your intake and cylinders. In some cases, even with much newer engines, guys add a catch can to keep their intakes clean while still providing ventilation.
I glanced at your smoke thread where oil is getting all over the firewall. If that's what you're trying to correct then I don't think a PCV system will help. That may be caused by high crankcase pressure from excessive blow-by....hard to say. A leak down test may give an idea. All you need for that is a spark plug hole adaptor for your air hose. Crank it to 100 psi and listen for air leaks. Leak down test gauges are helpful if you don't mind buying a set or find a set to borrow,
The only problem I see with a road draft tube is they vent to the atmosphere. The PCV system is really only beneficial for an environmental reason. From an engine standpoint, I see no benefit of a PCV system over a road draft tube. My 2002 diesel pickup came from the factory with a road draft tube.
On a healthy engine, the PCV system must be set up with a good baffle and a PCV valve with the correct flow rate and open/close rate for your engine. Otherwise, it either doesn't do much or it sucks a LOT of oily snot through your intake and cylinders. In some cases, even with much newer engines, guys add a catch can to keep their intakes clean while still providing ventilation.
I glanced at your smoke thread where oil is getting all over the firewall. If that's what you're trying to correct then I don't think a PCV system will help. That may be caused by high crankcase pressure from excessive blow-by....hard to say. A leak down test may give an idea. All you need for that is a spark plug hole adaptor for your air hose. Crank it to 100 psi and listen for air leaks. Leak down test gauges are helpful if you don't mind buying a set or find a set to borrow,
The only problem I see with a road draft tube is they vent to the atmosphere. The PCV system is really only beneficial for an environmental reason. From an engine standpoint, I see no benefit of a PCV system over a road draft tube. My 2002 diesel pickup came from the factory with a road draft tube.
Thank you for the additional context. I'm not sure that my motivation is to solve that problem by a PCV system; I just understood it to be an easy improvement to engine performance.
The term "blow by" has been used in several posts and I've never asked what it means. Can you explain it to me please?
"Blow by" is excessive crankcase pressure created by cylinder pressure "compression'', that gets past the piston rings. The end product is smoke in the form of "oil vapor" that is seen coming from a draft tube, oil filler cap or any other path of least resistance from within the crankcase.
Yep, what lizardman1 said. All engines have a smidge of blow-by which is one reason they need some crankcase ventilation. Too much blow by makes a mess and reduces engine performance.
The PCV system or road draft tube sucks off these blow-by gasses to help keep the oil cleaner longer. The PCV system is supposed to help the environment by sending the blow-by gas back through the combustion chamber to make sure it's completely burned. PCV systems are legally required if the car came from the factory that way. In your case, I'd stick with the draft tube unless someone has a reason to switch to a PCV system.
Looking at the bad blow-by a PCV system at this point really won't help. Unfortunately you are probably going to need a rebuild and then add the PCV system at that time. You will also need to locate the correct push rod cover.
Looking at the bad blow-by a PCV system at this point really won't help. Unfortunately you are probably going to need a rebuild and then add the PCV system at that time. You will also need to locate the correct push rod cover.
do I have the wrong push rod cover? I don't understand ...
Yep, what lizardman1 said. All engines have a smidge of blow-by which is one reason they need some crankcase ventilation. Too much blow by makes a mess and reduces engine performance.
The PCV system or road draft tube sucks off these blow-by gasses to help keep the oil cleaner longer. The PCV system is supposed to help the environment by sending the blow-by gas back through the combustion chamber to make sure it's completely burned. PCV systems are legally required if the car came from the factory that way. In your case, I'd stick with the draft tube unless someone has a reason to switch to a PCV system.
@lizardman1 and @'65Ford okay ... I think I get it. So the point of the leak down test is to see where the "path of least resistance" is. Wherever the leak, it tells you what to fix. The PCV is more preventative than curative.
Of the possible leak points, are any of them an "easy" fix, or do I by definition need an engine rebuild if blow by is the source of my oil on the firewall?
Yeah, you can think of a leak down test that way. It should show you if you have leaking intake valves, leaking exhaust valves, leaking rings, or all three leaking. Get the engine to operating temp and make sure your truck is blocked so it won't move when you pressurize a cylinder.
I think "push rod cover" is the valve cover. I'm guessing you'd need a new valve cover if you switched to a PCV system. I don't know. I'm curious what reasons folks gave you that a PCV system is better than a road draft tube. You won't notice any measurable engine performance.
PCV system is only there to keep the oil cleaner by scavenging blow-by gasses. If it gets clogged then you might build up enough crank case pressure to push oil through engine seals and gaskets. But you don't have that, just a road draft tube. And the road draft tube does as good of a job scavenging crankcase blow-by gases as the PCV system.
I just glanced at your smoke thread again. It's normal to have white steam coming out of a road draft tube once the engine is up to temp. You want the engine to run 180 or warmer to drive moisture out of the oil. Moisture is in the blow-by gases. Anytime you burn anything...natural gas, gasoline, firewood, etc..water is a by-product. The PCV system or in your case a road draft tube pulls that moisture out of the crankcase.
As for all that oil on the firewall, you may just have a weird oil leak...though I'd think your mechanic could find that. Sure is a LOT of oil. Oil leaks usually dribble down the engine block and onto the ground or splash back to the tranny and on to the rear differential. What you have looks more like an oil eruption.
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PCV conversion questions
