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Farmall & IHC Tractors Discussion Forum
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Anyone put a PCV valve on a 706 or other tractor.

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Adam

11-06-2003 16:04:22




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I am wanting/needing to put a PCV valve on my newly aquired 706. Water was and does build up in the engine.

ANyone done this? Anyhint? My plan is to use the small port/plug above the carb and get a PCV valve for say a Chevy 250 engine.

ABW




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andy

11-09-2003 19:22:16




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 Re: Anyone put a PCV valve on a 706 or other tract in reply to Adam, 11-06-2003 16:04:22  
From my prospective you do not need a PCV valve. The crankcase is already vented to the outside. Blow-by from the cylinders pushes all of the water vapor and contaminates out. A modern car or pickup uses a "closed" crankcase ventilation system. Like you are thinking a car has a hose from the valve cover to the intake manifold which sucks blow-by combustion products back into the cylinders to burn them again. This was actually done to clean up engine emisions by making it more of a closed system. The PCV valve does nothing but to act as a "one-way" valve or "check valve" to keep fires or explosions from occuring in the valve covers/crankcase should the engine backfire up into the carb. If you get the engine warm enough water vapor will mix with the blow-by and be exhausted out of the tube. The engine should warm up fairly quickly even without a load. I have a 706 gas and I believe the blow-by tube is on the operators right hand side attached to the tappet cover and discharges behind the side rail. Just my thoughts. Goodluck.

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Bob M

11-06-2003 16:26:14




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 Re: Anyone put a PCV valve on a 706 or other tract in reply to Adam, 11-06-2003 16:04:22  
Adam - I've never tried putting PCV on a tractor. I've thought about it myself and can see no reason why it would not work. Just size the PCV valve to match the displacement of the tractor engine. So if your 706 has a 291 cubic inch engine (?? - going from memory here….) recommend a PCV for a Chevy 300-6 truck or 305-V8 car. Connecting the PCV outlet to the manifold fitting above (downstream of) the carburetor is fine. Recognize you'll probably need to readjust both the idle and power screws on the carburetor as the addition of the PCV leans the mixture slightly.

However if you're getting condensation in the engine and the engine is otherwise in good shape (no coolant leaks, etc) it means the engine is running too cold. In this situation even an effectively working PCV will not cure the condensation. Solutions: Install a hotter thermostat (180 or 192 deg). Use a winter front to cover the radiator in cool weather. Limit engine idling time - if it's gonna idle more than a couple minutes it's better to shut it down.

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DaveWis

11-06-2003 18:38:40




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 Re: Re: Anyone put a PCV valve on a 706 or other t in reply to Bob M, 11-06-2003 16:26:14  
I agree with that but will add one thing, when you run it, make sure you get it good and warm as that helps dry out the condensation that accumulates. It may not be feasible to do every time, but as often as you can.



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