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By monarch - 10 Years Ago
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Hi A friend has a 1956 Ford with a 292. He has very little blow by out of the breather but has blow by has oil dripping out of the downdraft. He changed the filter and still drips. Any possible causes.Thanks
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By Rono - 10 Years Ago
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The road draft tubes in the early Y Blocks were just in a bad location. Placed too low in the crankcase. That's why they developed the valley pan breather design. I guess the ultimate solution for the 56 blocks in my opinion would be to remove the breather canister assembly and use a block off plate. Then replace the stock valley pan with a later year or after market valley pan that has the PCV hole in the top.
Rono
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By 57RancheroJim - 10 Years Ago
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The road draft tube has a small drain back tube inside to return oil to the crank case, be sure that isn't plugged up.
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By paul2748 - 10 Years Ago
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It's probably best to remove it and thoroughly clean it. There is a sort of filter inside that can get clogged up and should be replaced if so.
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By 2721955meteor - 10 Years Ago
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the nut on the breather is on a thin piece of tin,if it has bin over tightend it will bend then not enough presure to seal the gasket. take it of and with no gasget make sure the cover is seated if it does not fit the can you need to bend the nut so ther is good tention when asembled with a gasget,these breathers ar not the highlight of ford engineering. good luck
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By PF Arcand - 10 Years Ago
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Check out all of the above mentioned possible causes. Also remove the oil filler cap & check the filter screen. It's the only air input for the crankcase venting on stock engines. If it's plugged up with dirt & oil residure, it will contribute to pressure buildup in the crankcase..
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By Aaron - 10 Years Ago
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I just rebuilt A 312 because of oil running out of the rd tube, it did need an over haul, but is this common of them to drip out of the rd tube and if so what is the later valley cover off of with the pcv valve.
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By PF Arcand - 10 Years Ago
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The reasons they may leak has already been covered.. However, some very late Y engines had a PCV setup, but some engines such as in T.Birds had the rear valley downdraft tube earlier. That valley cover can be modified by removing the tube & installing a PCV valve setup. Minor modifications to the valley cover are needed to install the grommet & valve.. However, the baffle underneath should be retained, to avoid drawing oil into the PC valve
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By Aaron - 10 Years Ago
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OK, this brings to mind another question, the previous owner put this 312 in a 2 ton truck, from what I could tell they used a bunch of truck parts to make fit, I found a reciept for what I think is a long block, the numbers don't seem to come up at the dealer where it came from, so most of the 272 parts were used to hack this together, I've got most all of that straightned out,but is the valley cover different from the one on here, this one just has the tube to put oil in and nothing else, I cleaned the filter and the road tube but noticed that it is strangely built,the drain back tube leaves oil in the housing as it is higher than the bottom of the bowl.
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By Small block - 10 Years Ago
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In place of the road draft tube What we did in the 64 half ton was to install rubber grommets into the Valve cover and a pipe into the exhaust header! I went to the Auto wreckers and picked up two anti reversion valves to install into a rubber hose that I run from the valve cover to the header
I have been using this method on my drag Cars for years and have had good results! I know this is not an option for the guys that are trying to keep the car pure stock but it does keep the pressure out of the engine1
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By 57RancheroJim - 10 Years Ago
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The valley cover with no road draft tube or PCV was pretty much standard until 1961 ( not sure about Birds ). In 1961 they came out with a new block casting that didn't have a hole for the road draft tube. So 61-64 valley covers have that provision. I'm using one from a 62 truck on my 57 292 that has the PCV valve in the valley cover and a block off plate were the road draft tube was.
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By wlj1943 - 10 Years Ago
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The mesh "filter" inside the canister is there by design catch oily vapors and ultimately it will run down into the drain hole. Problem was it often was plugged by sludge, and moisture; many a can I removed back in the day was just a mass of goo and rust. PVC valves are a lot kinder to engines as ventilation always occurs. Road draft tubes worked OK in the country; not so in the city for reasons already discussed.WLJ
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By Aaron - 10 Years Ago
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I have another question, if you removed the RD tube and built the plate with a threaded boss and ran a tube with a PCV on it to the intake would that work, reason I ask is I'm also swapping a 261 in place of a 235, both scrub, and the 261 has a canister similar to the 235 but it is set up for a PCV.
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