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No Oil Pressure, 1951 Model B

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Jim Hammel

05-12-2003 19:52:50




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How is the oil pump inlet screen removed for cleaning? Does it drop out the bottom after removing the round plate?
Also, how do I go about checking the top of the oil filter cannister, I understand this is a likely cause of low or no oil pressure? Will there be oil pressure if the oil filter is left out?
I'd appreciate some help, ran the engine with a crankcase full of gasoline, since than no oil pressure.
Put in new oil and oil filter and gauge is good. There is no oil flow to the gage.
Thanks! Jim H.

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Elton Fancher

05-16-2003 19:00:01




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 Re: No Oil Pressure, 1951 Model B in reply to Jim Hammel, 05-12-2003 19:52:50  
I do not think this is your problem but I have replaced 3 or 4 of the connectors that tie the camshaft end to the oil pump. This is usually caused by water at the bottom of the oil pump freezing, but I had one B that was spinning the camshaft rod in a worn coupler.



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Jim Hammel

05-13-2003 18:42:03




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 Re: No Oil Pressure, 1951 Model B in reply to Jim Hammel, 05-12-2003 19:52:50  
Thanks Clooney, F.I.T., and Bob for the feedback.
And Bob, The gasoline was not a plan, but a result of carelessness. Had just installed a new float and needle valve in the carb. Did'nt think I needed to turn off the gas anymore; turns out to be a foolish assumption, and you're so right, a very scary one!
Tomarrow, after work I'll check out the screen first, and go from there.

Thanks again

I'll let ya know what I find. Jim H.

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bob

05-13-2003 06:52:31




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 Re: No Oil Pressure, 1951 Model B in reply to Jim Hammel, 05-12-2003 19:52:50  
I'm curious, isn't running an engine with a crankcase full of gasoline a tad dangerous, not to mention a bit hard on the engine. Maybe it's impossible, but in my nightmares I see a little flame from a flooded motor getting past the piston rings and causing all kinds of bad things to happen. Or a little of the vapor getting into the mag and doing the same thing. I'd rather spend five days (I'm slow) tearing it down and cleaning it properly than to risk losing the whole rig.

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Clooney

05-13-2003 03:54:09




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 Re: No Oil Pressure, 1951 Model B in reply to Jim Hammel, 05-12-2003 19:52:50  
Jim, pull the oil pump out the bottom & you can get to the intake screen. You should also be able to reach down in the crankcase & feel around the filter inlet screen for crud & blockage.
~To check the oil filter can to filter head for a blown gasket & can distortion you can lower the engine oil level enough to be able to watch the filter head to can area, then crank the engine & watch for oil squirting out. OR, pull the oil lines & oil filter head & look at the top of the filter can [2 bolts come up from inside the filter can that hold that filter head on]. One sign of a distorted filter can top is a crooked oil filter cover stud that isn't centered in the can. There is also the possibility of a cracked filter head. Removing the oil filter element won't gain you anything as the filter can is what holds the oil in & the element only filters what goes through it.
~The good news is that just running with gasoline in the crankcase shouldn't have effected the filter can or filter head UNLESS you over-tightened the filter cover when you changed the oil.
~You could always rig a garden sprayer with a mixture of diesel & engine oil in it to the oil pump discharge line then pressurize the oil system & watch to see where all the oil is going, I suppose it’s possible you ruined the oil pump or scored the engine bearings with that gasoline. At least pressurizing the oil system will allow you to see where the oil pressure is going & if it’s going past the oil filter can top or engine bearings.

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F-I-T

05-13-2003 08:09:25




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 Re: Re: No Oil Pressure, 1951 Model B in reply to Clooney , 05-13-2003 03:54:09  
Clooney:

Is it possible that he has a glob of trash holding the by-pass valve open ? I saw this once before on a late "A", and I had to open the oil pressure adjusting screw as far as I could, then start it back in . That let the trash blow out from under the by-pass leaf spring, and then it was fine. You might be able to do this with just cranking the engine (plugs out,) with a helper.

Checking for trash on the screen is a good first check. They can accumulate lots of stuff down there over the years...nuts, washers, gasket pieces, even parts wrappers.

Frank-in-Tallahassee
70D // 855

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