Thats right, these are reusable fittings. You might be able to take them apart with a pair of Crescent wrenches, though that might depend on how old they are. As the inner tube of the hose ages, it will tend to bond to the metal tube inserted into it.
But this is only ¼ ID hose so the force should not be that high. BTW, the hose with fabric braid on the outside is fuel hose, not hydraulic. Hydraulic hose usually has rubber on the outside of the reinforcing braid to protect the metal reinforcement from corrosion. There are exceptions e.g. aircraft hoses with stainless reinforcement braid, and those shiny fuel hoses that make so many rice burners fast and furious. Since these are basically suction hoses they are under no significant pressure (less than about 50PSI is the standard for fuel hose IIRC, which is why you never see hose downstream of your fuel injection pump). The fittings are most likely 37 or 45 degree flare fittings. But if you will be reusing the fittings, it really doesnt matter which. Remove the fitting by holding the wrench flats on the ferrule on the outside of the hose, and unscrewing the fitting using the wrench flats next to the end of the ferrule. Once it is out of the hose, you should be able to unscrew the ferrule, by hand if you are lucky. To reinstall on a new hose, screw the ferrule down until it bottoms on the end of the hose (probably by hand). Dont do it so hard that you distort/compress the inner tube. Lube the ID of the hose with a little oil, and the OD of the tapered tube in the fitting that will screw into the hose (BTW, make sure you have cleaned the old rubber off the tube when removing it). Then you hold the ferrule in place and screw the fitting into the threads on the ID of the ferrule until it bottoms out. The tapered tube on the fitting will compress the rubber and the reinforcing fabric into the really course threads on the inside of the ferrule. The principal caution is to make sure that the end of the tube inserted into the ID of the hose does not cut into the ID of the rubber hose. Its really not rocket science. Once youve done it, youll be an expert. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Danny Haughey via CnC-List Sent: Monday, April 25, 2016 10:44 AM To: cnc-list@cnc-list.com Cc: Danny Haughey <djhaug...@juno.com> Subject: Re: Stus-List Diesel fuel lines questions I think Rick has it. I found something that looks identical on ebay. Rick, are these indeed, reusable? They do seem to be as the only thing that gets compressed is the hose between the ferrule and the insert fitting Danny On 4/25/2016 10:33 AM, Rick Brass via CnC-List wrote: The SAE standards for hose generally call for the hose to be marked with the ID of the hose so 5/16 hose is nominally 5/16 ID. This is unlike tubing and pipe, where 5/16 is 5/16 OD. The exception is SAE type 5 hose (I think it is supposed to be marked with the SAE standard 1005 on the layline of the hose). Type 5 hose is called tubing size and the ID of the hose is the same as the ID of the same size hydraulic tubing. So 5/16 type 5 hose is a bit under ¼ ID, and something like 7/16 OD. It is hydraulic hose rated at 5000 PSI or so, and is not fuel hose. Type 5 hose was originally created for use in aircraft during WWII, because you would not want to carry around the weight of metal tubing and the extra fluid contained in a larger ID hose plus hose was a lot easier to inventory and replace than metal tubes on military airplanes being repaired around the world. Fuel hose is basically type 1, IIRC, rated to something like 1000 PSI. Made with an inner tube that is resistant to fuels and most solvents (though not all). The reinforcement is made to allow the hose to be more flexible and have shorter bend radius than hydraulic hoses. It also will work as suction hose, which many types of hydraulic hose will not. Never use anything except fuel hose in fuel system applications. Rick Brass Washington, NC I didnt stay in a Holiday Inn last night, about 30 years ago I was an engineer for Aeroquip. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Charlie Nelson via CnC-List Sent: Sunday, April 24, 2016 10:44 PM To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> Cc: cenel...@aol.com <mailto:cenel...@aol.com> Subject: Re: Stus-List Diesel fuel lines questions A word of warning--these hoses are notorious for variations between the OD and ID so do not assume that if your hose is marked 5/16" on the outside that the inside diameter (ID) will match your fittings. Depending on your hose source, a 5/16" OD hose could have a variety of IDs--some wall thicknesses are greater than others but this number is often not noted on the outside of the hose. If the hose is going on barbed fittings, some to this can be made up by the hose clamps (double always IMHO). However, a thick-walled 5/16" hose may never go over a 1/4" barb fitting. Charlie Nelson Water Phantom C&C 36 XL/kcb cenel...@aol.com <mailto:cenel...@aol.com> _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
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