I have an automotive application. OEM "rubber" hose on this engine often fail. After several years the manufacturer replaced it with solid line. Earlier year owners often swap out the rubber for the later year solid. This is too involved for me right now, so i was just going to get the best high temp high pressure "rubber" hose and good clamps and inspect it often. Then i thought maybe some Wire braided hydraulic hose? I know that then my end clamps would really be my weakest component, so maybe im going way over kill here. In this application the hose is located between engine components with not much air movement and is also subject to pvc gases. This is for rear VVT-i hose on toyota 2gr-fe engines which they use in many car models. Im dealing with a 2007 avalon which from what ive read is the most involved when replacing the entire line with solid. There are additional reasons that id rather not replace entire line now. Thoughts? Tks, pa
PCV gasses? as in the Positive Crankcase Ventilation system? or is this an oil pressure hose? or some other application?
Oops im lysdexic. Yes PCV. Toyota in their recall stated that excessive PCV gases could contribute to its failure.
PCV (positive crankcase ventilation) hose will not be subject to any high pressures (unless the pcv valve fails), just high temps and fuel/oil gases at crankcase temps, unless it comes off of the EGR system. Unless things have changed much in engines since I was a mechanic, a simple chemically resistant and heat resistant hose should suffice. Any Napa store should carry what you need and have it in bulk, or other name brand auto parts store. I've been away from auto mechanic work for quite some time but I don't see a crankcase holding much more than 5-10 psi over atmospheric pressure. Even a diesel with heavy blowby should not generate excessive pressure unless there is a restriction.
http://media.fixed-ops.com/toy_campaigns/90k_dlrltr.pdf see Q1a at above
Paulmars, Thanks for posting that Toyota recall so we could see what you are talking about. Apparently, you don’t want to use another Toyota hose. I recommend going to a Parker dealer and purchasing a piece of Parker 801 Push-Lock. That stuff works great for oddball projects. Any idea what the inside diameter is? 5/8” maybe? Of course, your car will be metric, so you may not get a good match-up using bulk industrial hose. Grab a couple of stainless steel work drive clamps while you are there.
Needs b 3\8" id or slightly less. Pipe it goes over measures exactly 3\8" od. Yea metric. I prefer metric and use it whenever i can, but for some odd reason whenever i measure diameters i default to inches. Work drv? Do u mean Worm drv? That site says use with Compatible Fittings: • 82 series fittings • HY series fittings I quick search u tube dont show me how those fittings work, but i can do a better search tomorrow from my computer. That pipe it goes over is pitted on top and where u see it bending on top, its not round. Feels lik it was flattened slightly when hand forming the bends, which i know they don't do in this type of mass production, but it sure feels that way. The front VVT-i unit is solid pipe and it's way pitted. The entire alum block looks seriously oxidised. However, it wipes off way easier then any alum oxidation ive ever experienced before.
Air conditioning hose is heavier duty and can be clamped
Paulmars, Don’t worry about using the pushlock fittings with the hose. You don’t need them. Just clamp the hose. Since you say it’s 3/8”, it’s probably 10mm. 3/8” will work fine. Close enough. Regarding clamps, since you are dealing with 3/8” hose, I would use NAPA Balkamp Part #: BK 7051225 - 3/8” Fuel injection hose clamps. They will seal better and be less likely to chew up the hose like a worm drive.
With Parker 801 Push-Lock hose? Can that be compressed with a clamp? Why is that better then std Wire braided hydraulic hose?
I'll jump in here and just say you do not need the wire for strength and the rubber compounds used in the good Parker(or other hose like Aeroquip) are the same. And even the low pressure Push-Lok hose is good for 235 psi! If your pcv system is higher than that I'd be running for cover!
This is NOT pcv pressure. Its VVT-i oil pressure.
Well I was going by this statment in post #3: "Oops im lysdexic. Yes PCV. Toyota in their recall stated that excessive PCV gases could contribute to its failure." Guess one would need to have an idea of the pressure this hose has to handle before making a judgment on what to replace it with to be safe. Not knowing anything about the systems on a early 2000's Toyota I can't say for sure. It would take someone with some access to the Sys. Op. section out of the service manual to know. Or if on had an old hose that they could cut throught the bad hose and see what nkind of reinforcing it has to guesstimate what would work as the replacement. If you were to cut through the hose and find only one layer of fabric reinforcing then the Push-lok hose would be a good product to use. Now if you were to find five layers of steel braid reinforcing it then that would be a real different story!
I dont think it's that much higher then std engine oil pressure. Whatever that means. Ive read several articles on the VVT-i system and some say the small dia piping increases the pressure.
Small diameter piping does not increase the pressure. If it's driven by the engine oil pump, then it's at engine oil pressure as far as I can guess. I would never do a wire type hydraulic hose for this application unless it's crimped on. It would be a pain to get onto those fittings, and isn't needed. Replacing with a good quality equivalent to what was original should outlast the car easy.
Well then some people are wrong! If the pump supplying the oil puts out, for argument sake, 80 psi and has a relief valve that controls that pressure. Then it does not matter how small or big the line is you are never going to get anything over 80 psi. Now if you put a very large diameter line on there for the oil to flow out then you might lower the pressure in the line "if" the line dumps to atmosphere with no restriction at that point.
who makes the best strongest rubber oil line automotive hose? Best clamps?