Gerald Clabots
Well Known Member
Question for Rv 12 owners who have ordered Vans 5 year hose replacement kit. Did you receive some 5/8 I D hose in your kit?
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Rv 12 Hose replacement Kit from Vans
- Thread starter Gerald Clabots
- Start date
Just wrapping up my 12iS hose replacement. I bought the five hoses that attach to the expansion tank from Lockwood, and sourced the lower ones separately, since they’re just straight hoses. I hope you went with the silicone hoses. This was a job I don’t EVER want to do again. Got 1” and 16 mm (5/8”) silicone heater hose off Amazon.
And don’t forget about the fuel-pump assembly hoses too. They’re 5-year life limited too. There’s a kit for that replacement.
And don’t forget about the fuel-pump assembly hoses too. They’re 5-year life limited too. There’s a kit for that replacement.
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We've thought about the coolant hoses on the Rotax engines for several years. For me, it would be a great companion for our teflon hoses. But getting real samples of the original coolant hoses would be needed so we can determine the actual dimensions, especially the bent, molded versions. HPS Performance in California, and Pegasus Racing has pre-bend molded silicone hoses---i'm sure there are other sources too. Pretty easy for the builder/owner to cut to fit these.
Piper J3
Well Known Member
I replaced all the coolant hoses with High-Performance Silicone Heater Hose…. no molded hoses are required. The 5/8” hose that feeds the top of cylinder #3 has an external Heater Hose Shaping Coil to hold a uniform sweeping bend. I did the work four years ago at 630TT and now have 930TT with no problems...
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Getting ready to replace coolant hoses…are all the hoses 5/8”ID? Do you recall how many feet of HPS Silicone heater hose you need? Did you reuse the hose clamps? Any info appreciated, not a builder, third owner..
That shaping coil you referenced above, where is that sourced?
Thanks
Piper J3
Well Known Member
That's good news! I wonder what sizes they are?
Just a "cautionary tale"...
I replaced my water hoses last winter/spring and tried to use silicone hoses based on the research and experiences of other members in the this forum.
Man, I just could NOT stop those silicone hoses from leaking at the connections!
There were 2 things I could think of that might be the cause:
1) the only silicone hoses I could find (vendors recommended by the others) were 'Merican size (5/8?) which was just a teensy bit larger that the OEM size from Rotax (was it 16 or 17mm?), and
2) the constant-tension clamps from the original installation would not enlarge enough to fit over the silicone hoses which had a larger outside diameter. The clamps have/or had a "stop tab" on them that limited the amount they could be spread open. Probably to prevent them from being overstretched. I had to grind off just a bit of the stop tab so they'd fit over the silicone hoses. This was also mentioned by another poster. Doug (I believe it was) said at the time that the clamps could be reused. He didn't mention the modification, maybe others found a way. Anyway, that's what I had to do. I REALLY wanted those silicone hoses to work!
Note: Van's did not offer their own kit at the time (they introduced it just after I'd bought my own).
Ultimately I removed the silicone hoses, ordered the Rotax hoses from Lockwood and started over.
At long last NO LEAKS!
Glad Van's has a kit now. I hop it's silicone, and I hope others have a better experience than I did trying to "roll your own".
YMMV
Clear Skies!
Thanks Dave, your experience is important to hear. I have been using the Rotax hoses as furnished with the motor. Still not convinced silicone is the way to go for several reasons including the clamps. If Rotax offers a silicone hose then I would be more acceptable to the idea. BTW, there may be some misunderstanding about the Vans Hose kit. That kit supplies only the Van’s supplied rubber hoses used firewall forward and does not include the 17mm engine hoses. The hoses in the Van’s kit have NAPA part numbers and can be sourced at a NAPA auto parts store.
Thanks Tony for the clarification about what is-and is not- in the Van's hose "kit"!
I did indeed get the "bulk" hoses from NAPA.
I bought the Rotax hoses from Lockwood. Not as expensive as I had feared and the time I spent screwing around to buy and ship silicone hoses was not worth the trouble much less trying to make them fit, trying to stop the leaks and then remove them again to install the Rotax hoses. I'm getting quite good at it now! <lol> and BTW, I'm an LSRM-A now in case anyone within reasonable distance from North Florida needs it done or needs help.
Lastly, If some of the fellows have had better luck with the silicone hoses then good-on-'em! That's how we all learn.
I just decided that the peace of mind using the Rotax hoses is better for me. I have no desire for an off-field landing in alligator and rattlesnake country!
rcarsey
Well Known Member
They do offer silicone hoses. You'll pay through the nose for them. See the latest Illustrated Parts Catalog and turn to page 84 (Chapter 75-20-00 Page 67). Note that they call for a different size clamp for the 4 connections at the expansion tank (one size bigger).
The entire set, 9 hoses, is .. (Lockwood pricing) $972 vs non-silicone at $268.
$$$$ Wow. Thanks Rob. After my experience noted earlier I'd gotten quite good at removing/installing the hoses. For the price difference I'll stay with the originals.
Besides, its a good idea to get a relatively unobstructed look at the top of the engine every few years.
For the iS, if you just buy the five formed Rotax silicone hoses that connect to the expansion tank, it ran me just over $400. The lower coolant hoses can use stock straight silicone hoses, so under $500 to go with all silicone, which was worth not having to repeat this task. The fuel-pump service kit was another $113.
But I’m still looking for input from someone who has replaced their airbox connecting hoses and can share how they accessed the nut holding it down? It’s really buried under harnesses and the engine mount.
But I’m still looking for input from someone who has replaced their airbox connecting hoses and can share how they accessed the nut holding it down? It’s really buried under harnesses and the engine mount.
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sansoneservices
Well Known Member
The "shaping coil" is just a 5/8" diameter spring to prevent kinks in sharp bends. The aircraft section of Ace Hardware should have it
I did this about 1100 hrs, 4 years ago. https://vansairforce.net/threads/5-year-rubber-alternatives.186607/post-1470744
rcarsey
Well Known Member
Bob, looks like you might have to remove the center two sensors in order to remove the wire strain relief bracket before you can get to that M6 nut below.
Are we sure that "connecting hose of the air intake system" means those two hoses (plural) connecting the airbox to the intake manifolds? They're rubber.. and I guess subject to degradation..
The only other singular "hose" I found was the one that connects the fuel pressure regulator to the side of the airbox.
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Unfortunately, yes, they are. I verified with Lockwood. And I too noticed the hose connecting the fuel-pressure regulator to the airbox. Not sure why it’s not on the replacement list either, but I got some 4 mm hose on Amazon I plan to use for that replacement. Couldn’t justify the Rotax price for less than a 3” hose. I’ll be taking on this project in another 13 hours of engine time, so am hoping to hear from someone who’s already blazed the trail. Also replacing the fuel-pressure regulator with the Bosch device for $21 vs. the Rotax for $380, which is the Bosch regulator. Pretty egregious, isn’t it?
