Downside To Deforming Head Hose?

[Delancey]

In particular I am looking to heat gun some 1-1/2" Shields VAC HX to make a connection with a 1-3/4" fitting. My question is whether anybody can explain to me what this real downside of this is?

I read specs on similar hose, also a coextruded type, which I believe advised specifically against heating. This doesn't make any sense to me as heat is a part of the manufacturing process. Is it possible that this advisement is just CYA by the manufacturer?

Elsewhere on the boat similar connections have been made which if I had to guess are five or ten years old and show no signs of failure.

Also, any thoughts on the best head-hose lube? I have used lanolin in the past but wonder if there is something better?

Cheers

[sailvayu]

Heating and stretching the hose can cause thin spots which could lead to leaks. It is hard to heat evenly and will not stretch evenly. That said if you keep an eye on it you may never have any problems.

[model 10]

Hot water works better than a heat gun for some reason. Maybe the even heat but it tends to not split the hose as often. Silicone works better than Lanocote.

[a64pilot]

There is an "expander" made to expand exhaust pipe so that one can fit over the other, should work well for this purpose should you desire to expand the pipe.

[Delancey]

Originally Posted by a64pilot

There is an "expander" made to expand exhaust pipe so that one can fit over the other, should work well for this purpose should you desire to expand the pipe.

Great tip, you saved me a lot of potential micky-mousing around. Most appreciated!

[model 10]

Originally Posted by Delancey

Great tip, you saved me a lot of potential micky-mousing around. Most appreciated!

The problem with that tool is the hose will shrink back to it's old size before you can get it on. It's not really made to expand the exhaust pipe but to remove any deformation in the female part of the exh pipe joint. If you could get the hose to take a set with heat while the expander is inside, maybe.

[Delancey]

This is exactly what I had in mind before a64Pilot told me what it was, so thanks for that!

I have used similar tools for different materials and purposes. It should work. Might be best to do it in steps. I have plenty of hose to mess around with. Pictures if it works out.

[leftbrainstuff]

Fit the right size hose to the right size fitting using the right technique.

Sent from my GT-I9300 using Cruisers Sailing Forum mobile app

[FlyingCloud1937]

This is the right tool for the job.

Vetus Hose adapter.



Lloyd

[a64pilot]

Originally Posted by FlyingCloud1937

This is the right tool for the job.

Vetus Hose adapter.



Lloyd

This is certainly a better method,much less chance of a bad outcome, even if it does put another joint in the system. I have expanded hose in the past though, sometimes auto parts stores will loan tools for free.

[Delancey]

Agreed about the using the right size parts, also agreed about putting another joint in the system which was my point to wanting to try expanding it.

The fact that there is another successful connection elsewhere on the boat made at the same size with the same materials gives me pause to consider it worth the attempt. I've got the hose to play around with and there is a car shop down the block that will loan me the tool.

I am worried about the hard spot on the end of the tool causing a thin spot in the hose but figure by taking my time, doing a couple steps, and moving the tool around I might get decent results.

The guy before me did it, my guess is he did it in a similar fashion and five or ten years later no problems, so we will see what happens.

[FlyingCloud1937]

Well it's a fairly big risk if this is a below the water fitting, and or a head hose.

The risk of a properly sized hose and a couple of non serrated AWB clamps per fitting, is the least likely failure mode.

Lloyd

Originally Posted by Delancey

Agreed about the using the right size parts, also agreed about putting another joint in the system which was my point to wanting to try expanding it.

The fact that there is another successful connection elsewhere on the boat made at the same size with the same materials gives me pause to consider it worth the attempt. I've got the hose to play around with and there is a car shop down the block that will loan me the tool.

I am worried about the hard spot on the end of the tool causing a thin spot in the hose but figure by taking my time, doing a couple steps, and moving the tool around I might get decent results.

The guy before me did it, my guess is he did it in a similar fashion and five or ten years later no problems, so we will see what happens.

[Terra Nova]

Originally Posted by Delancey

In particular I am looking to heat gun some 1-1/2" Shields VAC HX to make a connection with a 1-3/4" fitting. My question is whether anybody can explain to me what this real downside of this is?...

Since you haven't provided enough information, it isn't possible for us to judge the downside potential.

But I am really curious why you seem to often look for a way to Mickey Mouse something, rather than repair it correctly?

[model 10]

[QUOTE=Terra Nova;
But I am really curious why you seem to often look for a way to Mickey Mouse something, rather than repair it correctly?[/QUOTE]

If you ever go cruising , perhaps you too will join the Mickey Mouse Club. It becomes a way of life. Sometimes despite your best intentions.

[Terra Nova]

BTW, a few drops of liquid dish-washing soap are usually all the lube that's needed.