Hydraulic Steering Line Repair

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PennBruce

PennBruce

Senior Member
Joined
Apr 12, 2021
Messages
208
Vessel Name
Last Hurrah
Vessel Make
Ta Chiao/CT35 Sun Deck
I was drilling a hole in a locker and damaged one of the hydraulic steering tubes.

Steering Hydraulic Line.jpg

The view is from the engine compartment looking up at the floor of the locker. As you can see the drill bit did a nice job on the tubing.

Searching the forum indicates that the fix is to piece in a length of tubing with compression fittings. The tubing is 3/8 inch.

My only experience with compression fittings is fitting bathroom sinks.

Suggestions and advice will be appreciated.

Bruce
 
It’s bent. It doesn’t look like it is kinked. I don’t see a leak in that photo. Not a lot of fluid goes through that and it isn’t high pressure.

If it is real easy to access it, sure, replace it. If no leaks or restrictions, why?
 
I agree, if it wasn't leaking I'd live with it. BTW, from what I've read in this forum, the pressure can be quite high when the rudder is hard over.

Bruce


Greg S said:
It’s bent. It doesn’t look like it is kinked. I don’t see a leak in that photo. Not a lot of fluid goes through that and it isn’t high pressure.

If it is real easy to access it, sure, replace it. If no leaks or restrictions, why?
Click to expand...
 
I don't see the hole but I see heat damage, corrosion and potential kinking. I would find the ends and re route and replace both lines. The instructions to bleed the lines are pretty simple. On my Hynautique system just repressurize the system and do about six complete lock to lock turns on the highest station. Yours may be different but not all that complicated.

pete
 
It's hydraulic, use flare fittings and tool, not compression fittings.
 
It is your steering and it can see 100's of psi of pressure so it is sort of important. I'd not advise a wait and see attitude. You want to use flare fittings and most hardware stores sell brass flare fittings. Flaring the tube is easy with the correct flaring tool which a lot of hardware stores also sell, so does Amazon. Go to youtube and you'll find lots of videos on how to do it. If anyone asks say that you're doing SAE flares. As I mentioned it is your steering and it is important, if you're not comfortable fixing it yourself find a pro.
 
Using a flaring tool isnt difficult, but you do need some room to work. I've only used the cheap flaring tools similar to shown below. The "clamp" bar has to be super tight - put an an adjustable wrench on the wing nuts and thighten them as tight as possible. Its awkward in cramped quarters so you may need to cut-back to an area where you have better access. Similarly, driving the wedge-piece to flare the copper requires a shot cheater-bar on the crossbar. This is not dainty work.

hydraulic steering systems are frequently rated at 900 psi.

Good luck

Peter

Flaring Tool.jpg
 
I will second the flare fittings for a repair. Compression fittings are for bathrooms and other low pressure systems.

I think I see a peel of the tubing so other than the bend and twist it looks to me like there is more damage than just the twist and bend.

Cut it out and splice in a proper repair using FLares.

Your steering system , many of them, when working hard in a rough sea can produce upward of 1,000PSI to get that rudder to respond especially if you have an autopilot operating.

And do some practice so you can reliably produce a double flare joint. On my boat I found split single flares and spent a lot of time cutting them off and redoing with double flares.

You will need a double flare tool kit which is what MVWEEBLES shows.
 
Last edited:
Just repeating..... Pressure rating is typically about 1000 psi, so be sure you use parts and tubing accordingly rated. Tubing comes in different wall thicknesses and you will need the strongest. Look for pressure ratings on every part you use.


Flare nuts are another part where there are different ratings. You need cast nuts, not machined nuts. Again, look for pressure ratings. Water pressure, which is what copper tubing is typically used for, is max 100 psi. Even high pressure LPG is only 250 psi or so.


And great advice to do double flares, plus practice a bunch outside the boat, then do the final flares in confined space.
 
I agree with everyone that you need to flare your fittings but you should really take it one step further.

Buy the most expensive flaring tool you can fine, probably a "Ridgid". Get a good "double flare" kit. Watch a couple youtube videos on double flaring. It is easy and with a good flaring tool really insures a good fit.

pete
 
Pete M - the better flaring tools are pretty expensive ($350-ish) and probably won't get used again by the OP. Plus the double-flares are a bit trickier than single flares (NOTE - the simple tool I linked above is a single flare, not a double flare).

The benefit of the mac-daddy hydraulic tools is they are more compact to use in tight spaces. The mechanisms that clamp the standing tube tight are much more secure.

I agree with others that even if this is not leaking right now, it should be repaired soon. It looks really constricted which will affect steering. Repair really depends on access to the line. With the simple mechanical tool I posted above, you really need to put your entire weight into it and use cheater-bars/pipe. For propane fittings, I put a dab of pipe-dope on the face to help, but I don't think it would play nicely with hydraulic oil.

If the OP has a mechanic that is familiar with hydraulics and has the nice hydraulic too (also used for brake lines, so good chance), he may want to wait and have it professionally done. If it leaks, he has recourse. I'd say there's a non-zero chance the hand-tool approach would leak.

Peter
 
The things you learn, I had never heard of a double flare before probably because I have never needed to work on brake lines.

mvweebies: I cant find anything for "mac-daddy".

I did find an Eastwood hydraulic kit:

https://www.eastwood.com/eastwood-hydraulic-flaring-tool.html?gclid=CjwKCAiAp7GcBhA0EiwA9U0mtp_zmrNuAJ1LWk0oerUmznaJbUX18uV3cZYq3u8P608BL_DdUbhM8hoCAOQQAvD_BwE&wcid=18669317715&wickedid=633861730253&wickedsource=google&wv=4

Is it as compact as the mac-daddy?

Are the compression fittings the same for single/double flare?

I am sure that I will be doing this repair myself. The cost of the hydraulic tool is much less than the cost of having a mechanic do the repair.

Thanks to all for helping out with my continuing education program.:Thanx:

Bruce









mvweebles said:
mac-daddy hydraulic tools
Click to expand...
 
PennBruce said:
The things you learn, I had never heard of a double flare before probably because I have never needed to work on brake lines.

mvweebies: I cant find anything for "mac-daddy".

I did find an Eastwood hydraulic kit:

https://www.eastwood.com/eastwood-hydraulic-flaring-tool.html?gclid=CjwKCAiAp7GcBhA0EiwA9U0mtp_zmrNuAJ1LWk0oerUmznaJbUX18uV3cZYq3u8P608BL_DdUbhM8hoCAOQQAvD_BwE&wcid=18669317715&wickedid=633861730253&wickedsource=google&wv=4

Is it as compact as the mac-daddy?

Are the compression fittings the same for single/double flare?

I am sure that I will be doing this repair myself. The cost of the hydraulic tool is much less than the cost of having a mechanic do the repair.

Thanks to all for helping out with my continuing education program.:Thanx:

Bruce
Click to expand...

Eastwood is good, and qualifies as "Mac Daddy" in my book.

Reason I say it's more compact isn't because the tool itself is smaller, but it requires much less space when using. The $30 hand tool I posted works fine if you can put the multi-hole base clamp in a vise (best); or wedged on the floor (works but distance second). For larger size tubing, you really have to womp on the wing nuts to keep the tubing from slipping when you drive the cone-wedge flare head in.

The hydraulic one has double the gripping surface as the el-cheapo; and the hydraulic ram removes the need to swing a large wrench with cheater bar held in place. It's much easier to use for in-situ repairs.

Good luck -

Peter
 
PennBruce said:
The things you learn, I had never heard of a double flare before probably because I have never needed to work on brake lines.

mvweebies: I cant find anything for "mac-daddy".

I did find an Eastwood hydraulic kit:

https://www.eastwood.com/eastwood-hydraulic-flaring-tool.html?gclid=CjwKCAiAp7GcBhA0EiwA9U0mtp_zmrNuAJ1LWk0oerUmznaJbUX18uV3cZYq3u8P608BL_DdUbhM8hoCAOQQAvD_BwE&wcid=18669317715&wickedid=633861730253&wickedsource=google&wv=4

Is it as compact as the mac-daddy?

Are the compression fittings the same for single/double flare?

I am sure that I will be doing this repair myself. The cost of the hydraulic tool is much less than the cost of having a mechanic do the repair.

Thanks to all for helping out with my continuing education program.:Thanx:

Bruce
Click to expand...


That is a reasonably good kit. There are less expensive kits as well. The key is adequately securing the tube. Not a fan of the thumb screw kits but they do work.

Since you will be splicing in a section of tube. Look for areas that give you room to work. You might find a tubing bender will allow you to splice in a larger section and make it easier to make the flares.
 
tiltrider1


You are right. Finding room to work is the challenge!

Bruce



tiltrider1 said:
Since you will be splicing in a section of tube. Look for areas that give you room to work.
Click to expand...
 
tiltrider1 said:
Since you will be splicing in a section of tube. Look for areas that give you room to work. You might find a tubing bender will allow you to splice in a larger section and make it easier to make the flares.
Click to expand...


Very good point. You don't have to do the splice right where it's damaged. You can do it anywhere along the pipe run as long as it encompasses the damaged area, and you can fish the new pipe through. That might allow you to find more convenients location to work.
 
Follow the copper line to see if there is a place to work on both ends and put in a longer splice?
 
Greetings,
Mr. PB. I second and third the advice given so far. Single flare is fine and it doesn't take a lot of bench practice time to make a good flare BUT, I'm surprised no-one has mentioned the MOST important, by far, aspect of the whole exercise:


Put the nut on the tubing BEFORE you flare it!!!!!


Um...er...Don't ask me how I know...











 
Barking Sands said:
I have this one https://www.aircraftspruce.com/catalog/topages/flaringtools2.php

Its the best one I have used and has all the dies in the tool that just rotate. Very compact. It also flares to 37 degree flares which are better than the old SAE 45 degree flares. Just be sure to buy 37 degree fittings. They are either JIC or AN.
Click to expand...



I don’t find a double flare any more difficult to preform than a single flare, it’s just one more operation, and I don’t know of an application where a single flare would be preferable over a double flare with ductile material. For copper tubing the forces required are not very high so as long as the flaring tool has nicely formed dies it should suffice. The only advice I would give would to ensure that the tube to be flared is cut square, burr free and set at he correct distance from the face of the dies. A simple vivid mark will ensure the tube remained in the correct position during the operation. Knock your self out. Oh - and if you are the curious type, put a pressure gauge on the end of a piece of sample tube you have flared and pump it up to 2000 psi or so with your grease gun. No worries.
 
RT Firefly said:
Greetings,
Mr. PB. I second and third the advice given so far. Single flare is fine and it doesn't take a lot of bench practice time to make a good flare BUT, I'm surprised no-one has mentioned the MOST important, by far, aspect of the whole exercise:

Put the nut on the tubing BEFORE you flare it!!!!!
Um...er...Don't ask me how I know...


+1 Amen.

Rob
Click to expand...
 
sean9c said:
You really don't need double flares or 37 degree JIC flares. Just keep it simple
Click to expand...

45 single flare will hold up to nearly anything with typical boat pressures. The only reason I mention 37 degree is because its become so popular and available now that in some circles they are more abundant than 45. But when both are available choices I will always opt for the 37 degree. 37 degree is actually easier to flare and less prone to cracking and has more surface area and better sealing than 45. Having said that i have some items on the boat that I redid that are 45 and some are 37. Not afraid to use either.

What I do not like...with a passion..is compression fittings with the sleeve (olive).:banghead:
 
I think that you're going to struggle, at least I have, to find JIC (37 degree) fittings in brass. They are available but not that common.

Barking Sands said:
45 single flare will hold up to nearly anything with typical boat pressures. The only reason I mention 37 degree is because its become so popular and available now that in some circles they are more abundant than 45. But when both are available choices I will always opt for the 37 degree. 37 degree is actually easier to flare and less prone to cracking and has more surface area and better sealing than 45. Having said that i have some items on the boat that I redid that are 45 and some are 37. Not afraid to use either.

What I do not like...with a passion..is compression fittings with the sleeve (olive).:banghead:
Click to expand...
 
Be real careful mixing SAE 45 with JIC 37. In a few sizes, the threads are the same, but the flare angle is different and they are NOT inherently compatible. Some manufacturers make fittings that can work with either angle, and there is a magic coded stamping on them to indicate this, but I don't remember exactly what it is. People say we try to forget past trauma, which is probably why I don't remember. It's also nearly impossible to look at a fitting and tell if it's 45 or 37 deg. Maybe if you deal with them every day, but for the rest of us, forget it. You need a gauge.



Do a favor for the next person who works on your boat. If the steering uses SAE 45 flares, which is probably does, stick with SAE 45. Mixing them together will be a nightmare for the next guy.
 
twistedtree said:
Be real careful mixing SAE 45 with JIC 37. In a few sizes, the threads are the same, but the flare angle is different and they are NOT inherently compatible. Some manufacturers make fittings that can work with either angle, and there is a magic coded stamping on them to indicate this, but I don't remember exactly what it is. People say we try to forget past trauma, which is probably why I don't remember. It's also nearly impossible to look at a fitting and tell if it's 45 or 37 deg. Maybe if you deal with them every day, but for the rest of us, forget it. You need a gauge.



Do a favor for the next person who works on your boat. If the steering uses SAE 45 flares, which is probably does, stick with SAE 45. Mixing them together will be a nightmare for the next guy.
Click to expand...


This is true. However, if you are doing maintenance and repair on fuel or hydraulic lines its prudent to do a bit of research and careful looking before just slapping any old fitting into your system. It can not be assumed that every hydraulic or fuel fitting on a boat will be SAE45. Especially on newer modern boats or boats that have been refit.

A good example is the dual Racor filters. If you install one its almost certainly going to come with 37 degree steel male fittings. You can get a few models with female (I think NPT) and of course could put in 45 degree. But the vast majority that have the 4 way valve come with the 37 degree male steel fitting. See port size at bottom of page in this link. Or check Parkers web site.
https://www.westmarine.com/racor-ma...8e0WcmUnMAoboKUBzMEDVNTh8PChwPTYaAi29EALw_wcB

37 degree sleeve type flare (the best kind over single piece) can be found at McMaster Carr for very reasonable prices https://www.mcmaster.com/37-degree-flares/

If you are going to be making a flare on something that could be removed and installed on a regular basis, or may have to be replaced due to failure, I HIGHLY recommend using a 37 degree flare with a sleeve.

Twisted Tree- I understand your sentiments regarding the next guy. It is a very valid point to take into consideration. Heck...it doesnt even have to be the next guy :facepalm: Sometimes it THIS guy..lol.
But I personally dont like to limit my choices based on that principle alone. I also think its better to discuss all options and make informed decisions.

I will be doing my autopilot upgrade soon. The old autopilot is dead long ago but the pump is still plumbed in. There are 2 places that the hydraulics have a very subtle weep I have since cranked down on those 45 degree fittings to essentially stop the weep. But when the new system goes in it will definitely have the 37 degree sleeved fittings in every area I touch. As far as the next guy. You can label fittings just as easily as you do electrical wiring.
 
Last edited:
Here's a trick to determine if a fitting is 37 or 45 without a gauge. Start with a known male 45 and hold it flare to flare against the unknown. Two 45s make a 90. Easy to eyeball the difference if one or both are 37.

Of course this won't work with female flares but if I'm the one who disassembled the joint I have the male flare in question in my hand.
 

Attachments

  • Flare angles.jpg
    Flare angles.jpg
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One other thing. I cant see all the damage in the original picture. If its just twisted slightly I would probably continue with using it. If its nicked or abraded into the material the general rule of thumb for serviceability is 10% of the original wall thickness in regards to damage depth. Of course you would need to know the wall thickness. But you might be able to guesstimate for something like this.
 
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