water inlet tube angle

by jay white in 912 / 914 Technical Questions 7 years ago

The water inlet tube angle on the cylinder head is the wrong angle for my application. I am moving the coolant reservoir to accommodate the oil reservoir on a Kitfox model IV. hence the need to change the tube angle. looks like its threaded and loctite as well. Cant find the reference in the heavy manual. Any ideas?

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Re: water inlet tube angle

by Roger Lee » 7 years ago

Roger Lee

125 5.12k 4.52k

HI Jay,
It is threaded. Heat it with a heat gun or butane torch to release the Loctite. Then screw it back together and put it on the plane. Use a Magic marker to mark the flange and tube for your correct position. Then take it back apart, clean the threads. I prefer Loctite 648 here, but some use 243. Coat the threads all the way around to get a good seal after it sets. Let it cure well before adding any coolant.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: water inlet tube angle

by jay white » 7 years ago

jay white

36 97 23

Thanks Roger,
I"m ordering the 648, It varies in price from hundreds of dollars to 40 dollars. I need to do four tubes, so I'll buy the 40 dollar one :)

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Re: water inlet tube angle

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.96k

Keep in mind that the tubes are available in both 45° and 80° versions if you need a different angle.
When removing them, it is easier to grab the tube firmly in a vice and while heating, turn the flange with a large wrench.
These are aluminum parts and will need more heat and force that you might anticipate.

Locktite 648 is intended for press-fit parts. These are threaded parts. I suspect that the wicking properties are the determining factor.
If you are buying a $40, 50ml bottle you will have enough for a couple of hundred fittings.
The $5, 0.5ml tube is all you will need. Locktite has a shelf life of two years.

The 290 Green, Wicking Loctite, is available at most auto parts stores.
You can assemble the tubes dry and get the positions correct before applying a couple of drops to the threads.
It will wick into the threads and seal them up.
You are not concerned with these parts coming loose.
You are just filling the threads to prevent leaks.

Be extremely careful when reassembling them.
The tubes are soft aluminum and will gall and bind in the flange with the slightest excuse.
A few drops of lacquer thinner on the threads helps to act as a temporary lubricant that will evaporate and be gone in a few minutes.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: jay white

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Re: water inlet tube angle

by Roger Lee » 7 years ago

Roger Lee

125 5.12k 4.52k

Hi Bill,

Loctite 648 green a sleeve retainer compound is an acceptable Loctite for the tubes. It's either in the manual or an SB I can't remember right now. It does need heat again to remove, but it never leaks again or comes lose.

p.s.
Jay,
It does come in small tubes.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: jay white

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Re: water inlet tube angle

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.96k

Hi Roger,

I didn't mean to imply that 648 would not work, just that 290 works as well and may be easier to find in the small sizes.
I had to take a full water system apart and found that the factory Loctite appeared to be mostly on the outer threads and not fully soaked into the inner ones.
This indicated to me that the factory may assemble the hoses first and apply the 648 as a wicking sealant once everything was in their final positions.
Having to get everything in place and marked and then disassemble it all to apply the thread sealant and then hope it all goes back into place correctly is asking for too much.

None of the plumbing job was much fun and not something I wanted to do twice.;)

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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