water inlet tube angle

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

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Re: water inlet tube angle

by jay white » 7 years ago

jay white

36 97 23

I did find some good 5/8 hose with bends and angle that may actually work! While i'm fitting the hoses to the elbows I would like to be able to manipulate them a little on the metal. Can I or should I use any type of lubricant i.e. silicone grease, to ease that process or does that lend itself to slippage later?

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Re: water inlet tube angle

by Kevin Machniak » 7 years ago

Kevin Machniak

6 167 40

Hi,
From your pictures it appears like you are doing the switches on the bench without it installed on the motor mount.

I personally would have the engine on its engine mount before I would relocate hoses, expansion tank, etc....

I ended up putting my new 912 uls on the engine mount to overcome some conflicts after trying without the mount.

I was swapping a new identical engine from the old one.

Thank you said by: RotaxOwner Admin, jay white

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Re: water inlet tube angle

by Roger Lee » 7 years ago

Roger Lee

125 5.12k 4.53k

Hi Jay,
Use the 17mm. 5/8" is too small and where it gets stretched over the metal tube it can stretch past its design limit and cause the inner thread wrap to break and the over stretched area can easily crack and break earlier than it should. You would also need to change the spring clamps. Remember there is expansion and shrinking going on during cold and hot cycles. This can cause more stress and leaks.
11/16" is just too big and usually leaks.

Think of it this way. You may save $75 trying to use 5/8". While flying one day you have a coolant failure either over hostile terrain and or no place to really land. Maybe you do set it down a long way from home. Right at that moment would you give $75 to not have to be going through all that grief, work and most likely a huge expense over that original $75?

Personally I would give up a lot more than $75 so why not just do it right up front? We are way up off the ground while flying with lots of time and money invested. I see no good reason to chip away at keeping good odds in my favor.

Been there, done that when I was young. I got older and a tad wiser.

p.s.
Don't FORCE me to come to Idaho to work. I'm supposed to come up on vacation and relax. :lol:

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

Thank you said by: RotaxOwner Admin

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Re: water inlet tube angle

by jay white » 7 years ago

jay white

36 97 23

Yes, the engine in on the bench. I called CPS, Rotech etc, and there are not any 17MM hoses with 90 degree bends in them. The small amount that the 5/8 stretches to go over the nipple does not appear to be excessive but your right, heat and cooling are from 0 degrees to 180+. Definitely a lot of range for an ill fitted hose.
The coolant tank IS moving. No choice. The oil tank is NOT moving. no choice. I will pull the old coolant reservoir off my old engine. (they are different.) on the new one and see if the straight run hoses will work with that. I hope so, but too bad I have to use 20 year old parts on this pretty little (and expensive) motor. I"ll send some pix.

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Re: water inlet tube angle

by Roger Lee » 7 years ago

Roger Lee

125 5.12k 4.53k

Hi Jay,
Yes there is a 90 degree 17mm hose. I order it all the time and Rotax uses it on the top #3 cylinder. It should have come on your engine. You can us a straight 17mm and put an 11/16" spring in it. Then it could be bent to 180 if need be. Stay away from the 5/8".

Look in the parts manual for the 90 degree part number on the top #3 cylinder.

p.s.
Flight Design aircraft move the coolant expansion tank in front of the carb balance tube, rotate it and put the 90 degree on the #2 cylinder.

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

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