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Old 05-12-2009, 10:20 PM   #1 (permalink)
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Coolant bypass tube in FE intake...

Is there something readily available to make a new one? The one in my intake was corroded and it didn't survive the sand blaster. It measures about 1 1/4 inches in diameter. DSC Motorsports sells one, but I would like to try to make own.
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Last edited by Domino; 05-12-2009 at 10:24 PM.
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Old 05-13-2009, 05:28 AM   #2 (permalink)
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Re: Coolant bypass tube in FE intake...

I could never find one for my 360/truck, but the local mustang parts shop sent me to a shop that made custom braided pressure hoses for power steering/brakes/fuel/ac etc. I took the old one with me and they fixed me up with a brass fitting with 90 just like original for about $3. They don't really need to be automotive, plumbing fittings will work, but you really need the 90 degree fitting to keep the hose flat to the intake. Those custom stainless braided hoses looked great, but pricy.

It may be hard to make one because the 90 is so tight it will be hard to fabricate.
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Old 05-13-2009, 06:48 AM   #3 (permalink)
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Re: Coolant bypass tube in FE intake...

iv never seen a bypass that was a 90degree angl-- they run streight from the water pump to the intake--

im sure if you were careful -you could tap it for a brass 5/8 fitting -- just thinking out loud here--
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Old 05-13-2009, 06:49 AM   #4 (permalink)
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Re: Coolant bypass tube in FE intake...

Quote:
Originally Posted by Domino View Post
Is there something readily available to make a new one?
Hey Domino,
Are you talking about the outlet on the intake manifold that has a hose going to either the carburetor spacer or the bottom tube on the heater core?

If it is, Greg Donahue has what is called the Heater Hose Outlet Elbow, Part Number: C1AF-18599A. He's asking $35.00 for the piece.

HTH

JC
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Old 05-13-2009, 07:21 AM   #5 (permalink)
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Re: Coolant bypass tube in FE intake...

morn JC -- he said bypass nipple-- thats the one that runs from the water pump to the intake --it by passes the thremastat-- --now im not sure what he needs -- a pic would help--

holy carp JC -35 dollars --they sure are proud of that stuff--
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Old 05-13-2009, 08:03 AM   #6 (permalink)
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Re: Coolant bypass tube in FE intake...

I am talking about the one that is pressed into the front of the intake that goes to the water pump. It is to the right of the opening for the thermostat. It is just a straight piece of thin wall tubing. I could easily make one if I could fins some tubing the proper size. It is 1 1/4.
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Old 05-13-2009, 08:05 AM   #7 (permalink)
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Re: Coolant bypass tube in FE intake...

Quote:
Originally Posted by Rich27028 View Post
morn JC -- he said bypass nipple-- thats the one that runs from the water pump to the intake --it by passes the thremastat-- --now im not sure what he needs -- a pic would help--
Hey Mr. DH,
Oh yeah... The one that has the little short hose that goes between the intake manifold and the water pump. But that isn't a 90 degree elbow!

Quote:
holy carp JC -35 dollars --they sure are proud of that stuff--
Hey, MR. Donahue needs his profit! Besides, it's a 90 degree elbow, and that come out to only $.39 a degree! Cheap at twice the price!

Have a GREAT day!

JC
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Old 05-13-2009, 08:11 AM   #8 (permalink)
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Re: Coolant bypass tube in FE intake...

Quote:
Originally Posted by Domino View Post
I am talking about the one that is pressed into the front of the intake that goes to the water pump. It is to the right of the opening for the thermostat. It is just a straight piece of thin wall tubing. I could easily make one if I could fins some tubing the proper size. It is 1 1/4.
Hey Domino,
I got your post and donwhis' post mixed up. He was the one that said it was an elbow. Sorry about that.

I just went and measured the diameter of the part you reference on an the original water pump off of Ms. American, and that tube is not 1-1/4". It's 5/8" and accepts a 5/8" heater hose.

Finding a 5/8" tube shouldn't be all that hard to do. Probably a plumbing supply would have copper tubing that size.

JC
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Old 05-13-2009, 08:22 AM   #9 (permalink)
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Re: Coolant bypass tube in FE intake...

You are correct. It is 5/8. I don't know where I came up with the other measurement. I checked plumbing supplies and the all seem to be either 1/2 or 3/4. I plan to peruse the parts house today.
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Old 05-13-2009, 08:31 AM   #10 (permalink)
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Re: Coolant bypass tube in FE intake...

You can just tap the hole with a 3/8 NPT tap. Then go to the plumbing section of a hardware store and get a short length of brass tubing that's threaded. Then cut it to the correct length and cut a slot on the end so you can screw it in.
Here's a picture of one I made:






Now I just plug the bypass since it's a hassle to deal with that hose when pulling the intake.


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Old 05-13-2009, 09:40 AM   #11 (permalink)
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Re: Coolant bypass tube in FE intake...

Does blocking that tube cause any heating/cooling issues? It is a PITA to deal with. I ALWAYS forget it.
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Old 05-13-2009, 09:41 AM   #12 (permalink)
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Re: Coolant bypass tube in FE intake...

the object of that bypass is to flow water to your intake and heads if the thermostat sticks shut-- --
do away with it and yo stand a chance of cracking a block from over heating if the thermostat sticks ----
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Old 05-13-2009, 11:32 AM   #13 (permalink)
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Re: Coolant bypass tube in FE intake...

These guys make water pumps with no bypass. They have thermostats with holes drilled in them to let some water flow until the thermostat opens. I drilled three 3/16 holes in my t-stat and it works fine with no bypass. Just takes a bit longer to warm up.

Stewart Components - High Performance Automotive Cooling
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Old 05-13-2009, 05:30 PM   #14 (permalink)
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Re: Coolant bypass tube in FE intake...

A contractor friend suggested conduit. I am going to the hardware store tomorrow to measure some. It is galvanized, so that should help.
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Old 05-13-2009, 05:35 PM   #15 (permalink)
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Re: Coolant bypass tube in FE intake...

Back when, we made the coupling out of a small chunk of water heater hose. There is an early style of larger diameter than the late 1960's style.

In order not to blow it out again, was simple trick to install three hose clamps. One at each end, and then one in the center, where it will eventially blow up, and poop out. You then get a good 6-8 years of use from the one short hose.


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