Cracked Radiator Bypass Hose (1 Viewer)

[A2ShedsJackson]

Was working on the '94 earlier today and while changing the injectors I gave the radiator bypass hose a wiggle and it cracked! The hose, not the nipple. Then when working my way back to removing the rigid hose the nipple cracked off the top of the radiator tank. I have never seen a rubber hose turn rigid like a brittle plastic and actually crack. I have rebuilt the engine 150K miles ago and replaced all the hoses and radiator. I must have used some hose from a sketchy supplier. Has anyone ever come across this before?

 

[77mustard40]

May have been cheap fuel line with a similar ID instead of coolant hose. Wasn’t OEM, says made in the USA.

 

[A2ShedsJackson]

FUEL LINE HOSE same part number hose.

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HYPALON COVER Hypalon - Wikipedia should not act the way it did. Likely not using this polymer.

DuPont Mobility and Materials Hypalon® 20 Chlorosulfonated Polyethylene Rubber, General Description

Chlorosulfonated Polyethylene Rubber, General Description, Product form is white, odorless chips. Distinguishing Feature: Readily soluble in common solvents. Good low temperature flexibility. 29 % Chlorine Content. 1.4% Sulfur Content. Very

www.matweb.com

https://www.anixter.com/en_us/resources/literature/wire-wisdom/hypalon-hype-about-discontinuing.html

 

[ToothDr]

Why would someone use fuel line instead of coolant hose In that application?

 

[A2ShedsJackson]

Is this like using a soup spoon to stir tea?

 

[george_tlc]

Is this like using a soup spoon to stir tea?

No, much worse

I replaced a line (s/c) that was marked fuel line and it had turned hard/rigid like plastic, just broke into pieces like brittle plastic. Replaced with coolant rated hose. Posted a thread on it a few months back.

Found it -> S/C Throttle Body Coolant Hose

I'm getting convinced that coolant does bad stuff to fuel line hose and one really should be using coolant rated hose for coolant.

cheers,
george.

 

[A2ShedsJackson]

It's the alcohol content of the coolant. "NOTE: Not to be used with fuel over 10% alcohol."
The HYPALON has been out of production for 10 years in the USA. Must have been old stock or overseas sourced and brought back to the USA.