This coolant hose keeps shifting off, how do I get it to stay attached?



My latest attempt this morning was to make the hose clamp the primary securing and the spring-ring secondary (see photo), but I'm getting tired of this trivial problem causing a big leak.

 

Speaking from experience, the only solution might in fact be to replace the plastic pipe that the rubber hose is attached to, which by the way I'd suggest all of you to inspect on your cars.

The material that it's made of tends to deteriorate through the years and can cause leaks on the joints with rubber hoses, may crack or even burst as my thermostat assembly did (same typ of plastic).
In the last option your cooling system gets emptied instanly- far from a convenient situation being far from home.

The part is not so expensive and is not that labor intensive to replace, you can easily change it yourself on an afteroon having a drink, so i strongly recommend considering it

 

You think it's the plastic pipe cracked? I'd assumed it was either the spring clamp had loosened up or the hose stretched out.

 

Not essentialy cracked, but it might have just lost the original diameter thus making the joint not tight enough.

If it looks ok though, it' most likely a stretched hose.

 

Yes, the lip erodes eventually, so replace the crossover pipe.

 

Well, the hose should be pushed right up to the arrow as indicated. How old is the hose? How old is the clamp? Those spring clamps can lose tension and then be useless...

 

Beware, the problem with GM F bodies in the early 2000's late 90's was dexcool deteriorated the plastic intake manifold gaskets and plastic coolant bypass pipes, that stuff wrecked havoc on my sons 2001 Firebird and the car was a low mileage and well maintained example. Not a fan of the stuff especially after that trouble and seeing it is the brand of choice Jaguar put in my XJR-100.

 

I have experienced this problem in the past. The reason the hose slides off is the BARB that is on the end of the pipe has dissolved away. The pipe is now smooth and the hose will not stay on. Each plastic pipe on the cooling systen has a BARB at the end. Without the BARB there is nothing to prevent the hose from sliding off.
Take aa look at the water outlet pipe in the attached link. Note the BARB on the end of the pipe where the hose mounts.
It would be worthwhile to inspect the other pipe fitting to connections on your cooling system. Yes the coolant does eat away the ends of the pipe.

SNG Barratt - The Ultimate Jaguar Parts Specialist

 

+1 Replace the crossover pipe, mine was crumbling from internal corrosion (same time replace the TST) and temp sensor; then make it a habit, in the Winter, to retighten the hose clamps at least once a month. Not sure what the problem is, either material or design, but mine was always loosened, and came off completely under pressure once.

After I replaced the crossover pipe (and all hoses, water pump for the second time, TST and tower), I would still be able to tighten the clamp 90 degrees every month in the Winter. Became routine at same time I checked the oil. There was a thread, couple of years ago, where Sean (I think it was Sean) argued that only the spring clamps worked on these cars. Crazy! In 60 years of working on cars, first one to ever have this issue.

 

The water outlet pipe is less than $100 and yours is old/deteriorated!!!!!!!! Replace it !!!!!

bob

 

[QUOTE=Jhartz;1579378After I replaced the crossover pipe (and all hoses, water pump for the second time, TST and tower), I would still be able to tighten the clamp 90 degrees every month in the Winter. Became routine at same time I checked the oil. There was a thread, couple of years ago, where Sean (I think it was Sean) argued that only the spring clamps worked on these cars. Crazy! In 60 years of working on cars, first one to ever have this issue.[/QUOTE]


Maybe all the other cars had metal joints.

I'm with Sean on this one.

The problem with a hose clamp is that the plastic shrinks with heat under
the tension of the hose clamp while cooling. Then, it feel loose again.
Tighten, rinse, lather repeat until the plastic shatters.

On the other hand, the spring band can expand and shrink as needed.

Not only that, the clamping force is 360* as opposed to almost 360*.

I'm wondering if fitting the factory arrangement from a supercharged
engine wouldn't be a superior solution to the aftermarket towers.

 

Avern1 gets the first confirmed diagnosis - indeed there is no barb remaining on my pipe after 140k miles - thank you for pointing that out!!! This forum is awesome!

It is possible that the spring is also weakened, and the temperature theories about why spring is better than a hose clamp make sense, BUT I've never ever seen a firmly tightened hose clamp fail and I have seen failures with a few of the springs on my previous car.