BIPASS HOSE

[pandaman]

Evening All
I have a 1098 Morris and have to change that dreaded bypass hose due to it leaking, I will be removing the rad,
Has any fellow Moggie owners found any good tips or ideas on how to do this tricky job, someone suggested removing the water pump. Thanks


Regards Pandaman.

[philthehill]

I would be removing the water pump.
The convoluted type can be fitted without removing the water pump but consider it a interim fix.

[les]

Remove pump or head, obviously the pump is simpler! There are flexible hoses but generally considered a bad idea.

[les]

Oops, beat me to it!

[philthehill]

http://www.minispares.com/product/Class ... sic/bypass hose.aspx|Back to search

Not this type:-

http://www.minispares.com/product/Class ... .aspx|Back to

[KeithL]

http://www.minispares.com/product/Class ... sic/bypass hose.aspx|Back to search

Not this type:-

http://www.minispares.com/product/Class ... .aspx|Back to

Why? We have the second type fitted and now I'm worried.

[philthehill]

Keith
The convoluted type has been known to fail and is described so in the Minispares link.
The convoluted type of bypass hose was always fitted by the BMC garage I worked at as they could be changed without removing the water pump especially beneficial it the car was a classic Mini and time was of the essence.
I always kept a convoluted hose in the tool box for roadside emergencies.
As your convoluted bypass hose is already fitted and I presume is showing no signs of fatigue I would leave well alone but fit the solid tube type as per the first link when the need arises.
The OP bypass hose has failed and has to be replaced so it makes sense to fit the better and more reliable bypass hose.
Phil

[KeithL]

Thanks for that Phil. I think mine is okay but I will keep a close eye on it now that I know there is a weakness there.

[simmitc]

I agree that the convoluted hoses are great for road side fix but not for permanent use. However, I have found that the Kevlar reinforced hoses also have a very short life. I therefore recommend using a silicone hose with round edged stainless steel hose clips. So far these seem to be "fit and forget".

[philthehill]

by-pass adapter.JPG (640.24 KiB) Viewed 1088 times

Here is the silicon hose.
http://www.minispares.com/product/Class ... sic/bypass hose.aspx|Back to search

So the choice is yours - silicon, rubber or Kevlar. All have their advantages.

Though a length cut from 1/2" heater hose is just as good.

I will not advise the removal of the bypass hose facility unless you provide alternative means of allowing water to circulate through the head before the thermostat opens.

A good tip about using round edge clips so as not to cut into the hose.

I would advise that you check the condition of the bypass stub fitted into the cylinder head when you remove the pump as there may be some corrosion of the stub which does not help.