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 Posted: Feb 8, 2022 03:27PM
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Thanks - had sucess with it today.... Knowing it was possible encouraged extra cursing leading to success.  Hope that was it not the waterpump weep hole.... Agree in the perfect world pressurizing the system would have been a better approach instead of just replacing suspect parts.  Maybe I'll get lucky.  Given PO used form a gasket around hose and ancient hose clamps the gods may smile on me.  Should know tomorrow when I get things back together.

 Of course I also noted a wheel cylinder has been leaking when I jacked it up to get the drain pan under it so the list is longer.......

KimB  

 Posted: Feb 8, 2022 08:53AM
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US
A Radiator Pressure Test Kit would be the right way to Apply Pressure to the system , without the vehicle running to find the leak.

 Also check the Waterpump Weep hole - bottom of the pump for drips.   That drips into the Pulley then fan and everywhere when running.

Now if you KNOW the hose is leaking, by all means the fold in half replacement method works ( i even use normal radiator hose)
  but if the Waterpump is suspect .  go for both replace it all.

 Posted: Feb 7, 2022 08:17AM
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CA
Yes, five decades for me too. Agreed about cutting it a wee bit shorter. The hose can be bent double using pliers. If I recall the trick is to have the hose coming out the right side of the pliers so you can maneuver behind the fan, so it does not need to be removed either. I had one of the bellow type bypasses blow out about 60 miles from home and was able to do a road-side repair.

.

"Hang on a minute lads....I've got a great idea."

 Posted: Feb 7, 2022 06:52AM
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It's been decades since I've replaced that bypass hose. I think I remember it was rather difficult to bend and put hose in place. If I remember correctly. I trimmed the hose a little shorter than full length, enough for the clamps to work and used vasoline. Hope that helps. Breaking the gasket seal is a recipe for a leak. 

 Posted: Feb 6, 2022 02:43PM
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CA
You don't need to loosen the water pump.
Cut a piece of hose to fit between the head and water pump.
Put a new hose clamp very loosely over the nipple coming up from the water pump.
Have the upper clamp ready to fit in.
Take the piece of hose and fold it in two, using a pair of pliers or vise-grips.
Place the upper clamp loosely over the end of the hose.
Insert the hose ends to the edges of the nipples and push the hose in, easing the pliers as you go..
If the length is right, the hose will slip right in.
Position the clamps and tighten them up.

.

"Hang on a minute lads....I've got a great idea."

 Posted: Feb 6, 2022 12:44PM
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Mk1 850.  I have a small mystery coolant leak on the back side of the engine. Only when running and it is a pinhole that sprays (mists), hits the fan belt and is all over before I can identify the source.   Tightening hose clamps didn't solve.  Shouldn't be the radiator as fan would blow it the other way.  In any case I am in the process of replacing the suspect hoses and clamps in hopes of resolving. I suspect I know the answer (but I didn't like my answer) - looks like I have to at least loosen the water pump to get the replacement bypass hose in place? Any one have have a better hack? Note it is 80 in garage so replacement hose is not frozen ;-).  Any other likely suspects I should be aware of in the area. 

Thanks 

Kim