The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Expansion Tank
PostPosted:Thu May 19, 2022 7:37 pm 
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Joined:Wed Dec 17, 2014 10:08 am
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Location:southampton
I was looking at my sprint parts manual ,Haynes Manual and workshop manual and noticed that the expansion bottle is different to the one fitted to my car as per the pictures, my outlet comes out of the bottom,and i also see that the expansion pipe in on the thermostat housing as per the parts book is also different being raised up where as mine is level, which one is right or are they both right. Also should the expansion pipe go under the top hose and connect on to the expansion bottle (as per my picture,) or go over the top of the top hose. hopfully i have done the pictures right and you can see them.
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 Post subject: Re: Expansion Tank
PostPosted:Thu May 19, 2022 7:57 pm 
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Joined:Tue Oct 03, 2006 4:48 pm
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Location:Winscombe, North Somerset, England
The one in the parts manual is fitted to the early cars and is a nice brass affair. Later models had the plastic one like yours.

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 Post subject: Re: Expansion Tank
PostPosted:Thu May 19, 2022 10:26 pm 
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You also have the later (correct) thermostat housing fitted; there were actually three designs.

I always plumb the expansion pipe under the top hose to reduce likelihood of it chafing on the rib on the underside of bonnet. The servo vacuum pipe can also suffer from this


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 Post subject: Re: Expansion Tank
PostPosted:Fri May 20, 2022 4:14 pm 
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Joined:Mon Dec 03, 2012 6:04 pm
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Quote:
The one in the parts manual is fitted to the early cars and is a nice brass affair. Later models had the plastic one like yours.
I have both and I prefer the plastic one because you can see the coolant level and any gas bubbles at a glance.


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