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Posted By : Karl Doe, 07-Jul-2007, 01:09pm
Hi all,
While my PI Spitfire's in pieces (not enough weekends!) I've bought myself a new toy in the form of a TR7 V8.....
It seems really well put together apart from a few minor bodges from the last owner and a slight problem retaining coolant so the question is how many
connections should be on the header tank?
It is a late TR7 with the metal tank mounted on the OS inner wing. There is a hose to the top of the rad and one from the overflow/pressure cap but there's
a third hose which I think should be routed to the thermostat housing and this has been blanked off. From my experience with tuned 'A' series engines (and
looking at my rover 216!) I thought this pipe was essential to allow a small flow through the header tank and purge air bubbles, etc. I can't find any
pictures/guides online that answer my question and the Rimmer Bros catalogue diagrams suggest this hose might go back to the thermostat but it's not
conclusive. Also, my existing thermostat housing exits at the 12 o'clock position and has ho tapping for the small header tank hose so I will need to
change the housing or fabricate a 'T' piece of some sort.
Should I connect the hose?
Cheers
Karl.
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Posted By : Chris Taylor, 07-Jul-2007,
02:49pm
Not all cars with an expansion tank have any flow through them, and this should have little bearing on loss of coolant. I should imagine that sometimes
a through flow would help to avoid air locks. If you get TOO big a flow through the tank, it will in effect bypass some of the pump flow through the
tank rather than the radiator and result in marginally less cooling. As long as it is a small pipe, or there is some constriction in the fittings at
tank or thermostat end, (something like 1/4" bore would be about right) I can't see there being any harm in connecting the pipe as you suggest. Ideally
the pipe from the base of the expansion tank should go to the highest point on the block/head/water pump.
Without seeing exactly where all the other pipes go, it's hard to advise where all the pipes should go. If there IS to be any flow through the tank,
then of course each of the pipes should in effect go to opposite sides of the water pump. If the tank is just there to allow air bubbles to work their
way out of the system, then they should be connected at the highest points of head and radiator (and possibly heater?) and the water level in the tank
should be above those heights.
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Posted By : Karl Doe, 12-Jul-2007,
02:02pm
Thanks for your advice. I'll see if I can take some photos. It would appear that the standard mounting of the header tank on the offside inner wing
puts it close to or below the height of the top of the radiator and certainly below the route from the thermostat elbow to top hose of the radiator
(with the existing pipework).
Cheers
Karl.
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Posted By : Hugh Glossop, 12-Jul-2007,
07:35pm
Karl
As your new tr7/8 reg give me a ring on 01591 610433, there are several ways of dealing with expansion tanks and air bleeds on v8's depending
on what you have.
hugh
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Posted By : David Rumens,
20-Jul-2007, 03:47pm
Hugh,
I have sent you the IVR for my TR7 using the TR7@tssc.org.uk email address. If it does not get through just email me using my
Vitesse@tssc.org.uk and I will sent on reply
Good to see you on the Message Board.
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Posted By : Hugh Glossop,
21-Jul-2007, 08:30am
dave thanks for sending IVR (the first one!)
will reply in due course
hugh