[Fot] TR3 race motor losing water

[EDWARD BARNARD]

Group:
On that note I had a customer car that leaked from the same spot; where
the extension met the header tank. It seems whenever he checked the water and
reinstalled the cap he would push down to turn the cap and kept fracturing
that joint. I finally welded gussets between the extension and the header tank
to add some needed strength. Still holding well after 2-3 years.
-Ed-
________________________________
 From: Don TR <58tr3a at videotron.ca>
To:
'MadMarx' <tr4racing at googlemail.com>; 'Friends of Triumph'
<FOT at autox.team.net> 
Sent: Sunday, December 15, 2013 11:50 AM
Subject: Re:
[Fot] TR3 race motor losing water
  

I had a leak somewhere in the radiator
of my 1958 TR3A and took the valance
off to re-solder (and later JB Weld) all
around sloped filler extension
where it joins the header.  I did this three
consecutive years.  But it
still kept leaking.  Maybe only a cup of coolant
every two weeks.  I could
see the stain where it had dripped down the fins on
the rear of the
radiator.  My TR3A is a tourer, not a race car.

So I took it
out again and took it to a radiator shop.  He plugged the hose
inlet and
outlet, and checked it with 40 psi compressed air.  He found the
leak right
away.  It was along the folded and soldered seam that runs the
full length up
the sloped bottom of the extension.

If you say your sensor is down under
there, the fitting may be leaking.

Don Elliott, Original Owner, Montreal
-----Original Message-----
From: fot-bounces at autox.team.net
[mailto:fot-bounces at autox.team.net] On
Behalf Of MadMarx
Sent: December-15-13
10:24 AM
To: 'Friends of Triumph'
Subject: Re: [Fot] TR3 race motor loosing
water

Hi,

had the same problem over the years.
It was always the head
bending of full throttle and long straights.
Kas solved this for me:

He told
me to put a 0.236" (0.6mm) wire on top of the sleeves.

Never any problem
again.

Cheers
Chris

-----Urspr|ngliche Nachricht-----
Von:
fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] Im
Auftrag von
Geoff Byrne
Gesendet: Sonntag, 15. Dezember 2013 13:35
An: Friends of Triumph
Betreff: [Fot] TR3 race motor loosing water

AMICI

We have a TR3 race car
which keeps loosing water from the radiator and we
don't know why any thoughts
from the collective wisdom of FOT



Problem:

too much water/coolant pumped
out of radiator

only occurs on circuit with long straight.

never overheats
or runs too hot

low water warning light comes on towards end of race, (
situated bottom of
header tank extension)

leak down test 98% seal

head
pressure tested

recovery cap (6 and 12 lb) fitted to header tank, overflow to
recovery tank
(Morris 1100), drains into bottom of recovery tank, and overflow
to catch
tank(open to atmosphere)

initially, fluid ran from recovery tank to
overflow catch tank, and then
vented all over engine.

radiator serviced,
obstruction in tubes found and cleared, catch tank no
longer overflowed.

i.e.
less fluid leaving cooling system

using 5 blade improved impeller pump, no
thermostat (1" restrictor plate,
bypass occluded)

w/pump rotates at less
than, or at most, equal to engine speed

running at approx 6500rpm down
straight

at race end, after cool down, recovery tank empty (to level of
recovery
intake pipe, recovered) and overflow catch tank is full (approx
400-500ml),
unable to be recovered.

Theory: water pump putting too much water
into header tank on long run at
6500rpm, escapes via recovery cap.

But, not
explained-- the level in the header tank remains low.

Any advice welcome
Geoff Byrne

TR6 Racer down under
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