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<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>> If 220 is enough to cause a boil over, I’d think the capture
bottle would</span></font></p>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>> fill up but not unscrew the cap. Then when it cools down it would
suck the</span></font></p>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>> fluid back into the radiator. I think it’s the radiator cap
and plan to</span></font></p>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>> replace it.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>The cap should definitely not unscrew
itself; even when boiling over. However, the fault may be the radiator
neck rather than the cap. There are two little tabs that the cap is
supposed to catch on; the tabs may be worn down or torn up (or even deliberately
removed).<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Any radiator shop should be able to
replace the neck for you for not much money, but you'll probably have to remove
the radiator and they may have to order the neck.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>Another possibility is that you have the
wrong cap. The original TR3 radiator takes a special cap that has a
longer "reach" between the sealing surface inside the neck, and the
top of the neck. IIRC that distance is 1" on a TR3, 3/4" on the
vast majority of cars (including later TR4A). If you have installed a
short reach cap by mistake, there might not be enough force to keep it latched
in place.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>It's best to double-check that distance;
as some crazy people (including myself) have had the neck modified to accept a
modern short reach cap.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>My experience has been that the supplied
original type caps (with the long reach and 4 psi pressure limit) will not work
correctly with a recovery bottle; even if you add a seal between the cap and
the outer rim of the radiator neck. Apparently, they leak air through the
center rivet (but I couldn't make one work even after surrounding the rivet
with RTV). What worked for me was to convert to a modern cap designed to
be used with a recovery bottle.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>FWIW, I didn't want to clutter up the
engine compartment, so I hid the bottle next to the radiator under the RH
horn. I like it there, but of course I fill through the radiator neck,
not through the bottle cap as it's almost impossible to reach.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><a
href="http://s258.photobucket.com/user/TR3driver/media/TS13571L/DSCF0013-2.jpg.html">http://s258.photobucket.com/user/TR3driver/media/TS13571L/DSCF0013-2.jpg.html</a><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'>-- Randall<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p> </o:p></span></font></p>
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