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The change in pressure could go either way for different reasons.
The alpines ran 7 and 9lbs. Once you get to higher pressure the heater
cores budlge as they were not built for higher psi.
So maybe the Tigers had low psi to start and they raised psi to help with
overheating by raising boiling point....
Or they started with higher and lowered to stop heater core issues. ..????
On Thu., 29 Jul. 2021, 08:18 jimdamelio via Tigers, <tigers@autox.team.net>
wrote:
> Attached are pictures of the 9lb cap 5220487, 13lb cap 1224818 and a 13lb
> chrome Motorcraft cap. The 9lb cap measures 1" from inside base to tip o=
f
> plunger while both 13lb caps measure 1-1/8".
>
> Jim D
>
> Sent from my Galaxy
>
>
> -------- Original message --------
> From: Joe Brown via Tigers <tigers@autox.team.net>
> Date: 7/28/21 6:49 PM (GMT-05:00)
> To: Ron Fraser <rfraser@bluefrog.com>
> Cc: Tigers Den <Tigers@autox.team.net>
> Subject: Re: [Tigers] Radiator Cap
>
> Just to add to my confusion I took a look at the Tiger Parts List
> Supplement (pub number 6601131) and I'm guessing this only covers the
> Tigers up to B382001521 because it only shows the 1224725 header tank an=
d
> Ron has Parts List 6601334 which show two more tanks. Parts List
> 6601131 says the 9 lb. cap is for "later" cars and the 13 lb. cap is for
> "earlier" cars. This seems to contradict what is in TBON. Is it possibl=
e
> that some of the earliest cars had 13 lb. caps and then they went to 9 lb=
.
> caps until they changes the header tanks?
>
> The Rootes part number for the 9 lb. cap is 5220487 and when I Google tha=
t
> number I can see that is also a Mopar part number from back in the day.
> All of the usual sources want to cross this over to a 13 lb. cap. I did
> find a 9 lb. cap made by Motorad but I can't find what the stem length is=
.
> I guess I will have to go down to the different part stores and look at
> what they have.
>
> Sunbeam Specialties has three different caps for sale but they are for
> Alpines, not Tigers. I asked Rick if any of them would work for the Tige=
r
> and he said the pressure rating was too low.
>
> Ron, the G630 cap pulls up as a match for some older Land Rovers but I'm
> only finding used ones.
>
> If anybody has recently purchased a new cap that is working fine please
> let me know what you got.
>
> Thanks,
> Joe Brown
>
> On Tue, Jul 27, 2021 at 8:40 PM Joe Brown <jbbrown1980@gmail.com> wrote:
>
>> I pulled out my copy of TBON and he also listed a 9 lb. cap up to
>> B382001521 and 13 lb. after that
>>
>> I sent an email to Rick at SS to see if his part number RC5 is the cap
>> you described. It doesn't say it's for the Tiger, it just says it's for =
the
>> series V.
>>
>> On Tue, Jul 27, 2021, 8:27 PM Ron Fraser <rfraser@bluefrog.com> wrote:
>>
>>> Parts List 6601334 lists 3 header tanks.
>>>
>>> 1224725 Header Tank up to B382001521
>>>
>>> 5221224 Header Tank from B382001522 to B382001894
>>>
>>> 1236126 Header Tank from B382001895
>>>
>>>
>>>
>>> Graham Vickery sent me a drawing for Header Tank 1224725 and it
>>> indicates Filler Cap 9 lbs.
>>>
>>>
>>>
>>> I don=E2=80=99t know if the drawings for the other 2 header tanks are a=
vailable
>>> to see which Filler Cap they indicate.
>>>
>>>
>>>
>>> Ron Fraser
>>>
>>>
>>>
>>> *From:* Joe Brown <jbbrown1980@gmail.com>
>>> *Sent:* Tuesday, July 27, 2021 7:49 PM
>>> *To:* Ron Fraser <rfraser@bluefrog.com>
>>> *Cc:* Tigers Den <Tigers@autox.team.net>
>>> *Subject:* Re: [Tigers] Radiator Cap
>>>
>>>
>>>
>>> Thanks Ron, the .805" dimension sounds like what I need.
>>>
>>>
>>>
>>> On Tue, Jul 27, 2021, 6:37 PM Ron Fraser <rfraser@bluefrog.com> wrote:
>>>
>>> Joe
>>>
>>> I believe I bought my radiator cap from Sunbeam
>>> Specialties.
>>>
>>> Cap indicates 9 lbs. and G630.
>>>
>>> Rubber seal to rubber seal is .805=E2=80=9D.
>>>
>>> I installed a catch bottle for the header tank overflow. Catches any
>>> overflow which gets sucked back in when the engine cools.
>>>
>>>
>>>
>>> The Parts lists indicates 9 lbs. later cars and 13 lbs. early cars.
>>>
>>>
>>>
>>> Tiger, An Exceptional Motorcar indicates B382001521 as last unit with
>>> early header tank and 9 lb. cap =E2=80=93 B382001522 1st Tiger with upd=
ated
>>> header tank and 13 lb. cap.
>>>
>>>
>>>
>>> Well, no really good help there.
>>>
>>>
>>>
>>> I=E2=80=99m thinking 9 lbs. for early cars and 13 lbs. for later cars i=
s correct
>>>
>>>
>>>
>>> Ron Fraser
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> *From:* Tigers <tigers-bounces@autox.team.net> *On Behalf Of *Joe Brown
>>> *Sent:* Tuesday, July 27, 2021 6:07 PM
>>> *To:* Tigers Den <Tigers@autox.team.net>
>>> *Subject:* [Tigers] Radiator Cap
>>>
>>>
>>>
>>> Hi,
>>>
>>>
>>>
>>> I'm hoping one of you guys can tell me what radiator cap I should be
>>> using. I've tried a cap that was listed as being for a Tiger on Autozo=
ne's
>>> website but I think the pressure spring part under the cap is too short=
. I
>>> almost immediately start getting water out of the overflow tube as the
>>> engine warms up. I measured the depth of the expansion tank opening fr=
om
>>> the top edge to the flange where the spring part of the cap would sit a=
nd
>>> got .777". I measured the cap from the big rubber seal just under the =
cap
>>> to the small rubber seal at the end of the spring and got something lik=
e
>>> .75". So it looks like I need a cap with a longer spring stem.
>>>
>>>
>>>
>>> A brand name and part number would be great And also, what should the
>>> pressure rating be? What I have is 13 lbs.
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Joe Brown
>>>
>>> _______________________________________________
>
> tigers@autox.team.net
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/tigers
> http://autox.team.net/archive
>
> Unsubscribe:
> http://autox.team.net/mailman/options/tigers/michael.s.king@gmail.com
>
>
>
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<div dir=3D"auto">The change in pressure could go either way for different =
reasons.<div dir=3D"auto"><br></div><div dir=3D"auto">The alpines ran 7 and=
9lbs. Once you get to higher pressure the heater cores budlge as they were=
not built for higher psi.</div><div dir=3D"auto"><br></div><div dir=3D"aut=
o">So maybe the Tigers had low psi to start and they raised psi to help wit=
h overheating by raising boiling point....</div><div dir=3D"auto"><br></div=
><div dir=3D"auto">Or they started with higher and lowered to stop heater c=
ore issues. ..????</div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Thu., 29 Jul. 2021, 08:18 jimdamelio via Tigers,=
<<a href=3D"mailto:tigers@autox.team.net";>tigers@autox.team.net</a>>=
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto"><div dir=
=3D"auto">Attached are pictures of the 9lb cap 5220487, 13lb cap 1224818 an=
d a 13lb chrome Motorcraft cap.=C2=A0 The 9lb cap measures 1" from ins=
ide base to tip of plunger while both 13lb caps measure 1-1/8".=C2=A0<=
/div><div dir=3D"auto"><br></div><div dir=3D"auto">Jim D</div><div dir=3D"a=
uto"><br></div><div id=3D"m_-8542705513647194168composer_signature" dir=3D"=
auto"><div style=3D"font-size:85%;color:#575757" dir=3D"auto">Sent from my =
Galaxy</div></div><div dir=3D"auto"><br></div><div><br></div><div align=3D"=
left" dir=3D"auto" style=3D"font-size:100%;color:#000000"><div>-------- Ori=
ginal message --------</div><div>From: Joe Brown via Tigers <<a href=3D"=
mailto:tigers@autox.team.net"; target=3D"_blank" rel=3D"noreferrer">tigers@a=
utox.team.net</a>> </div><div>Date: 7/28/21 6:49 PM (GMT-05:00) </div>=
<div>To: Ron Fraser <<a href=3D"mailto:rfraser@bluefrog.com"; target=3D"_=
blank" rel=3D"noreferrer">rfraser@bluefrog.com</a>> </div><div>Cc: Tiger=
s Den <<a href=3D"mailto:Tigers@autox.team.net"; target=3D"_blank" rel=3D=
"noreferrer">Tigers@autox.team.net</a>> </div><div>Subject: Re: [Tigers]=
Radiator Cap </div><div><br></div></div><div dir=3D"ltr">Just to add to my=
confusion I took a look at the Tiger Parts List Supplement (pub number 660=
1131) and I'm guessing this only covers the Tigers up to=C2=A0
B382001521 because it only shows the 1224725 header tank and Ron has=C2=A0
Parts List 6601334 which show two more tanks.=C2=A0=C2=A0=C2=A0=C2=A0Parts =
List=C2=A0
6601131=C2=A0 says the 9 lb. cap is for "later" cars and the 13 l=
b. cap is for "earlier" cars.=C2=A0 This seems to contradict what=
is in TBON.=C2=A0 Is it possible that some of the earliest cars had 13 lb.=
caps and then they went to 9 lb. caps until they changes the header tanks?=
<div><br></div><div>The Rootes part number for the 9 lb. cap is 5220487 and=
when I Google that number I can see that is also a Mopar part number from =
back in the day.=C2=A0 All of the usual sources want to cross this over to =
a 13 lb. cap.=C2=A0 I did find a 9 lb. cap made by Motorad but I can't =
find what the stem length is.=C2=A0 I guess I will have to go down to the d=
ifferent part stores and look at what they have.=C2=A0=C2=A0</div><div><br>=
</div><div>Sunbeam Specialties has three different caps for sale but they a=
re for Alpines, not Tigers.=C2=A0 I asked Rick if any of them would work fo=
r the Tiger and he said the pressure rating was too low.=C2=A0=C2=A0</div><=
div><br></div><div>Ron, the G630 cap pulls up as a match for some older Lan=
d Rovers but I'm only finding used ones.</div><div><br></div><div>If an=
ybody has recently purchased a new cap that is working fine please let me k=
now what you got.</div><div><br></div><div>Thanks,</div><div>Joe Brown</div=
></div><br><div class=3D"gmail_quote"><div class=3D"gmail_attr" dir=3D"ltr"=
>On Tue, Jul 27, 2021 at 8:40 PM Joe Brown <<a href=3D"mailto:jbbrown198=
0@gmail.com" target=3D"_blank" rel=3D"noreferrer">jbbrown1980@gmail.com</a>=
> wrote:<br></div><blockquote style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex" class=3D"gmail_quote"><div=
dir=3D"auto">I pulled out my copy of TBON and he also listed a 9 lb. cap u=
p to B382001521 and 13 lb. after that=C2=A0<div dir=3D"auto"><br></div><div=
dir=3D"auto">I sent an email to Rick at SS to see if his part number RC5 i=
s the cap you described. It doesn't say it's for the Tiger, it just=
says it's for the series V.</div></div><br><div class=3D"gmail_quote">=
<div class=3D"gmail_attr" dir=3D"ltr">On Tue, Jul 27, 2021, 8:27 PM Ron Fra=
ser <<a href=3D"mailto:rfraser@bluefrog.com"; target=3D"_blank" rel=3D"no=
referrer">rfraser@bluefrog.com</a>> wrote:<br></div><blockquote style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex" class=3D"gmail_quote"><div lang=3D"EN-US"><div><p class=3D"MsoNorma=
l">Parts List 6601334 lists 3 header tanks.<u></u><u></u></p><p class=3D"Ms=
oNormal">1224725=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Header Tank=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 up to B382001521<u></u><u></u></p><p class=3D"MsoNormal">5221224=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 Header Tank=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 from B38200152=
2 to B382001894<u></u><u></u></p><p class=3D"MsoNormal">1236126=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 Header Tank =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 from B382001895<u></u><u></u=
></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">=
Graham Vickery sent me a drawing for Header Tank 1224725 and it indicates F=
iller Cap 9 lbs.<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></=
u></p><p class=3D"MsoNormal">I don=E2=80=99t know if the drawings for the o=
ther 2 header tanks are available to see which Filler Cap they indicate.<u>=
</u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"M=
soNormal">Ron Fraser<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<=
u></u></p><p class=3D"MsoNormal"><b>From:</b> Joe Brown <<a rel=3D"noref=
errer noreferrer" href=3D"mailto:jbbrown1980@gmail.com"; target=3D"_blank">j=
bbrown1980@gmail.com</a>> <br><b>Sent:</b> Tuesday, July 27, 2021 7:49 P=
M<br><b>To:</b> Ron Fraser <<a rel=3D"noreferrer noreferrer" href=3D"mai=
lto:rfraser@bluefrog.com" target=3D"_blank">rfraser@bluefrog.com</a>><br=
><b>Cc:</b> Tigers Den <<a rel=3D"noreferrer noreferrer" href=3D"mailto:=
Tigers@autox.team.net" target=3D"_blank">Tigers@autox.team.net</a>><br><=
b>Subject:</b> Re: [Tigers] Radiator Cap<u></u><u></u></p><p class=3D"MsoNo=
rmal"><u></u>=C2=A0<u></u></p><div><p class=3D"MsoNormal">Thanks Ron, the .=
805" dimension sounds like what I need.<u></u><u></u></p></div><p clas=
s=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=3D"MsoNormal">On=
Tue, Jul 27, 2021, 6:37 PM Ron Fraser <<a rel=3D"noreferrer noreferrer"=
href=3D"mailto:rfraser@bluefrog.com"; target=3D"_blank">rfraser@bluefrog.co=
m</a>> wrote:<u></u><u></u></p></div><blockquote style=3D"border-top:non=
e;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,20=
4);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in"><div><div><p=
class=3D"MsoNormal">Joe<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 I believe I bought my radiator cap from Sunbeam Specialties.<u></u><=
u></u></p><p class=3D"MsoNormal">Cap indicates 9 lbs. and G630.<u></u><u></=
u></p><p class=3D"MsoNormal">Rubber seal to rubber seal is .805=E2=80=9D.<u=
></u><u></u></p><p class=3D"MsoNormal">I installed a catch bottle for the h=
eader tank overflow.=C2=A0=C2=A0 Catches any overflow which gets sucked bac=
k in when the engine cools.<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0<=
u></u><u></u></p><p class=3D"MsoNormal">The Parts lists indicates 9 lbs. la=
ter cars and 13 lbs. early cars.<u></u><u></u></p><p class=3D"MsoNormal">=
=C2=A0<u></u><u></u></p><p class=3D"MsoNormal">Tiger, An Exceptional Motorc=
ar indicates B382001521 as last unit with early header tank and 9 lb. cap =
=E2=80=93 B382001522 1<sup>st</sup> Tiger with updated header tank and 13 l=
b. cap.<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p><p =
class=3D"MsoNormal">Well, no really good help there.<u></u><u></u></p><p cl=
ass=3D"MsoNormal">=C2=A0<u></u><u></u></p><p class=3D"MsoNormal">I=E2=80=99=
m thinking 9 lbs. for early cars and 13 lbs. for later cars is correct<u></=
u><u></u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p><p class=3D"Mso=
Normal">Ron=C2=A0 Fraser<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0<u><=
/u><u></u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p><p class=3D"Ms=
oNormal">=C2=A0<u></u><u></u></p><p class=3D"MsoNormal"><b>From:</b> Tigers=
<<a rel=3D"noreferrer noreferrer" href=3D"mailto:tigers-bounces@autox.t=
eam.net" target=3D"_blank">tigers-bounces@autox.team.net</a>> <b>On Beha=
lf Of </b>Joe Brown<br><b>Sent:</b> Tuesday, July 27, 2021 6:07 PM<br><b>To=
:</b> Tigers Den <<a rel=3D"noreferrer noreferrer" href=3D"mailto:Tigers=
@autox.team.net" target=3D"_blank">Tigers@autox.team.net</a>><br><b>Subj=
ect:</b> [Tigers] Radiator Cap<u></u><u></u></p><p class=3D"MsoNormal">=C2=
=A0<u></u><u></u></p><div><p class=3D"MsoNormal">Hi,<u></u><u></u></p><div>=
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><div><p class=3D"MsoNo=
rmal">I'm hoping one of you guys can tell me what radiator cap I should=
be using.=C2=A0 I've tried a cap that was listed as being for a Tiger =
on Autozone's website but I think the pressure spring part under the ca=
p is too short.=C2=A0 I almost immediately start getting water out of the o=
verflow tube as the engine warms up.=C2=A0 I measured the depth of the expa=
nsion tank opening from the top edge to the flange where the spring part of=
the cap would sit and got .777".=C2=A0 I measured the cap from the bi=
g rubber seal just under the cap to the small rubber seal at the end of the=
spring and got something like .75".=C2=A0 So it looks like I need a c=
ap with a longer spring stem.=C2=A0=C2=A0<u></u><u></u></p></div><div><p cl=
ass=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><div><p class=3D"MsoNormal"=
>A brand name and part number would be great=C2=A0 And also, what should th=
e pressure rating be?=C2=A0 What I have is 13 lbs.<u></u><u></u></p></div><=
div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p></div><div><p class=3D"M=
soNormal">Thanks,<u></u><u></u></p></div><div><p class=3D"MsoNormal">Joe Br=
own<u></u><u></u></p></div></div></div></div></blockquote></div></div></div=
></blockquote></div>
</blockquote></div>
</div>_______________________________________________<br>
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</blockquote></div>
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