[Tigers] Radiator Cap

Wed Aug 18 11:20:59 MDT 2021

I have an update on my quest to find a radiator cap.  I wound up ordering a
Scott Drake Mustang cap from CJ Pony Parts and it fits really well.  And
since my temp gauge was always pegged out really high I installed a
mechanical temp gauge from Summit on my Edelbrock intake.  After idling for
about 20 minutes the temp never got over 190.  Now I need to take it out
for a long drive and see how it does.

Thanks for all of the info from everybody.

Thanks,
Joe Brown

On Thu, Jul 29, 2021 at 9:35 AM Ron Fraser <rfraser at bluefrog.com> wrote:

> Jim
>
>                 Thank you for the pictures.
>
>
>
> It appears I have the MOPAR 5220487 Filler cap – good to know.
>
>
>
> This also indicates that any 522xxxx number in the Parts List is a
> Chrysler part number – excellent.
>
>
>
> Ron Fraser
>
>
>
> *From:* jimdamelio <jimdamelio at verizon.net>
> *Sent:* Wednesday, July 28, 2021 8:11 PM
> *To:* Joe Brown <jbbrown1980 at gmail.com>; Ron Fraser <rfraser at bluefrog.com>
> *Cc:* Tigers Den <Tigers at autox.team.net>
> *Subject:* Re: [Tigers] Radiator Cap
>
>
>
> 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 of
> plunger while both 13lb caps measure 1-1/8".
>
>
>
> Jim D
>
>
>
> Sent from my Galaxy
>
>
>
>
>
> -------- Original message --------
>
> From: Joe Brown via Tigers <tigers at autox.team.net>
>
> Date: 7/28/21 6:49 PM (GMT-05:00)
>
> To: Ron Fraser <rfraser at bluefrog.com>
>
> Cc: Tigers Den <Tigers at 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 and
> 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 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?
>
>
>
> 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.
> 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 Tiger
> 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 at 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 at 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’t know if the drawings for the other 2 header tanks are available to
> see which Filler Cap they indicate.
>
>
>
> Ron Fraser
>
>
>
> *From:* Joe Brown <jbbrown1980 at gmail.com>
> *Sent:* Tuesday, July 27, 2021 7:49 PM
> *To:* Ron Fraser <rfraser at bluefrog.com>
> *Cc:* Tigers Den <Tigers at 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 at 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”.
>
> 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 – B382001522 1st Tiger with updated
> header tank and 13 lb. cap.
>
>
>
> Well, no really good help there.
>
>
>
> I’m thinking 9 lbs. for early cars and 13 lbs. for later cars is correct
>
>
>
> Ron  Fraser
>
>
>
>
>
>
>
> *From:* Tigers <tigers-bounces at autox.team.net> *On Behalf Of *Joe Brown
> *Sent:* Tuesday, July 27, 2021 6:07 PM
> *To:* Tigers Den <Tigers at 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 Autozone'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 from
> the top edge to the flange where the spring part of the cap would sit and
> 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 like
> .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
>
>
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