[Tigers] Radiator Cap

[Gary]

Joe,
If you are getting water out short of boil over, you are just filling it 
too much.  In a Tiger this is well down from the opening and is actually 
below
the top of the radiator.  What you need is a recovery tank like a modern 
car, this will keep the system full.. heat expansion pushes water into the
recovery tank and when it cools back down it will be sucked back in.
Antifreeze tastes good but poisons small animals, please make this mod.
It sounds like your new cap with two rubber seals is the correct one 
already, the original Tiger had only one seal at the bottom IIRC.
Gary


On 7/27/2021 3:07 PM, Joe Brown wrote:
> 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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