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Not sure about the expansion tank question, but if you turn around your windscreen washer bottle it will slide in lot easier and fit nice and snug. The recess down the lower half of the sides and across the bottom are to accommodate the mounting bolts for the bracket to the inner gaurd.
in the Series 3, there is an expansion tank for the expansion tank, called a Bladder. It is hidden under the left wing-fender. The additional nipples of the main expansion tank are for connections to this Bladder.
in the Series 3, there is an expansion tank for the expansion tank, called a Bladder. It is hidden under the left wing-fender. The additional nipples of the main expansion tank are for connections to this Bladder.
Well I didnt miss what I didnt know I didnt have. The only reservoir my lump has is the one under the the left wing-fender-mudgaurd. Did not know there was originally another tank in the system.
Most commonly the tank on the side wall of the engine bay is called a "header tank". The header tank takes the place of the radiator tank on those cars where you actually add water/coolant directly into the radiator.
The one tucked up inside the fender, by the front wheel, is an 'atmospheric tank' / expansion tank/ recovery tank/overflow tank. It might be....I dunno....that Series II and earlier cars had an open cooling system and did not use such a device. Coolant expelled from the header tank merely went onto the ground.
thanks guy. it appears the S3 Header Tank's main plug on the base goes into the radiator and the neck one of the cap goes to the atmospheric tank under the left fender, the two smaller ones at the end of the tank are still a bit unclear as to destinations.
I think one of them goes to a nipple on the filler neck at the front of the engine. The other, perhaps. goes to a steam pipe above the radiator?
Someone with an early Series III will come along and post a pic. (After 1982 or so there is a different tank arrangement and plumbing on the Series IIIs)
The original Coolant Tank in my 77 XJ6C is riddled with pin holes. Looking at it, any Aluminum or even Plastic Pressure capped tank that would fit, would work. With all the experience in this site, isn't there a set recommendation for a great replacement ?
The Series 2 has a Pressurized Expansion Tank with one inlet from the pressurized side of the cooling system on the bottom and the outlet is above the pressure seal on the 15 PSI Cap with a line that is routed out through the wing wall to ground. It makes no difference how many inlets or outlets any tank has as long as it is designed to be pressurized and fits the space. There are a number of Aluminum tanks I would think might work and as Jose says, just plug any surplus fittings.
Last edited by Excalibur2012; Mar 8, 2021 at 07:34 AM.
plugin cap kits are sold at auto parts stores. they come in many sizes. Also tiny clamps and universal expansion tanks.
my '65 S type was updated in the 1970's with a plastic Volvo 1800-E expansion tank, a long bottle with a radiator cap and a hose from the radiator neck port to the bottom of the bottle. These cars never had an expansion tank to begin with, so they spilled coolant on the ground when it got hot and expanded. The Volvo tank fits neatly in the limited space of the engine bay.
I think where we are is that the idea of buying a used tank or repairing a unit made of less than ideal material is not the cure. Would be nice if someone could justify making & selling a new Aluminum replacement for a "reasonable" price & low production volume.
Just ordered one of these ! Should be able to install it in my Series 2 XJ6C. If it is not fitted with a pressure cap, I may have to cut, lengthen & modify the tube to work !
The tank I ordered does not have a pressure cap which is needed for the Series 2 System. I have ordered one through eBay. I will cut the existing nozzle off and weld in the new pressure cap adapter (basically a Radiator Filler Nozzle). May or may not lengthen the tube to match the original Series 2 tank depending on what height I mount the tank.
Last edited by Excalibur2012; Mar 12, 2021 at 01:00 PM.
Reason: Clarification
Unless I need to extend the fill tube, this part will be surplus. As it turns out the vendor of the tank was incorrect and it is equipped with a Pressure Cap of unknow rating, but feels right., about 1.1 Bar. [/QUOTE]
Expansion Tank
