You need a radiator cap designed for coolant recovery. This will have a
brass valve in the middle of the sealing rubber - which has a very light
spring so that a very slight low pressure in the cooling system will
suck fluid back through the valve.
For any other car, you could go to an auto parts store and just get a
generic 7 psi coolant recovery radiator cap. I'm told an MGA has a
deeper-than-generic neck in the radiator. You could probably take your
cap down to a decent parts store and have them match it up with one that
has the proper depth. Elsewise, an MGA owner may jump in here and help
you with a part number.
>>> "Eric R. Stephen" <bk996@freenet.carleton.ca> 07/13/98 03:17pm >>>
I scavaged a coolant overflow unit off a Mazda in our local recycled car
lots (junk yard). I hooked this up to the overflow pipe on the radiator
neck hoping to avoid the constant loss of antifreeze I have been
experiencing from the moment I purchased the MGA last spring. The
radiator currently has a 7PSI cap. The coolant recovery system is
recovering fluid overflow but the system is not sucking the fluid back
into the radiator when the engine cools. I have to physically remove
the antifreeze from the overflow unit with a turkey baster (dedicated)
and add it back into the radiator. The overflow tube was flared and
soldered on the neck end and is air tight (vacuum check). What am I
doing wrong??
Eric
|