>I think the Alpine ser V 1725 pump is the same as the series 3 and 4
1600cc,
>but earlier ser 1 and 2 pump had a different body / spindle length /
fan
>offset and is not interchangeable.
>the later Arrow / Hunter 1725 pump is completely different.
>
>Andy, in Glasgow
I am not so certain of this.
The series 1 and 2s had the cross flow radiator, which had an expansion chamber mounted to the thermo housing. The chamber required a second port thats purpose was perhaps to de-stagnate the water in the chamber.
These pumps have a "Y" pipe where normally the single heater return is located on the later pumps.
I have used a SV pump on the earlier cars in a pinch, and other than making up an in-line "T" to compensate for the lack of one on the pump, all worked out well.
Cheers,
Jarrid Gross