Water pumps

Post by **youngun** » Mon Jun 16, 2008 9:29 pm

Just been looking around, there seems to be a number of different water pumps about, for the 948 1098 and 803 models of engine. Are these all interchangable?

thanks,
YG

Post by **aupickup** » Mon Jun 16, 2008 9:41 pm

early ones no but later ones yes

ie 803 no

948 and 1098 yes

Post by **bmcecosse** » Mon Jun 16, 2008 9:43 pm

I think not the 803 - it's slightly different. 948 and 1098/1275 pumps are all much of a muchness - although later pumps have a thicker impeller which can foul on the block when installed - either grind a bit off the pump or carefully relieve the block. Be wary of pumps for later Minis - which don't have a lug for the alternator !

Post by **aupickup** » Mon Jun 16, 2008 9:46 pm

thats what i said

Post by **bmcecosse** » Mon Jun 16, 2008 9:49 pm

We cross posted! Your post must have come up while I was typing. At least we both agree!!

Post by **aupickup** » Mon Jun 16, 2008 10:11 pm

Post by **Matt** » Mon Jun 16, 2008 10:46 pm

And remember there are pumps with and without bypass hoses.

Post by **bmcecosse** » Mon Jun 16, 2008 10:58 pm

Good excuse to get rid of the dreadful bypass hose!

Post by **Peetee** » Mon Jun 16, 2008 11:43 pm

Bypass fitment aside, there are two main types of similar (if not identical) outward design. The difference is in the pump impeller. One stands proud of the pump casing about 6mm more than the other and is not compatible with all the 948 engines. Either are fine for the 1098 or 1275 engine.

Post by **bmcecosse** » Wed Jun 18, 2008 12:35 pm

But it is a better pump - hence the suggestion to carefully relieve the block, or take a little bit (just an edge really) off the pump.