MG-Cars.info

Welcome to our Site for MG, Triumph and Austin-Healey Car Information.

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MG Y Type - Repacing water pumps

The water pump on Y6214 has leaked ever since I bought it, sometimes worse than others, other times hardly a drip, but lately a lot. After pulling it out to see what could be done, I got a new one last week to replace it.
What should have been a relatively short job is still causing me grief as the pump just won't go fully home into the engine block, stopping about 6mm short with a metallic clunk. Everything has been measured and checked and cross checked with vernier callipers, and can't find anything abnormal, all dimensions either identical or even fractionally smaller regarding the impeller and housing that goes into the block. Old pump goes back in like a charm.
The only thing I can come up with is maybe it's a bit tight on the two holes going onto the studs, or the studs maybe not be dead square mounted i.e. one may lean a fraction - very hard to be sure. There is maybe 0.5 to nearly a mm less distance between the two holes in the new pump. I've already opened them up a fraction, might try a bit more tomorrow, but if that is the problem it seems strange to get such a thud when pushing the pump in when it stops. I even mounted the two pumps, in turn, on 4 set screws bolted to a steel plate to check that the impellers are both lining up the same - spot on.
It's not striking the top of the timing cover or anywhere else externally. Digital cameras are great tools for getting down to look at things where you can't get your eyeballs, but still can't see any problems.
Has anyone struck a similar problem?
John Turner
J B Turner

Hello JB. You say you have checked all dimensions. From your description it sounds like the holes for the studs were not drilled in the correct location in the pump body and is causing the the housing of the pump to contact the block before sliding home. I know that there was a batch of castings a while back that were cast oversize on the bottom edge which caused interferance with the timing cover.

Butch Taras
VMG
R Taras

JB just another thought. Where ever the interrferance is should leave a shiny spot on both the block and the pump.

Butch
R Taras

Can you post any pictures John, I think that I had a problem once - I cannot remember what it was now, something like the timming cover or stud position! I think these pumps are sometimes made for the TF. To add to Butch comments perhaps you could cover the pump with a smear of grease or engineers blue and see where it ends up
B Mellem

Thanks for your comments everyone. Apart from showing a couple of club friends haven't been near it tonight - planning on an enlarging job of one of the two holes for the studs as that was about the thing we could see possibly being a problem. Picture shows the housing.
John

J B Turner

And this picture shows that there is a clearance between the pump and the timing cover - as well as a bit of flakey paint.

J B Turner

It's in - or it will be when I go back to finish it. Drilled out one of the two stud holes by no more than a few thou and the pump now slides fully home easily. Still can't understand why it stopped with a very solid 'clunk' as if it was hitting something solid.

Don't wonder why John, just go and finish it.

Cheers everybody.
J B Turner

This thread was discussed between 17/04/2012 and 21/04/2012

MG MG Y Type index

This thread is from the archives. Join the live MG MG Y Type BBS now