American MGB Association

North America's oldest, largest and best club for all year MGBs, MGB-GTs and Midgets!!  Established in 1975.


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for all year MGBs, MGB-GTs and Midgets
Established in 1975

Phone/Text: 773-769-7084

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this is an excerpt from the articles appearing in the OCTAGON

also see upkeep and performance hints on our message board at
and on our Facebook group at

Water Pump

Q:     I need assistance with my 18GB engine water pump. Ordered one from Moss but not the same as broken one I took off. Need help with correct replacement. Do I need to get a different pulley perhaps to align with crankshaft pulley. Thanks for any assistance. Pictures show old and new.

Phil Bradley

Water Pump Q & A Water Pump Q & A  Water Pump Q & A

A:     You have a two-groove pulley on an 18GB motor? That's incorrect. You should only have a one-groove pulley. The pulley only had one belt. It went from the crank, water pump, and generator. There is no second belt,

But, to keep things simple, probably best just to order the later water pump. The one they sent you is for the GB motor. Your "original" was not original.

It is not original. You have a '72 B. I assumed it to be in the 64-67 range because of the GB motor. Somebody put an early engine into your MkII MGB.

That's actually better in my opinion. The GB motor is considered superior to the later ones by most folks.

I'm guessing that you have quite a few mods on that car. Different back and front plates as well to adapt to the later all-synchro trans, later starter, etc. etc. They adapted an early engine to fit your '72.

Brian Maesk

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