Dear Dave Stevens,
Hope you're well and stay so!!! Using a bottle jack allows me to supply just enough lift to compress the seal.
I suspect the pump casing was defective, i.e., that there was a fault in the metal, such that application of slight pressure caused failure. You may have dodged a bullet: a faulty casting could have failed because of heat-driven expansion and contraction cycles.
I cannot imagine that You applied so much pressure, that you actually broke a pump housing, which is a pretty beefy piece of metal.
If my guess is correct, it was better to have the casting fail in your driveway rather than on a rainy night out in the wilds!
Yours faithfully,
Spook
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