As a last resort, you could use a strong (3/4 inch) drive socket and bar with scaffold tube extension. Jack car up, fit socket to nut, rest end of scaffold tube on ground, wedge engine. Then lower car toward ground using the weight of the car to apply force to the spanner.
Probably a reasonably safe way if/when anything slips 'cos you are the jack handle's length away from the work. Keep the wheels on the car so that if it gives suddenly nothing but the tyres hit the ground.
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