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[Airslot]

The engine coupler is just like a prop hub. The splined shaft to the outdrive slides into it and then it bolts to the engine. They give way with age due to heat. The purpose of the rubber coupler is to keep from breaking the crank if you take a shot to the outdrive.
The motor mounts have some adjustment built into them. If things aren't lined up right you will have virabtion problems and probably wear out gimbal bearings pretty fast. Most times the dealer you buy parts from will let you borrow the alignment tool. It's just an input shaft from the out drive that hasa a handle on it. If it goes through the gimbal bearing into the coupler smoothly then your good to go.

Airslot