Grrrrrr... Yanmar 1gm10 to prop woes

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I connected the remaining bits and bobs on the trident engine today , fuel system, cooling etc, all hoses etc cut to length and test fitted.
The last thing I had to do, and it was something I had foolishly imagined would be a simple matter of adjustment, was aligning the engine and the sterngear.
Height wise it is spot on, but no matter how much I adjusted the engine mounts I still cannot get a perfect alignment side to side. It is only a few thou, around 0.010.
I have a couple of choices as far as I can see, either live with it and hope it isn't going to shake itself to pieces, or remove the engine mounts and modify so both holes are slotted to allow further movement.
The oil filter is already perilously close to the engine mount cradle so I do not have a ton of room to play with at that end.
To add to the general joy of the situation, one of the captive nuts has escaped...
Tonight I shall be drowning my sorrows in sampling some half decent single malts.

Any real world input about living with slight misalignment would be welcome. My engineer instinct is the cush drive can handle it, and as I can turn the shaft easily by hand the cutlass bearing cant be too badly misaligned - But then again, what do I know, this is new to me.
 
Don’t forget it will all move again when you put her in the water and the hull takes its normal shape
 
Ten thou? Pffff, when you launch and the hull takes up its environment you will probably find it will change. The routine on ships is that the shaft is aligned afloat, sea trials performed and final alignment performed when all has had a shakedown.
 
Ten thou? That's just over a quarter of a millimeter. Just wait until you start the engine (single-cylinder?) and see how well it will do the Lambada on the resilient mountings until you go above a certain RPM. ;)

Seriously though, elongating the holes to cater for that is no big deal. With luck you can even drill out the brackets 0.5mm oversize in situ without removing them if you can lift the engine clear of the mountings.
 
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