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ya on tha right track with tha adapter plates and motor mounts.. probably didn't cause tha "knock" though.. it probably isn't goin' away once it started.. need ta find out "whats" knockin' with a teardown.... could be a number of things but will only get worse and cause more damage as time goes...
tha "seal" in question is tha one that presses into tha end of tha crank.. it keeps water out of tha bottom of tha motor.... part number: https://www.crowleymarine.com/mercury/products/54196a6-seal-carrier-assembly (ya need all three pieces)... once it comes lose it will not stay even if ya...
tha one on top of head.. yes you will lose tha rotation sensor (strictly oiler related) but will have no effect on tha over temp sensor or alarm... tha oiler and over temp use tha same alarm buzzer but are completerly different circuits.. tha oiler module does nothing but make tha warning buzzer...
you will need this first...
https://www.buckshotracing77.com/product-page/mercury-v6-oil-block-off-kit.. 'bout any merc dealer will have it also.. its pretty self explanatory on installation after pump removal...
then you will need to remove tha oil tanks, both (be sure ta plug tha fitting...
do you have an OEM manual or it?.. if not send me an email addy and i'll send ya tha PDF for it.... it will be a big help with it.. if you know tha motors history, that can determine 'bout tha oiler or not.. if you have no clue as to how it was treated then ya might wanna delete and...
tha one in your picture is a combination reg/rectifier.. is same as as most mercs of tha early ninties up to somewhere in tha 2000's.. ready available on most parts sites.... try ta stay away for tha "real cheap" knock offs....
bad stator.......... maybe regulator also.. it sounds like ya don't have tha right stuff ta check all three pieces so.......... replace all three pieces, regulator, rectifier, stator and be done with it.............
JAN: have you used tha same head bolts? did you do tha 90* thing with 'em?.. if you don't use new bolts you might just torque ta 35 lbs and go with it...
