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sealing the GC is not hard but…tricky. Doing a few helps so check utubes . the spaghetti is tricky..consult the manual in the link provided changing oring is tricky to on the shift shaft.
if you are going to do a good job replace all seal ( drive shaft prop shaft shifter rod seal when all done and closed up do a GC pressuretest to see if it will hold around 10psi for 10 minutes.. perform a vacum test also her are a few utubes
https://www.bing.com/videos/search?q=Danbar+pressure+test&cvid=6944a0ce5cec48c2a5cf8d7b99823568&aqs=edge..69i57.13358j0j1&pglt=43&PC=U531&ru=%2fsearch%3fq%3dDanbar%2bpressure%2btest%26cvid%3d6944a0ce5cec48c2a5cf8d7b99823568%26aqs%3dedge..69i57.13358j0j1%26pglt%3d43%26FORM%3dANNTA1%26PC%3dU531&view=detail&mmscn=vwrc&mid=144AD90360F195315D84144AD90360F195315D84&FORM=WRVORC
https://www.youtube.com/watch?v=GCkpGD4bgDI
Vintage Outboard Lower Unit Gearcase Shift Rod Seal Replacement Johnson / Evinrude / OMC Part 2
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