These are the two nuts and washer being referred to, #’s 39 and 40. Also, when undoing the seven screws holding the powerhead on, check them for length as some motors had a few screws which were slightly shorter than the rest. The short one always goes to the rear as this hole goes thru the water jacket and if a long one is used, it could contact the cylinder causing problems. A bit of sealer on the threads will prevent any leaks.
If the powerhead screws are hard to remove, an extension for a hand held impact driver can be made out of a cheap extension found at a garage sale or flea market.
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