Couple of details you missed. Use a torque wrench for bolts. Bolt tightening torque 12mm 6 LU 27’# (10x45mm) 12mm 1 Zinc 31’# (10x45mm) 4 water pump housing 13’# You didn’t pack the three metal washers that fit over the shaft correctly. There are three washers. The flat washers go on top and bottom. The wavy washer goes in the middle. You only used two washers. When placing the plastic part on the shaft you need to pull up on the shaft so the plastic piece is correctly seated. If not you will get prop chatter when shifting into idle.
