Danny Troy
Member
Gravel, 3 out of the 4 will come out. The other one (if I remember correctly is on the bottom right, closest to the bow) is the one that cannot be removed. Take the other 3 out (7/16" wrench) and loosen the other one. The cover will hang there but won't be in your way. If it's easier you can remove the 3 and totoally unscrew the last one and remove the whole pump housing so it's easier to change the impeller. Not a bad job, probably takes 10-15 minutes max.
Yes, did the same job in the Spring, and seem to remember it was straightforward. Nothing like the drive engine impeller, which was a PITA!