So my impeller crapped out this weekend. After I pull the sea-water pump off, I could only recover what looked to be half of it from the housing and the liquid to liquid cooler. This is on a v-drive merc 350 mag. Where did the rest of it go? Will the remainder flush out on its own or is there some way to back flush the system? The holes in the cooler are pencil size so i'm sure that some got through to the next stage, which I believe is the recirc pump. Thanks in advance for your help.