Tom
Administrator
- Joined
- Jan 13, 2005
- Posts
- 52,017
Boats with "fresh water cooling" systems rely on one or more sea water pumps to pump 'raw' water through various cooling system components/heat exchangers. We have 3 such pumps (2 engines and generator).
Our 3196 big CATs were in need of service, and we caught the (4" x 3.5") impellers in the main sea water pumps in time. The first two photos show a 'used' impeller (1 of 2) that I had on board for emergency use; You can see the slight 'set' that it had taken, and the beginning of a tear in one fin. The other two photos show what came out of the pumps this time around; Serious 'sets' and pieces of impeller missing.
I haven't seen them gone this far in the years we've owned the boat. Surprisingly, they still moved a lot of water when the engines were fired up before replacing the impellers.
Our 3196 big CATs were in need of service, and we caught the (4" x 3.5") impellers in the main sea water pumps in time. The first two photos show a 'used' impeller (1 of 2) that I had on board for emergency use; You can see the slight 'set' that it had taken, and the beginning of a tear in one fin. The other two photos show what came out of the pumps this time around; Serious 'sets' and pieces of impeller missing.
I haven't seen them gone this far in the years we've owned the boat. Surprisingly, they still moved a lot of water when the engines were fired up before replacing the impellers.