CAl 33-2 Yanmar 3GM30F Engine Raw Water Pump

Fixed the leak in the raw water pump today. Water was leaking though the weep hole in the pump body. I enlisted the help of a mechanic I worked with in a previous life. Problem was seals. For benefit of others who may have to do this in the future and are not familiar with the pump, here is some information. Pump requires two rubber seals, one a simple neoprene or rubber washer called the water seal. The second one is a more complex neoprene seal that has a metal internal structure surrounded by rubber with a small spring circling the collar part of the seal. This small spring helps maintain a seal against the shaft. You must be careful not to dislodge this spring when installing the seal. Also, as you look through the hole in the rubber seal, it is slightly tapered. Observe this closely, because it is easy to put this oil seal in upside down. Pay attention to this funnel--place the seal in the pump housing so that the shaft enters from the wide end of the slight funnel. Both seals were about $10. The pump comes apart easily, and no bearing puller is needed. Only special tool is a hose clamp tool to remove the circlip on the shaft. In taking mine apart, the oil seal had disentegrated into three or four separate pieces. This was the root cause of the leak. The pump reassembled easily without a press; put it on boat and no leaks! Travis