Originally Posted by sailorchic34
I'm with A64pilot. It's probably the water seal in the raw water pump
leaking. Only leaks
with the engine
running, at least at first.
There is a slot under the raw water pump that lets the water that leaks past the seal to drip out and not destroy the bearings. What happens is the drip falls on the hose and runs to the low point and then drips. Really hard to see when the engine is running.
Easy to replace with a pair of snap ring pliers.
Remove raw water pump.
Remove back impeller.
Remove pulley then remove snap ring.
Then pull the bearing shaft assembly out. Might have to Gently tap it out from behind. Use a Brass drift
You will find that there is a mineral buildup around the water seal and shaft. The water seal then can be tapped out.
The shaft might be scored but that's not a big deal for the first go round. So sand the shaft clean where the water seal. Sometimes that's all you need to do. But since it's apart go and replace the seal and bearings too if there is slop in them.
Take the bearings and water seal to a local bearing supply house. They should be able to give you matching ones as they are very common size. Get two water seals to have one for spare.
I'm new to this forum and joined because of a similar issue with my 1GM10
on a 1993 Hunter
26. There had been no issues until I replaced the impeller, O-ring, and gasket
this spring. I noted there was a leak so I tightened the screws but no change. So, I replaced these parts
again and applied copious Lithium grease. Then I noted a leak from the hose at the intake to the impeller. I trimmed that back and tightened on a new hose clamp. All seemed well....no leak at 1200 RPM
but when I revved to 2500 RPM
I noted a slight leak. It seems to b coming from two little vents from below the pump housing.
I read your post about a snap ring, bearings, and water seal...and shuttered. There is no dealer, supply house, or Yanmar service
for 200 miles. All the work needed in my club has to be done by ourselves and I'm not mechanically gifted.
So to summarize...no leaks were present until I performed what was supposed to be routine maintenance
, as I've done previously.
I guess I should have left well enough alone.
Any suggestions?? I'd appreciate any ideas, including condolences (!).