SEI 106 drive / Mercruiser 228 / raw water cooled.
Yesterday, about three minutes after applying cruise power I happened to notice the temp gauge trending towards the upper limit of the scale and by the time I had bought the boat to a stop it had climbed into the red. This was after I had motored out of the harbour chanel at around 1500rpm for ten minutes and temp in the normal range. I shut the engine off, let it cool for about half an hour and fired it up again. It started straight away and idled smoothly, but the temp gauge was clearly heading north, so I got a tow back home.
Today I pulled the drive off and as I expected I found the raw water pump impeller had failed. This is an SEI drive, about two years old and only done around 60hrs.
Upon further inspection I can see no damage to the pump housing or water pocket cover in the upper drive. Hopefully I shut the engine off before any further damage was done, but what else should I check? I've heard that exhaust shutters and rubber exhaust couplings can be affected by a lack of cooling water flow, but how can I check them without disassembling half the boat? What about manifold and riser gaskets?
Cheers
Yesterday, about three minutes after applying cruise power I happened to notice the temp gauge trending towards the upper limit of the scale and by the time I had bought the boat to a stop it had climbed into the red. This was after I had motored out of the harbour chanel at around 1500rpm for ten minutes and temp in the normal range. I shut the engine off, let it cool for about half an hour and fired it up again. It started straight away and idled smoothly, but the temp gauge was clearly heading north, so I got a tow back home.
Today I pulled the drive off and as I expected I found the raw water pump impeller had failed. This is an SEI drive, about two years old and only done around 60hrs.
Upon further inspection I can see no damage to the pump housing or water pocket cover in the upper drive. Hopefully I shut the engine off before any further damage was done, but what else should I check? I've heard that exhaust shutters and rubber exhaust couplings can be affected by a lack of cooling water flow, but how can I check them without disassembling half the boat? What about manifold and riser gaskets?
Cheers