Hi all,

I just commisssioned my 19 ft Wellcraft for the summer season. After 6
months of storage in the mid-atlanta, the engine started after a few
moments and everything to seemed to be running fine. After about 10
minutes bringing the water temp to a stable 160 degress, I reved the RPM
to under 4000 and moments after that the water temp heated excessively and
all circulation stopped. There was no unusual noised from the water pump
prior to overheating. I have an Aplha-1 NG V-6 175 mercruiser. The water
pump was changed last season. Any thoughts or suggestions are
appreciated. Could it be the lower unit pump/impeller or thermostat?
Thanks

Sounds to me like the L.U water pump. But is your Merc Fresh or Raw water cool

In article outboats.com,
says...

Hi all,

I just commisssioned my 19 ft Wellcraft for the summer season. After 6
months of storage in the mid-atlanta, the engine started after a few
moments and everything to seemed to be running fine. After about 10
minutes bringing the water temp to a stable 160 degress, I reved the RPM
to under 4000 and moments after that the water temp heated excessively and
all circulation stopped. There was no unusual noised from the water pump
prior to overheating. I have an Aplha-1 NG V-6 175 mercruiser. The water
pump was changed last season. Any thoughts or suggestions are
appreciated. Could it be the lower unit pump/impeller or thermostat?
Thanks

There's a waterpump in the lower unit which should be changed every 2 years.
Sooner if in sal****er. So... when was yours last replaced?

"vikingpilot" wrote in message
lkaboutboats.com...
Hi all,

I just commisssioned my 19 ft Wellcraft for the summer season. After 6
months of storage in the mid-atlanta, the engine started after a few
moments and everything to seemed to be running fine. After about 10
minutes bringing the water temp to a stable 160 degress, I reved the RPM
to under 4000 and moments after that the water temp heated excessively and
all circulation stopped. There was no unusual noised from the water pump
prior to overheating. I have an Aplha-1 NG V-6 175 mercruiser. The water
pump was changed last season. Any thoughts or suggestions are
appreciated. Could it be the lower unit pump/impeller or thermostat?
Thanks

The lower unit pump has not been replaced in at least two years...I'm
probably headed in that direction. How difficult would it be to replace
or should I leave that to the experts? Thanks for the advice

Not hard at all if you got the manual. I did mine in under 2 hours... and I
stopped to eat lunch.

"vikingpilot" wrote in message
lkaboutboats.com...
The lower unit pump has not been replaced in at least two years...I'm
probably headed in that direction. How difficult would it be to replace
or should I leave that to the experts? Thanks for the advice