No water flow when using muffs ?sea pump failure

[harleyfool]

2000 Regal 1800 LSR - Volvo 4.3 GL

Pulled the boat out of water after 4 hours of salt water use over 3 days. Put muffs on the stern drive and turned on the hose, started the engine. After about 15 seconds realized there was no water return. Shut off the engine and noted the water gauge temperature was 185. Engine had been running fine until this point. I must admit I had not been keeping a close eye on the temp gauge during recent runs as it is partially hidden by the GPS unit.

Do you think the lack of water return is a failed sea water pump? vs. impeller? Not knowing how long the engine ran hot how do I know if it was damaged? and what would be the most likely damage??

Thanks

 

[Don S]

Re: No water flow when using muffs ?sea pump failure

Do you think the lack of water return is a failed sea water pump? vs. impeller?

Only way to know is to pull the impeller and look.

Low water pressure or volume from a hose can cause them to not get enough water to cool. Low pressure systems and LOOOOOOOONG hoses (over 75') are common problems.

 

[lillbush]

Re: No water flow when using muffs ?sea pump failure

I had the same problem...I changed the impeller, then the recirct pump and still had the issue. Turned out to be the thermostat! Check that out 2nd after the impeller. Hope this helps!

Matt