Merc 15hp Water Troubles

[lakesidefoxfarm]

Can someone please help me with my problem. I have a 1997 15hp Merc that hasn't been run in 3 years. When I first started it there was no water coming out of the motor. I figured it was the impeller so I replaced it. While I had it apart I took the thermostat out and poured water in and made sure it came out the copper pipe by the lower unit. It did flow out very well. I installed the impeller so the fins are making a sweeping motion which is the way I thought I took it out. I then continued to check the copper water inlet pipe to make sure it wasn't plugged. It was clear. I reassembled everything and tried running the motor and still no water flow. I continued to remove the thermostat and tried running it again with the same results. Today I contacted my local Mercury dealer and asked if there was a gasket/seal set for the water pump assembly and he told me no. I find this very hard to believe being there are gaskets and seals on the unit. But anyway if someone has any suggestions please let me know. This is driving me crazy. Its seems like such a simple concept but I'm at a loss and what to do next. I really don't want to have to bring it in and have it fixed. I have replaced impellers before on different motors with no problems at all. Thanks in advance. Gary

 

[bgbass.1]

Re: Merc 15hp Water Troubles

are the impella fins facing clock wise?try taking a hose either air or water and run up the pipe.what gasket do you need ?

 

[bgbass.1]

Re: Merc 15hp Water Troubles

I see which one the merc. # 27192051 hope this helps

 

[Ramair]

Re: Merc 15hp Water Troubles

Hi, Just wondering if you figured this one out yet?

I have just acquired a late 90's 15 and notice that hardly any cooling water comes out when idling. Thinking it's due to the thermostat since I also put a new impeller in but have the same result.

There is lots of flow when WOT. Just doesn't seem right but I asked a local merc mechanic and he said that was normal???? This sound right guys?

 

[tigerhack]

Need Help , with 1992 regal 233xl

Need Help , with 1992 regal 233xl

sorry to hijack this thread but i cant post , can i (t) off the water pump hose at the back close to the pick up ,to supply water for my air condition ?, or that method will cause trouble (over heating ) i dont want to put any hole in my hull .