RE: 40 hp merc won't start

[rcb130]

RE: 40 hp merc won't start

Laddies, Rodc, Amd Rules; Thanks for the previous tips. Cleaned carbs and engine now starts and will run. I am still afraid to let it run more than 5-10 <br />seconds. I am not seeing any water. This motor does have a thermostat. How long can I run without seeing water and not damage powerhead? How do you check water pump, remove thermostat and look for water?

 

[AMD Rules]

Re: RE: 40 hp merc won't start

Glad to hear you have it running. My first suggestion is to reply to your original topic rather than creating a new one. No big deal, but it helps others to see the history and provide additional ideas/thoughts.<br /><br />Im surprised your 40hp has a thermostat, most don't.<br /><br />If it were me I'd try revving the throttle just slightly (~1000rpm) for 30 seconds or so to give the water a chance to show up.<br /><br />If you don't know the last time the water pump was inspected, I would highly recommend it. As a minimum, its a good idea to put in a new impeller. The process invloves removing the lower unit. A service manual is a good idea. Its pretty easy, but the manual would show you step by step what is required.<br /><br />Are you running the motor on muffs, or submerged in water?

 

[Laddies]

Re: RE: 40 hp merc won't start

If you have a set of muffs put them on the engine and turn the water high if the water comes out of the telltale you have for sure a bad impeller if not start it and see if it pumps when, you will not hurt your engine if it runs for a minite or so at idle with out the pump working

 

[rcb130]

Re: RE: 40 hp merc won't start

Sorry I do not have a thermostat. I was relying on info from the service book. The Merc site shows no t'stat for this motor. I am running on muffs. I plan to replace the impeller if the pump will not produce water after 1 min of run time. I'll be back to let you know the results.<br />Thanks again for the help.