7.5 merc NO water over heating

[mauiboy]

I have a 7.5 hp merc no tags on what model or sn # it has a blue ad silver cowl strips
my prob is that I changed the water pump and impeller and I still have no water coming out and the motor is getting hot. every thing is installed properly. I blew air in the pee hole and it did not seeamed to be blocked

 

[mauiboy]

Re: 7.5 merc NO water over heating

can anyone assist with my prob

 

[58rude]

Re: 7.5 merc NO water over heating

Need too make sure the pump is lined up with tube going to powerhead. Also check the intake screen on the skeg to see if it is clogged. You just have too troubleshoot it. Hard for us to help out, not knowing what year it is etc.

 

[RadarRick]

Re: 7.5 merc NO water over heating

If the intake tube is lined up & screen is not blocked, you should try forcing some water up the tube (from garden hose). the water should flow through the block & out of the tell tale. If it doesn't, you can try pushing weed whacker line up tell-tale tube. Sometimes, crap gets stuck in that tube. You can also remove thermostat & check for water flow there. That's another spot where crud collects and could block flow.

 

[mauiboy]

Re: 7.5 merc NO water over heating

Thaks radar Ill try that not sure where the thromostate is

 

[RadarRick]

Re: 7.5 merc NO water over heating

The thermostat itself is part # 31 on this diagram:
http://www.crowleymarine.com/mercury-outboard/parts/297_80.cfm
This is a diagram from an 82 7.5hp. Hopefully yours will be similar.

The thermostat is on the port side of the cylinder block and is held in place with a spring.

 

[bktheking]

Re: 7.5 merc NO water over heating

Those 7.5 impellers are small and break, were all the vanes in tact on the old impeller?

 

[mauiboy]

Re: 7.5 merc NO water over heating

Yes brand new Impellar, Thanks Raidar Ill check on that this weekend,
Can anyone tell me how I can find what year and model this motor is. the area that it normaly is has been painted by the prev owener

 

[bktheking]

Re: 7.5 merc NO water over heating

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Those 7.5 impellers are small and break, were all the vanes in tact on the old impeller?

Anyways, the telltale and thermostat have nothing to do with each other, stat can be shot and you still get water coming from the telltale. Those impellers break and the reminants get stuck in the housing and if you don't pay attention and clean them out you will be pumping water into a mess of broken impeller blades stuck in the housing and perhaps in the water tube.

The model is a serial number found on a plate on the transom clamps, sand off the old paint and check for the SN.