1989 Reinell 3.0 L GM 4 Cylinder Water Pump

[Codeman3014]

When I was Winterizing MY boat I did one last run and notice it wasn't sucking enough water r at all water thru the muffs. Once the Engine hit the right temp . First guess was bad thermostat. I check the water pump. It was spinning. MY question is, is there a pump between the muffs and the the inlet hose to engine in the Lower unit. Besides the engine Water pump. Im going to replace the thermostat and start there.

 

[Howard Sterndrive]

Re: 1989 Reinell 3.0 L GM 4 Cylinder Water Pump

muffs aren't to suck. You connect them to a garden hose and turn it on full. There is an impeller pump in the outdrive, but it's performance is moot when using muffs.
That said, the impeller in the drive should be changed every 3 to 5 years and should be changed automatically anytime it's condition or age is unknown.

 

[bruceb58]

Re: 1989 Reinell 3.0 L GM 4 Cylinder Water Pump

Unless the engine waterpump is leaking or making a noise(bearing), there is no reason to change it as its sole purpose is to circulate water in the engine and can't and won't suck water from the drive.

 

[Codeman3014]

Re: 1989 Reinell 3.0 L GM 4 Cylinder Water Pump

I ment the water pressure going into the engine wasnt very much not the muffs sucking it out. But I will check the out drive today and change it. thank you

 

[Howard Sterndrive]

Re: 1989 Reinell 3.0 L GM 4 Cylinder Water Pump

I ment the water pressure going into the engine wasnt very much

If you live in the city, the municipality determines how much water will flow out your garden hose and at what pressure.
If you are rural, it's your well pump.

Muffs are not for the impeller to suck through. That will destroy the impeller in less than 60 seconds if you attempt that.

Muffs are to direct pressure supplied water from your garden hose to the drive. Water must be on and flowing before attempting to start engine.

If that is understood, and your issue is the water not making it from the garden hose/muffs to the engine, try a woodworking clamp around the muffs, or bend them tighter. Check for kinks or restrictions in your garden hose. Check for a failed impeller - chunks of rubber can come off an old one and block the hose running up to the power steering cooler (if boat is equipped with p/s) and the hose to the thermostat housing. You can hook the hose to the engine end and try backflushing.

If you have good flow to the engine, but it can't exit, check the exhaust downpipe in to the gimbal area for a broken off water shutter/flapper.