Checking water flow on Alpha drive

[crazy charlie]

I need to check for proper water flow on my alpha drive.I have a rising temp at idle speed condition.Which is the best hose to replece with a clear test hose and does anyone know the exact size of the hose.I have.Twin 1988 Mercruiser 5.0 XL RWC with alphs drives.Charlie

 

[Bt Doctur]

Re: Checking water flow on Alpha drive

At idle you really wont see bubbles, when were the impellers replaced last?

 

[jerryjerry05]

Re: Checking water flow on Alpha drive

You just unhook the hose from the drive.Start it and see how much water is pumping.At idle it should fill a bucket FAST!!.Rev it up and see if it pumps more.This needs to be done in the water.A hose just don't have enough water.
Next. How old are the risers/manifolds?If they are original it's probably time to change them.Last time you changed the impeller?Run it in the mud latley?
Change the thermostat.Post your results.J

 

[crazy charlie]

Re: Checking water flow on Alpha drive

Thanks for the reply.Still dont know what hose you are referring to.There is transom to power steering cooler hose,then a power steering to Tstat housing.This has ben an ongoing problem for a number of years.Troubleshooting it ,I have replaced the risers and manifolds,circulator pump,o/d impeller and housing every season,tstat,cleaned and adjusted pressure balls.I know more water pumps when I raise rpms while in neutral.Thats how I bring temp back down when it starts climbing.Very frustrating Charlie