Mercruiser 3.0 Alpha One Gen 2 Barrel

Drock1979

Cadet
Joined
Sep 12, 2023
Messages
26
Hello All.

I don't have access to water where I am looking to do some work on my boat. What measurements of a barrel or tub, etc would I need to put the lower end into, to test water impeller and few other items???
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,955
Never run in a barrel unless you can float the whole boat

Use muffs on land
 

matt167

Captain
Joined
Sep 27, 2012
Messages
3,845
A deep storage tote should be deep enough. The yellow and black ones from a home center. I’d recommend modifying it with a drain spigot. From experience
 

Drock1979

Cadet
Joined
Sep 12, 2023
Messages
26
A deep storage tote should be deep enough. The yellow and black ones from a home center. I’d recommend modifying it with a drain spigot. From experience
Matt,

Would you have measurements that I would need? Width by length by depth?
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,955
Scott,

As mentioned don't have access to water... any other suggestions it only to test water pickup. So maybe 5 mins running.
You need to get the water level a good 8" above the raw water pump when you start.

You will find the boat is in the way to do so
 

Drock1979

Cadet
Joined
Sep 12, 2023
Messages
26
You need to get the water level a good 8" above the raw water pump when you start.

You will find the boat is in the way to do so
Scott,

Ok good to know...

8" above may I ask why? Muffs wouldn't get the water no where near that high.
 

04fxdwgi25

Chief Petty Officer
Joined
Mar 25, 2022
Messages
479
Scott,

Ok good to know...

8" above may I ask why? Muffs wouldn't get the water no where near that high.
Perhaps I am unsure what point you are trying to make, but......
Ummmm. The muffs are run on a garden hose under pressure. Therefore, the raw water pump wouldn't need to pull a suction to draw water (lift) to prime it. The hose pressure forces the water to the pump to prime it.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,955
Scott,

Ok good to know...

8" above may I ask why? Muffs wouldn't get the water no where near that high.
impellers push water. they do not draw water

a hose will push the water to the impeller
 

roffey

Commander
Joined
Nov 22, 2012
Messages
2,194
Speaking of water muffs,,, a few years back I started my boat up in the drive way... all ran perfectly. I put the boat in the water and ran it for maybe 5 or 6 min. then it over heated.. keeping in mine I was 5 or 6 min. down the lake... Short story was my impeller had spun on the lower unit shaft. The muffs worked and the impeller did not, I had to paddle a 21 foot boat back to the dock...
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,348
Gee, as I understand That should not happen. The keyway should work to prevent that
 

Stinnett21

Chief Petty Officer
Joined
Jun 24, 2012
Messages
465
impellers push water. they do not draw water

a hose will push the water to the impeller
They must draw at least some because back in the day before I knew any better I used that stupid pan that attached to the lower unit where you pour antifreeze into. I guess it worked well enough because the block was ok next season. Guess i got lucky. Now in the internet era I get what you say...to work properly the impeller needs to be submerged in water. Drock, if you have no water how would you fill a tub anyway? If you can fill a container maybe use an electric pump, i.e. bilge pump to muffs. Buy a kiddy pool to put below the outdrive so you don't loose water and submerge the pump.
 

Drock1979

Cadet
Joined
Sep 12, 2023
Messages
26
They must draw at least some because back in the day before I knew any better I used that stupid pan that attached to the lower unit where you pour antifreeze into. I guess it worked well enough because the block was ok next season. Guess i got lucky. Now in the internet era I get what you say...to work properly the impeller needs to be submerged in water. Drock, if you have no water how would you fill a tub anyway? If you can fill a container maybe use an electric pump, i.e. bilge pump to muffs. Buy a kiddy pool to put below the outdrive so you don't loose water and submerge the pump.
Stinnett,

Your bang on was going to use the big blue water jugs from like on top of a water cooled to bring water to the boat for testing.

Issue is with a pump how many gph or litres would I need to ensure it's safe for my engine.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,955
At idle, your raw water pump will pump 10 GPM +/-

However I would not run it without muffs
 
Top