Not getting water to crank pumps-Bravo1

[tank1949]

I just replace both Johnson impellers on both my cranks pumps. I was eating them up. Then, I connected muffs, but no water is getting to pump. Faucet is set on max water output. I disconnected hose at pump head but no water coming out of hose. Both my Bravos had been retrofitted with bravo-itus kits. The best I can tell water enters the OD's gills and comes up about 2' through upper OD and then into Bravo-itus kits and then drops about 1.5' to Johnson pump. I should get water there??? I don't want to keep eating impellers. I am going to force water into pump hose and see if water comes out of OD's gills. Motors set for over 4 years. We have a lot of mud-dobbers here. I am afraid some may have made nests in my lower OD's unit. Any suggestions??? Should I prime each pump???

 

[Bt Doctur]

If you also have low water pickups you need to block the holes on the bottom of the bullet when using muffs

 

[04fxdwgi25]

how well do the muffs seal to OD?
If muffs are old and stiff the seal may not be good enough to prime.

 

[Scott Danforth]

if you have mud daubers, hook the hose up on the inside hose, and push the stuff outward.

 

[tpenfield]

With the water intake hose disconnected from the pump and the muffs running from a garden hose, you should be getting lots of water.

With everything connected and the garden hose running, you should be getting water up to the intake hose of the thermostat housing at the top of the engine.

A common issue after working on the pump is that the intake and output hoses on the sea water pump are connected backwards . . . make sure they are on the correct sides.

 

[alldodge]

^^^Agree
Intake hose goes on top of belt driven pump

crank pumps-Bravo1​

You have crank pumps?

 

[tank1949]

With the water intake hose disconnected from the pump and the muffs running from a garden hose, you should be getting lots of water.

With everything connected and the garden hose running, you should be getting water up to the intake hose of the thermostat housing at the top of the engine.

A common issue after working on the pump is that the intake and output hoses on the sea water pump are connected backwards . . . make sure they are on the correct sides.

Looking at the front of the V8 (crank balancer), the input hose from Bravo kit connects to the lower crank pump connector. The top crank pump hose goes into heat exchanger.

 

[tank1949]

If you also have low water pickups you need to block the holes on the bottom of the bullet when using muffs

all I can see are the vertical small holes on the lower OD.

 

[Scott Danforth]

the cover on the pump will have arrow rotation and which one is inlet/outlet based on rotation. if the crank mounted johnson pump has the inlet/outlet aimed at port, the lower one is inlet, upper is outlet. rotate the pump so the ports are aimed starboard, and the pump inlet is upper, outlet is lower port.

 

[tank1949]

the cover on the pump will have arrow rotation and which one is inlet/outlet based on rotation. if the crank mounted johnson pump has the inlet/outlet aimed at port, the lower one is inlet, upper is outlet. rotate the pump so the ports are aimed starboard, and the pump inlet is upper, outlet is lower port.

I will examine cover. I believe I have it correct. Output water/hose from transom Bravo-itus kit comes from port side of each engine to crank pump.

 

[tank1949]

the cover on the pump will have arrow rotation and which one is inlet/outlet based on rotation. if the crank mounted johnson pump has the inlet/outlet aimed at port, the lower one is inlet, upper is outlet. rotate the pump so the ports are aimed starboard, and the pump inlet is upper, outlet is lower port.

No low water inlets... Attached is a photo of open pump. However, arrows on pump cover show direction to be either way. I didn't attach cover cap photo. We reversed water pressure from pump hose back through transom. No blockage. Pump hoses appear to match body pickup area (2nd photo). Input is on the bottom of pump body. Green hose.. We reattached hoses and filled up heat exchanger through anode opening on top of HE. We will try starting one of the motors tomorrow. I believe, the pump needed priming after sitting dormant for over 4 years. I will let all know. Thx!.