88 excel wont pump water

[wildcatt]

Hi - My mechanic and I are trying to figure out why this engine won't pump water.

88 Excell - 2.6 lt

Last fall it was running fine when taking the boat out for the final spin of the year.
Brought the boat back to the house to fog etc, I noticed that the pee hole stream was weak. Decided it was time for a new impeller, so I fogged etc.
I've since replaced the impeller and still no pumping. The water I get is from the pressure of the hose on the muffs and is minimal - but it does come through. When it is in the lake it runs, but no water.
The mechanic has now replaced the whole pump, blown air and water directly into the pipe in the midsection and still no water pumping when put into action.

Anybody have any ideas how the water from a hose can make it through but not the water from a new pump assembly?

Were thinking that the next step is to pull the power head to see if something is blocked in there.

I'd rather not do that if at all possible

Thank you

Tom

 

[ezmobee]

Re: 88 excel wont pump water

Well you've got this post in Johnson/Evinrude and Yamaha. What motor is in/on this thing?????

 

[wildcatt]

Re: 88 excel wont pump water

Sorry about that - It's a yamaha

I've posted there after I realized it was in the wrong area

Tom

 

[mikesea]

Re: 88 excel wont pump water

"When it is in the lake it runs, but no water"What does that mean.Can you ride around and it not overheat,or you just run it a few minutes and shut down.Tell us the motor make,yr and horsepower,also,what the mechanic did for you and what the mechanic has said about the problem

 

[wildcatt]

Re: 88 excel wont pump water

1988 Yamaha excel
225
2.6 lt
v6

Only pumps a small amount of water when on the muffs
none when in the lake.
Didn't ride around - just start for min then shut down.

When on the muffs (with small amount of water coming out of pee hole) it overheats in a short amount of time. Buzzers etc going off.

New pump assembly/impeller installed - no change.

Mech is thinking of pulling powerhead to see if anything is stuck further up.

 

[rodbolt]

Re: 88 excel wont pump water

no no no.
first check the pressure control valve and the t stats.
especially if its seen salt water.
if they look good go check the rubber dam and the holder located aft and underneath the water pump wear plate for corrosion buildup.
also ANY sign of melt,even the slightest, on the pump housing is grounds to scrap it.
remove the impeller cup and carefully inspect the housing.
carefully inspect the pressure controll valve grommet, if the valve sticks open it dumps the water into the exhaust and the engine overheats at low speed.

 

[wildcatt]

Re: 88 excel wont pump water

thx Guys - hi pressure hose hooked to the mid seems to have flushed out whatever crap was in there. All is good now.

I appreciate the help

cheers

Tom!