Flushing adapter on 150 Yamaha...good or bad idea

BTurville · #1 January 9th, 2003, 05:59 AM

1997 Yamaha ProV 15o: experience overheating alarm when using flushing adapter. Someone told me that Yamaha does not recommend running large Yamaha motors on flushing adapter? I do not have the owners manual for this motor. Does anyone have the straight scoope on this. Also where can I get a used owner's manual for this motor?

Thank in advance

Bill

grandx · #2 January 9th, 2003, 06:07 AM

Are you speaking of the "ear muffs" which fit over the lower unit or the hose connection at the power head? Should not over heat with muffs on and should not run engine with hose connection up top. I'm not a yammy expert, but that's the procedure for Mercs.

BTurville · #3 January 9th, 2003, 06:25 AM

I was using the muffs and got an overheating alarm.

Forktail · #4 January 9th, 2003, 07:08 AM

The muffs always worked fine on my Pro-V 150's.

If the alarm never goes off under normal use, but does go off on the muffs, then the muffs aren't supplying enough water or water pressure.

You could have a weak water pump. Or maybe the hose on the muffs is kinked (especially at the fitting)? Maybe the outboard's intake screens are clogged (I've seen wax-happy owners plug them right up)? When it's on the muffs is water shooting out of the pisser in a large stream with force? How about under normal use?

BTurville · #5 January 9th, 2003, 07:43 AM

In normal use it shoots out in a solid stream, on the muffs it comes out much slower with breaks. I was told not to use too much water pressure for fear it would screw up the pump impeller? Your thoughts?

mattttt25 · #6 January 9th, 2003, 08:00 AM

muffs should work. someone will eventually say it, so i'll beat them to it- buy the manual (available on this site) and follow what it says. they will recommend what flow to use from the garden hose, but i don't know many people that know the psi of their garden hose output. i always use about 3/4 open. good luck-

grandx · #7 January 9th, 2003, 10:58 AM

doesn't sound on the water... pump is ok

sounds with the muffs attached... not enough water getting through to the head... muff not installed over pick up or not enough water coming through hose.

I'd like to see the garden hose pressure that can damage the outboard pump... thats BS, turn the thing on and try it again, make sure the muffs are over the pick up and i'll bet you won't get alarm.

Gold Bear · #8 January 9th, 2003, 12:03 PM

BTurville

Turn the water pressure up until some "extra" water starts squirting out around the perimeter of the muffs. That is when you know you have got plenty of water pressure. In other words - the cooling system is holding all of the water it can, plus a little extra.

You will not hurt the impeller.

Good Luck,

Gold Bear

Forktail · #9 January 9th, 2003, 01:22 PM

"I was told not to use too much water pressure for fear it would screw up the pump impeller?"

Ah....that probably explains it.

Turn the faucet wide open and let the water run all over the place.

When the outboard is idling in the water the water pump is usually below the water line, so the need to overcome gravity in order to push the water up to the pump is not needed. And when the outboard is under motion there is a force of pressure as the motor runs through the water that helps force the water into the pump. In short you are trying to duplicate these situations by forcing water up to the pump and overcoming gravity.

You can't hurt the outboard's water pump with a garden hose and house pressure. Crank it up. Any excess water will find it's way out of the muffs.