new water pump, not cooling

[57whitehouse]

1957 gale 25hp. i just put in a new water pump and when i started it last night, there was not mist comming out of the exhaust and the motor heated up. i had the lower unit in a tub of water and the intakes were in the water. before i put in the new pump, i had it out on the lake and noticed a mist out of the exhaust. i'm possitive the impellor was turned the right way when placed in housing.

do you think maybe i didn't get the tube lined up? would it still go back together smoothly if that tube wasn't lined up?

i also noted that it was moore difficult to start and keep running than the first time i started it 3 weeks ago. it also ran ruff idle like it was missing. spark plugs after running it had light brown color, no oily residue, top and bottom plug looked identicle. this is the motor that sat for 25 yrs in a garage without being started.

 

[tashasdaddy]

Re: new water pump, not cooling

they have to be submerge 1/2 way up the leg to prime. water has to be above the pump.

 

[57whitehouse]

Re: new water pump, not cooling

any idea's on the ruff idle? also does the exhaust come out the prop too. there were a lot of bubble in the water.

what kind of muffs do you use for this motor? the holes for the water intake are very close to the little rim where it comes apart. can't seal around it with roung muff.

 

[57whitehouse]

Re: new water pump, not cooling

...

 

[57whitehouse]

Re: new water pump, not cooling

...

 

[tashasdaddy]

Re: new water pump, not cooling

those are not the water intakes, it's just above the prop. you can not run on muffs. did you loose the rubber grommet the goes into the impeller housing, for the water tube. #23 # 15 is the screen in the water intake.

 

[57whitehouse]

Re: new water pump, not cooling

the grommet is new and in place.

if the water was above the holes i mentioned earlier, is that high enough up the shaft? (approx. 16inches from bottom)

attatchment too small to see

 

[tashasdaddy]

Re: new water pump, not cooling

water needs to be above the hump just below the bottom of the transom bracket

 

[57whitehouse]

Re: new water pump, not cooling

here's a stupid human trick i just remembered. the boat didn't come with a battery when i bought it. the cables were old and not red and black. after i replaced the water pump last week and took it out to the lake, i hooked up the battery cables backward and tried to start it. it caughed and sputtered like it wanted to start.

is it possible the starter spun the motor backward and in-turn the water pump impellor spun backward and sheered off?

could that be why it idles ruff?

 

[tashasdaddy]

Re: new water pump, not cooling

a 2 cycle is possible to run backwards, but most starters are inertia driven, for the gear to move up the shaft to engage the motor. but any thing is possible.

 

[tashasdaddy]

Re: new water pump, not cooling

i have in the last couple of weeks gotten 2 bad impellers. that disintergrated on start up. and i'm suspicous of the one in my 35 hp. as it is not cooling. but haven't had time to get back in to it.

 

[57whitehouse]

Re: new water pump, not cooling

so do you think the water tube is in place in the grommet if it went back together smoothly?

still wonder about the ruff idle ( i know it's spelled rough, just easier ruff)

ps great looking motor

 

[tashasdaddy]

Re: new water pump, not cooling

i fought a carb on the 71 50 for 4 days, i get **** off and have to walk away from it. took it apart 5 times.

 

[Lodgepole]

Re: new water pump, not cooling

Take it back apart and check to see if impeller is ok and everything is lined up. While you are at it be sure the drive key between the impeller and shaft is in place.

 

[57whitehouse]

Re: new water pump, not cooling

ok, i got home tonight, took everything back apart, everything is in perfect order. i reassembled everything and this time i put a trashbag over the lower unit and filled it with water so it was submerged half way up. water came flooding out the exhaust port and the motor kept cool. thank you all for the advice.

one more thing, the motor ran perfectly while just in the bucket, but when i put the trash bag over the lower unit and filled it, the motor would run smooth for a few seconds and then sputter a few seconds, run smooth and sputter. any ideas?

 

[tashasdaddy]

Re: new water pump, not cooling

this should take care of that:

--------------------------------------------------
(Carburetor Adjustments - Two Adjustable N/Vs)
(J. Reeves)

Initial settings are: Bottom high speed = seat gently, then open 1 turn out. Top slow speed = seat gently, then open 1-1/2 turns.

Setting the high and low needle valves properly:

NOTE: For engines that DO NOT have a shift selection, obviously there is no NEUTRAL position. Simply lower the rpms to the lowest setting to obtain the low speed needle va /lve adjustment.

(High Speed) Start engine (it will run pretty rough), shift into forward gear, take up to full throttle. In segments of 1/8 turn, wating for the engine to respond between turns, start turning in the bottom high speed needle valve. You'll reach a point whereas the engine will either start to die out or spit back (sounds like a mild backfire). At that point, back out the needle valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest setting.

(Low Speed) Slow the engine down to where it just stays running. Shift into neutral. Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back. Again, at that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

When you have finished the above adjustments, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

 

[57whitehouse]

Re: new water pump, not cooling

4 weeks ago when i first took it out it ran rough at first and then picked up and ran great. i took it out on the lake today thinking it would do the same thing. it idled up and down like in the above post, like it was starving for fuel. i had my friend squeeze the primer bulb just for fun, and it took right off with no hesitation. when he stopped squeezing it went back to the rough idle. then it died and would not restart.

I'm thinking filter, or maybe pump.

if it's the filter, how do i clean these old ones?

 

[tashasdaddy]

Re: new water pump, not cooling

check with laingsoutboards.com call Jeff, he's great. they list the round filter and several pumps. so call him so you get the right one.