1992 Johnson 25 HP Impeller

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

the housing looked good. the impeller was bad.

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

Not unless it got steaming hot, i had a 25hp like yours i could not get to pee correctly and had to replace the housing,gaskets and everything the old housing was warpped from getting to hot. something to think about, impeelers like yours are easy to inspect..

What do you mean?

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

the stat is good but i am going to relace it anyways since it is only $12.00

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

Okay I took everything apart and everything seemed to be in good shape all line clear the tube was in all seals looked good. Could the impeller be in upside down?


waht is the Vernithem?
is the impeller supposed to run clockwise or counter?



Also ther is steam coming out of the pee hole.

Is there a delay for the pee hole for when the stat opens up ?

 

[Haffiman]

Re: 1992 Johnson 25 HP Impeller

Pull down the gearhousing and attach the water hose directly onto the tube. Open carefully.
With thermostat installed, water should come out of the pee-hose. If not, check that hose, nipples are not blocked in any way. With pressure around 20PSI, the thermostat spring will be compressed and open and water should flow through.
If no water coming through either pee-hose or thermostat, you may have pieces of a broken impeller stuck up in the water tube. Off with the powerhead and clean out.
If ok, testrun in a drum of water, water level 1" above the split between gearhouse and leg. Do NOT use muffs to test waterpump function!
The pump function may even be tested with a power drill on the driveshaft and gearcase submerged with water just on top of pump housing. Remember clockwise rotation of driveshaft.

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

Ok hooked the hose up to the copper tube and water came out of the pee hole with no trouble at all. That must mean no clogged witch is real good for me.

 

[Haffiman]

Re: 1992 Johnson 25 HP Impeller

Then back to the pump and remove it.
Has the steel insert rotated in the housing?
Did you install the impeller and key properly?
Rotate the shaft clockwise when putting on the housing to be sure wings get the right way.

 

[Cofe]

Re: 1992 Johnson 25 HP Impeller

Here is a link to a diagram of your motor. http://www.boats.net/parts/search/BRP/JOHNSON/1992/J25TEEND/GEARCASE/parts.html

I only recommend using a water pump kit when repairing a water pump. Too many things can be wrong when a pump won't work. Besides getting a water pump to work, a person must consider that water can enter the gear case if gaskets, o-rings are bad on the water pump.
That said......the water needs to be half way up the leg as stated before, the area where the water pump is located must be submerged for a pump to work. Also take your time when aligning the water tube with the pump. The tube must be seated into the grommet in the pump.....another reason for purchasing a water pump kit. It comes with a new grommet for the water tube.
As far as vernathum......your motor doesn't have one.....

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

Then back to the pump and remove it.
Has the steel insert rotated in the housing?
Did you install the impeller and key properly?
Rotate the shaft clockwise when putting on the housing to be sure wings get the right way.

If the wings go the wrong way will it not work? i thought the suction would make them go the right way. and can the impeller go in upside down?

 

[Haffiman]

Re: 1992 Johnson 25 HP Impeller

If the wings go the wrong way will it not work? i thought the suction would make them go the right way. and can the impeller go in upside down?

They will normally turn right way even if installed 'wrong'.
If not mistaken that impeller has a wedge locking it.
Put the wedge on the shaft and put impeller on from top, it will only fit one way, and the impeller will center and lock on the wedge.
However I've seen cases where people obviously has pulled out the shaft,and installed the impeller from the bottom, not a good solution!
In this business, the most is possible!

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

the shaft comes out real easy is it supposed to do that?

 

[Haffiman]

Re: 1992 Johnson 25 HP Impeller

Yes, it is just a spline fit in the pinion, no nut holding it down.

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

Okay then I?m not worried about that. The housing has nothing noticeably wrong with it what should I look for?? All the seals look good

 

[wilde1j]

Re: 1992 Johnson 25 HP Impeller

If the wear plate or housing has any scoring, the pump won't work or won't work well.

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

I baught the repair kit today and will be installing is in a little bit. I will re post later to tell you how it went.

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

okay everything is done and working fine. i think the housens must have been bad. Thank you all for your help i couldnt have done it with out your inputs.

 

[Daviet]

Re: 1992 Johnson 25 HP Impeller

I'am glad you got your problem fixed.

 

[Borgey401]

Re: 1992 Johnson 25 HP Impeller

okay everything is done and working fine. i think the housens must have been bad. Thank you all for your help i couldnt have done it with out your inputs.

I am going to tackle my water pump this weekend. I plan on getting the whole kit and not just the impeller. Any tips on doing this Taylorsville?

 

[Taylorsville]

Re: 1992 Johnson 25 HP Impeller

the only thig i would say is make sure the copper tube gets in and i wish i would have gone the route out buying the whole kit at the start. The job its self was not that hard after i installed the whole kite. this whole tread helped out alot i think if you come to any hang ups you will find the answers in here for sure.

 

[Cofe]

Re: 1992 Johnson 25 HP Impeller

Good to see you got it going Taylorsville.
Just wanted to mention, that just because the motor has a good tell tale stream of water, does not mean that the motor is not overheating. The tell tale stream is just a indication that the water pump is working. If a thermostat is faulty, the motor would heat up and the tell tale stream would still be good. It is good to check the motor temp once in awhile by putting your hand on the head. You should be able to keep your hand there half way comfortably. Another way to check is to purchase a digital temperature gun. They are cheap and well worth it. The motor temperature should be around 145 degrees at operating temperature.
Another use for the digital temp gun is for grilling, or smoking food. But that is another subject.....