Help on almost overheating

[draft raft]

Hi, I have a 1999 four winns with a V4 115 Hp Johnson outboard. I had the water pump replaced with the impeller,(not last summer, but the one before), and everything was good. I have small canal I have to go down to get to the lake(it's maybe 200 yards long), and in that 200 yards the engine temp gauge climbs to almost 220(which is the highest setting), and just before If it gets there, and I get to open water and take off, it immediately drops to about 125-130(where it should be) I've check the pee hole, because It's not a strong stream coming out,like it was with the new pump and impeller.It is not blocked. I then check the intake screens, and there is no debris.So 2 questions, 1) does this motor have themostats, and if so where are they located, and 2) is there some other thing that can be clogged either in the outdrive, or up inside the engine that I'm not aware of? please help, as I really don't have the money for a new impeller and pump. I appreciate any help anyone can give, and thank you in advance.

 

[QC]

Re: Help

Re: Help

Moved this over to the JohnnyRude section. You'll get quicker help here. Good luck!

 

[bustermin]

Re: Help

Re: Help

is there a lot of vegitation in the canal, and then it clears up when you get into open water?

 

[draft raft]

Re: Help

Re: Help

Hi Bustermin, thanks for replying....there is a bunch of crap in the canal.It has a bunch of old tree stumps,(it's a lake thats been there since the late 60's, but it used to be an old wooded area that they havested the trees, and then flooded it, but it's size is about 250 acres),muk and silt,and something that looks like pollen floating on the top...not alge, but that is something new this year...I think it's from the trees above?? So is there thermostats that might have gotten clogged? or anything else?? thanks

 

[draft raft]

Re: Help

Re: Help

Thanks QC I'll try it, you said jonnyrude?? Is that the forum of Johnson, and evinrude? i'll post one there? Thank you

 

[QC]

Re: Help

Re: Help

I already moved it, this is there now . . .

 

[draft raft]

Help on almost overheating

Hi, I have a 1999 four winns boat with a V4 115 horse Johnson outboard, with very few hours on it. My problem is that I had a new waterpump,and Impeller put in a couple of years ago, and (what I called it)pee'd a strong steady stream. Now it is weak, but still somewhat steady.My boat is kept in a canal about 200-250 yards from the lake.WhenII start it, and drive the 200-250 yards, before i can take off, the temp gauge rises to the 220 degree mark(the highest on the gauge) and if I take off, it goes right back down to the normal operating range of 120-130.I know when taking off an maintaining a constant plane that I'm pushing more water through it, so it drops because it's being cooled.So any suggestions on what to do? I have checked the pee hole, and it is clear(I even ran an extremely small piece of wire up it, to see if it was block, and it was not). I then checked the intake screens, and they are both clean. So does this motor have thermostats, and if so where are they? It has to be something like the thermostats being pluged, or bad, because like I said when I do take off, it drops right down to where it should be! Any advise would be appreciated. thank you in advance.

 

[iwombat]

Re: Help on almost overheating

After a couple of years, it's time to put in a new impeller.

 

[draft raft]

Re: Help

Re: Help

Hi Qc, I didn't know YOU were going to move it, so I went to the Johnson and evinrude section and re-wrote it, so I guess there is two posts about it now. thank you D.Raft

 

[draft raft]

Re: Help on almost overheating

Hi iwombat, do they normally go bad every 2 years? the first on lasted 8years! When I saw the old one 2 years ago, all of the fins were permanently curved over, but was still scraping the sides of the cup(housing), that it rides in. I had it done, is it easy to get at?, they said to do it last time, they had to pulled the lower end unit, and disconnect, linkage to thorttle, etc... is that true? it sound difficult.Thanks for the advise.

 

[iwombat]

Re: Help on almost overheating

Depending on how often you use it, you can expect to get maybe 4 good years out of one. I replace mine every other year. Something you really don't want going bad on you. Sounds like yours is ready to be replaced. It's a pretty easy job with a manual. Get an OEM manual for your particular motor here and do the repair yourself. You'll end up paying about 1/2 and now you've got a manual for your next job.

 

[QC]

Re: Help

Re: Help

Hi Qc, I didn't know YOU were going to move it, so I went to the Johnson and evinrude section and re-wrote it, so I guess there is two posts about it now. thank you D.Raft

OK, now they're merged . . .

 

[npd4432]

Re: Help on almost overheating

I have a 2000 Four Winns Horizon 17 with a Johnson 90 on it and I had the same problem you did last year at the end of the season. My temp gauge would do the same thing and I once or twice got the hot alarm. During the winter I replaced my impeller and housing, and the thermostats. All went well taking the lower end off and replacing the impeller, the thermostats are a piece of cake. The only trouble I ran into was when I put the lower unit back on the motor it was pretty tough getting the shift rod lined up with the linkage. But once it was back together I used a lazer thermometer at the top of the head and all was well after running it for some time. The thermostats are 143* in there so they should open around there. My motor will also get up in the temp range at idle and when given some throttle it goes right down where it should be now with the replaced parts.

I also found out the temp gauge on the motor is off by about 5-10* when measured with the lazer.

 

[iwombat]

Re: Help on almost overheating

At high RPMs the poppet valves open and the t-stat is bypassed. So, it could very well be that your t-stats are not functioning properly. But, the weak tell-tale stream says that your impeller isn't pumping properly. You could be due for both.

 

[bustermin]

Re: Help on almost overheating

i misunderstood what you were saying, i thought you were saying the tell tale stream was weak when you were in the canal and got better when you got in open water which was the same time the temp would come down, which is why i was asking if there was a lot of vegitation. i would have to agree now that your problem is most likely the impeller, and if your going to take the time to change the impeller there is no sense in NOT changing the T-stat. as they are both part of the cooling system.