35 johnson overheated

[wideide]

I was trolled around for a couple hours than went to the fast side of the lake after about 6 minutes of full throtle it started to slow down I emedeitly cut gas put in nutral and it died steam was coming out of the water drain I pulled the cover off looked like steam was coming from head gasket too. tryed to pull cord the moter was locked up.threw my anker in than tryed the pull start again it moved and pumped water let moter cool a little than tryed too start it stated for about a minute than died. after being towed to ramp I put it on the trailer and noticed watery oil coming from top end of the lower unit could this be related or something else ether way I have to fix it. the impeller was replaced last year I would like a good check list for moning.
thanks for looking

 

[wideide]

Re: 35 johnson overheated

did a conpreshon test this morning not good top cilinder is 90 bottom is 120 last time I checked they were both 110 going to start takeing apart and see what else I need before going to outboard store for parts. is the thermastat under the plate that has pee hole?

 

[rolmops]

Re: 35 johnson overheated

Do check your thermostat, your impeller and all the cooling line connections and grommets.Make sure everything is working well, clean and no place where water can escape the system.
As for you compression,don't panic (just yet).By what you write about steam coming from your head gasket,it may very well be the reason for the difference in compression.
Take the head off and check the gasket and while you are at it see if your cylinder is (badly) scoured.Gut feeling tells me that it is not.Maybe all it needs is to be honed a bit
Replace the head gasket and check your compression again, and let us know what you find

 

[crxess]

Re: 35 johnson overheated

Pull the head plate and inspect/replace the gasket. Make sure the head is true(flat).
What year is motor? Thermostat is normally in the head. Some have a cover. Some require removing the head plate to reach.

 

[wideide]

Re: 35 johnson overheated

the top cilinder has some scorring doesnt feel to bad but im concernd the bottom cilinder is nice and smooth no scorring at all thinking I need to rebuild how much scorring is to much? theres two ridges within two inches of eachother not too big but feelable

 

[rolmops]

Re: 35 johnson overheated

the top cilinder has some scorring doesnt feel to bad but im concernd the bottom cilinder is nice and smooth no scorring at all thinking I need to rebuild how much scorring is to much?

"some scoring" can mean a lot of different things for different engines.
If you can, post some pictures along with the model# of your engine.That would help a lot at this point.

 

[wideide]

Re: 35 johnson overheated

my camera wont work so heres to modle 76 johnson 35r76g

 

[wideide]

Re: 35 johnson overheated

just got done taring apart lower end the last guy to work on this motor realy didnt know what he was doing there was no seal for the lower end thats why water got in he didnt klean out under the impeller put form-a-gasket over remnents of old gasket then put gasket found same thing when I did the intake and leaf plate gaskets. think Im going to rebuild whole thing to make sure it all done write.