1975 70 hp johnson water leak exaust side

[jamesijb]

I have a 1975 70 hp johnson and a few weeks ago it locked up on me.The problem was water leaking in the exhaust port and that locked up the motor.I changed the gasket which was a pretty big job.I took all the precautions like sand paper and glass to get the surface true and proper torque.The new gaskets held for about four trips to the lake or 18 gallons of gas.Now the gasket faild where water shoots out near the ground cable bolt.It looks like the gasket was forced out.I used a thin coat of rtv sealant when
I put it together (wondering if this was my fatal error?).I would like to know if anyone could give me some pointers before I do the gasket replacement this time.Any and all help would be greatly appreciated.

 

[reeldutch]

Re: 1975 70 hp johnson water leak exaust side

if im not mistaken you have more than 1 gasket to replace. i do believe 3. to do the job correct.
pretty shure about it.
you want to use gasket sealing compound.
that should do the job.
you might want to take the ph of to get all the exhaust cover bolts out.

 

[jamesijb]

Re: 1975 70 hp johnson water leak exaust side

I did replace all three gaskets it was the inside one that failed first after i replaced it was the furthest one to the outside that faild. I will try the dressing this time and not the rtv. thanks I'll get to it next weekend and will take any pointers you can think of. (I don't understand ph to get all the bolts out)

 

[jamesijb]

Re: 1975 70 hp johnson water leak exaust side

I now get ph (power head) thats how i did it the first time.
sorry but the computer is not my strong point.Thanks for your help.I'm hopeing the gasket sealer will do it for me this time.