1978 115 hp johnson

[KYHunter]

Hi, I posted a few months ago about the boat I bought a '78 procraft with a 115 hp johnson. Well its been running great until today I was coming in and lost alot of power and motor has a sound like a light grinding sound in power head . I shut it down right away and luckily was towed in. The guy who towed me said it sounds like broken rings. I know my description of the sound is not a big help. I was just wanting to know if what the guy said sounds correct and what it involves to fix if it is rings. I was told the motor was rebuilt recent to my purchase. The gaskets on power head all look new and I thought maybe the rings were not installed right . The starter about fell off one day the bolts came loose so nothing would be a surprise. Also would I be better off with a rebuilt power head or what is the best thing to do and what kind of money is involved.<br /> Thank you,<br /> KYHunter

 

[moderator1]

Re: 1978 115 hp johnson

How much time do you have on it since it was rebuilt?

 

[KYHunter]

Re: 1978 115 hp johnson

I really don't know the person I bought it from got it on a trade from someone . He told me he took it to a dealer for a inspection and was told it looked like it was rebuilt. I've put at least 40 or so hours of actual run time on it myself. I run seafoam in gas and had no indication of a problem until last night. Any help greatly appreciated.

 

[walleyehed]

Re: 1978 115 hp johnson

First, let's do a compression test and see what we have....I have a feeling we will find something there.

 

[KYHunter]

Re: 1978 115 hp johnson

I did compression check it led to taking power head off found piston with broken ring and badly cracked crankshaft almost broke in two also a hole in crankcase but this was not caused by this incident it has been like that for a while. Can I just replace the one bad piston and try to get a crankshaft? The cylinders and other pistons are all in good condition,the one where the bad piston was is very lightly scratched. Can I hone the cylinder and is it possible to repair the crankcase or do I need to try to get that as well. I recall something about having to get a block and crankcase together . I am on disability and can't afford a rebuilt power head or for that matter a new block and crankcase. What are my options?<br /> Thanks everyone for any suggestions!<br /> KYHunter

 

[fireman_103]

Re: 1978 115 hp johnson

I have a crank shaft that i can sell ya. fireman_103@yahoo.com