Lower unit bolts stuck

[Dan Dude]

I recently sucked a roller bearing into my mid piston on my '74 70hp jhsn. I just got a '73 65hp jhsn. the top runs good. Compression is 125,124,125 but I am a little conserned about the lower unit, water comes out the prop exhaust and i don't think i am getting enough water circulation with the flush attachment as i did on my '74 70hp. I want to swap the lower unit from the '74 70hp. but the 5/8 bolt and the 1/2" bolt on the trim tab won't turn on the '73 65hp. how can i get them off? so far I only used hand tool, should i try an air gun on it or will they snap?

 

[Joe Reeves]

Re: Lower unit bolts stuck

Water is supposed to flow out thru the propeller. Use a hand held propane torch (nothing hotter than that) to heat the aluminum on both sides of that bolt while applying pressure to remove it.

 

[scubaman67]

Re: Lower unit bolts stuck

take your time and be patient. propane worked for mine, except for the ones when I was impatient. drilling and retapping the broken bolt was a nightmare..

 

[Texasmark]

Re: Lower unit bolts stuck

Nothing works like an impact wrench on loosening a stuck bolt/nut. Just don't put it on high impact.....impact according to size of fastner.<br /><br />Additionally, a thorough pre soak with a premium penetrating oil (Kroil for one...or Deep Ceep) will also help.<br /><br />Fire works too, but you bake your paint. And if you put penetrating oil all over the thing before you cook it, you are in for a fire.....and then there is the problem of damage to other parts....doesn't seem to be an issue here due to the location of the problem....nothing else back there.<br /><br />But, I have used fire before also, when all else fails, as a last resort......repairing 50 year old ag equipment.<br /><br />Mark

 

[Dan Dude]

Re: Lower unit bolts stuck

Thanks for the advise wth the propane guys... It seems I don't have to worry about it. I learn something new every day. I dropped it in the water today and everything ran fine.. perhaps I was just being too cautious.. it really ran better than my 70hp