Motor Rebuild

[msf171]

I am rebuilding a Johnson Motor, would appreciate suggestions on the following questions.<br /><br />The aluminum block has a heavy build-up of carbon and varnish, what is the best solution to soak it in?<br /><br />When I reassemble the needle bearings in the rod/crankshaft connection, what is the best lubricant to hold them in place?<br /><br />Thanks!<br />Mark

 

[Walter]

Re: Motor Rebuild

I'd think an all purpose petroleum based solvent like Chevron #370 work well...especially if you could emmerse the block and soak it for a period of time. Remember though...some solvents are not aluminum friendly, so no matter what...be certain whatever you use won't damage your block. As for a lube to hold your needle bearings in place? My suggestion is to use petroleum jelly..aka Vasoline. It will quickly liquify after the engine begins to warm up and disperse with the fuel/oil mix.<br /><br />Good luck...<br /><br />Walt

 

[manowar]

Re: Motor Rebuild

white lithum grease is ok for rebuild grease the other guys right about the cleaning fluids for aluminum soon as you think youve cleaned everything chek it again thet computer duster compressed stuf gets hard to reach spots have a nice rebuild

 

[markdraper]

Re: Motor Rebuild

I am thinking about trying to rebuild a 115 hp Johnson outboard that has had the head off and been out in the weather for a couple of years, extremely rusted. I don't have any sophisticated hand tools, etc. and am not experienced in such a thing. Is this nuts?

 

[Walter]

Re: Motor Rebuild

I dunno Mark...there are a lot of running used motors out there for sale at a decent price. You might wanna consider other options. New (even used) parts are not cheap...and properly rebuilding a V-4 takes considerable mechanical apptitude AND the proper tools. Personally, I wouldn't tackle it. If you decide to, there are a lot of folks in here willing to help out, but advice will only carry you so far.<br /><br />Walt