'94, 40 hp Johnson crank

[haz]

Well, I'll keep the back ground short<br /><br />I got a motor that came in 3 buckets. The fella said a nut or a bolt went through one of the cylinders. Looks to me that the connecting rod bearings went, spit the rollers through the transfers and then continued to smack the rollers between the head and the piston. So you can imagine what I'm looking at here. The thing that's got me most worried is the journal on the crank. I've never had to deal with this kind of repair before and I'm trying to figure out what my options are. Is there a repair that can be made to the journal or am I in for a new/rebuilt crank? I think I can get away with some cylinder head machining and piston replacement for the rest of it.

 

[alcan]

Re: '94, 40 hp Johnson crank

Hi haz<br />Basicly you bought three buckets of parts. Usually if the cranck is gone on a motor that size and age it is time to throw in the towl. You will need another head, if those bearings beat into it. The metal pounded into it will cause hot spots (glow plugs) and lead to preignition, which will put you back where you are now. You will need to at least punch both holes and maybe sleeve one, if not both. The crank can be metalized an reground. We're talkin alot of bucks here for a 40hp. Unless you have some freinds that owe you or you have the mechinery to do this work yourself, I would suggest looking into a reman powerhead.

 

[haz]

Re: '94, 40 hp Johnson crank

I'd like to try and shave the head to fix up the damaged portion of the "squish band". Does anyone know how much I can get away with here? I don't believe these stock motors live on the edge wrt compression so I thought I'd have some room to increase the comp a bit. I'm guessing I may have to take off as much as 0.060".