Chainsaw Repair

Hey,I have a 385xp that somehow spun the bearing on the crank,the case is still "tighter than bark to a tree".Gonna replace the bearings anyhow,so was wondering if anyone has had success with 680 or 660 loctite in such a situation? the crank is .001 under the bearing. id.
Another builder has told me he has done so on an Alky saw,so what do you think ?

Steve

I haven't even run this saw,got it as a fixer upper so as I was tearing it down the crank "fell" out  so on further inspection found it.Adam C. told me he had success with a 7900 Alky burner with the same problem,says it is still running fine. So I'm going to try it with 680 loctite.
Looks like you have a similar situation.

Steve

I showed Al the 372 bare crankcases I have that  would create a air leak when  both ceramic bearings had spun when the saw would warm up under 3 cuts.  5ci alky saw. I just gave the builder another crankcase  to use.

But like Al and others said they said it was still usable if one of the above ways are used.

Joey mine was outer race to crankcase. Good idea on the sleeve for a different problem. I had to do that on some small block 60's chevy's in the past.

Steve, I blanked off the carb and exhaust ports with a piece of rubber. Rigged up a hose with my vacuum for air condition on a car, had a guage teed in place and adjusted air regulator so guage was showing 7 inches of vacuum. Pulling a constant vacuum on crankcase.
Worked out to about 40 psi and used brake cleaner around the crank to bearing fit. You could see it pull the brake clean in. I let it air dry. I used a loctite bearing retainger compound, dont remember the number,  it was blue,and it pulled in place. The trouble I had was the loctite setting up. It would move so I was flipping the case while it was setting up. Well, IT DID NOT WORK, but it was worth a try. I still might yet try again, because it was only time envolved. The loctite 660 is thicker and I didnt think it would pull in. I will have to check out the 680.

I doubt seriously if you would get enough contact surface area only attempting to force sealant around the edges of a bearing especialy with blue loctite .

Blue doesn't set up nearly as hard as red .It's used more for Welch plugs and things of the that nature .As a matter of fact blue is almost a thing of the past on modern auto engine which are mostly aluminum .Any loctite used on these now of days is red .