QJ1E40QMB-4 Long Case Final Gearbox Gear Binding

[islandscrub]

Aloha!

    I picked up a new engine block and had the crank redone at a shop (Ruima, stock stroke). I started on the final drive box today, the cover and innards of which I had to pull from my regular 1E40QMB with the blown cylinder studs. It seems to match up perfectly, except if I torque down the bolts, the gears bind up and stop spinning easily. If I back off the bolts just a bit it seems to spin freely again, is there a gasket for the back gear box that I'm missing? Any links to such a gasket would be much appreciated!

mahalo!

[190mech]

Brent has a printable pdf of one here;
49ccscoot.proboards.com/thread/1516/gearbox-final-drive-transmission-gasket

Many vendors have them,PFS does..

[90GTVert]

Sometimes you can remove the shim that goes on the intermediate gear and use a sealant instead of a gasket and that will work. Don't lose that shim though, it may be needed again someday. Before you go putting on sealant, do a dry run and see if that works and allows everything to move freely. As is par for the course with Chinese parts, sometimes that will work and sometimes it won't.

[islandscrub]

Thanks for the replies!

I was doing a little thinking in the hours before I went to bed and thought about the necessity of that shim, it's good to know I can take it out safely, it would save me some scouting around for a gasket (or cutting one, ew). I noticed my shim seems to be a little springy, more like a wave lock washer than a flat one, might be contributing to the binding moreso. Unfortunately I did'nt do the dry fit before I threw on some motoseal, so I have to do some scraping, but at least it wasnt fully dry before I discovered the problem.

[islandscrub]

I ended up cutting a new 1/32" thick gasket with the template, came out great! Hopefully it will stop the binding and hold in oil.