Posted: Sun Oct 23, 2011 2:59 am
Putting new Timbo worked parts in an engine I picked up that seemed to have a monkey build. When I removed the scavenge pump I noticed loose bolts. Wasn't ridden after built a few years ago or I'm sure would've grenaded. I got the new crank in and everything good till the scavenge pump. I noticed that the first two pins were damaged and wedged in there, the inner rotor had a bad burr, and the pump cover bottom left bolt housing was cracked.
I put in all new parts, o-rings, cover, and all seemed good. Spins freely as manual says up until finger tight. But as soon as I torque the bolts to manual specification it is impossible to spin; completely locked. I even swapped out covers again to try with same result. It seems the cover pushes down on the rotors, freezing them in place. The washer is in the cover also.
The only thing left I can think of is the cartridge plate being bent maybe. As said, the bolts were not torqued down when opened up. The cover had a small gap in it because of that. Any suggestions here? I can try another plate, just haven't yet. And wondering if I'm overlooking something simple. The last two I put together went without a hitch.
Also, I need two scavenge pump covers, both the inner pins on the shaft, and the inner rotor if anyone has some they want to get rid of cheap.
Edit: I can only torque down the top cartridge bolt. The other bolts for the pump cover wont go to the specifications. I cracked another pump cover torquing them down.
I put in all new parts, o-rings, cover, and all seemed good. Spins freely as manual says up until finger tight. But as soon as I torque the bolts to manual specification it is impossible to spin; completely locked. I even swapped out covers again to try with same result. It seems the cover pushes down on the rotors, freezing them in place. The washer is in the cover also.
The only thing left I can think of is the cartridge plate being bent maybe. As said, the bolts were not torqued down when opened up. The cover had a small gap in it because of that. Any suggestions here? I can try another plate, just haven't yet. And wondering if I'm overlooking something simple. The last two I put together went without a hitch.
Also, I need two scavenge pump covers, both the inner pins on the shaft, and the inner rotor if anyone has some they want to get rid of cheap.
Edit: I can only torque down the top cartridge bolt. The other bolts for the pump cover wont go to the specifications. I cracked another pump cover torquing them down.