Dometic Model 511 china toilet

I am in the process of replacing the base unit of my 511 Sealand 511+ toilet. I read in some of the troubleshooting guides that a too loose clamp ring can cause water to not stay in bowl and a too tight can cause the flush ball to not close properly. I could most likely guess at the torque requrements but wondering if anyone knows how many inch pounds required to do the job correctly. I have searched my manuals but could not find anything listed. Thank you, Don.