You don't mention what part of the disconnector broke.
The purpose of the disconnector is to disconnect the trigger from the sear so that the action will recock when it cycles. If it doesn't recock, the bolt could close with the firing pin protruding from the bolt face. This could result in a jam, an out-of-battery discharge, or full auto fire. Given how the feed system of the Model 66 works, the latter is a possibility.
Try this: #### the rifle and dry fire it, keeping the trigger pressed back. Pull the cocking handle back and release it. Release the trigger. Pull the trigger again. Does the firing pin fall?
Using the rifle with a broken disconnector - or any broken part - is unwise and is asking for trouble. Get a replacement part and make sure it is installed correctly.