I will see if there is anything in my misc. repair manual that may help you out. i will respond later on with an answer to what i find.
[attachment=34301icture_...__Small_.jpg][attachment=34301
icture_...__Small_.jpg][attachment=34301
icture_...__Small_.jpg][/bhi alli have a 1981 everest 500 with the 503 motor, the nut on the fan backed off and everything inside the fan was lost, anyone got ant diagram that i could find what parts i need, than ks all