Here's a link to a step by step procedure for taking our rifles apart, not quite YOUR rifle by it will do nicely. Since Marlin have changed only slightly over the years things may be a bit different in the 36.
http://www.marlinowners.com/forums/index.php/topic,26786.0.html
I suggest a good cleaning if you haven't already done so, a thin coat of oil on moving parts a dab of grease on sliding parts. Pay close attention to any parts you remove, check them for rubbing (wear) as to the grating sound??? grit in the sear engagement area? Hope this helps some. By the way Walter..........Welcome to MarlinOwners! ;D I'm pretty sure others will chime in soon. Mr fixit
http://www.marlinowners.com/forums/index.php/topic,26786.0.html
I suggest a good cleaning if you haven't already done so, a thin coat of oil on moving parts a dab of grease on sliding parts. Pay close attention to any parts you remove, check them for rubbing (wear) as to the grating sound??? grit in the sear engagement area? Hope this helps some. By the way Walter..........Welcome to MarlinOwners! ;D I'm pretty sure others will chime in soon. Mr fixit