http://www.englanderstoves.com/manuals/PU-CBG_combustionblowergasket.pdf
its pretty simple, there are 5 screws (5/16) holding the blower to the stove , you will need to remove the side access panel and preferrably the rear one to gain as much room as you can to work,
first unplug the stove, then locate and unplug the wires to the exhaust / combustion blower from the control board , these will be the 2 wires in the row at th etop of the circuit board which are closest to the front ogf the unit. note there are 2 blank terminals to the right of these wires which are not used so pay attention of which terminals the wires are connected to so not to cause confusion when reinstalling. and snip the wire ties so that you can remove just the blower wires from the bundle
next disconnect the flue pipe ( take advantage of this time to clean out the flue as we already have to disconnect it) locate the 5 screws (look at the link above the picture shows the locations on the blower itself) 2 above , 2 below and one just under the exhaust coupler.
after removal for cleaning , use a putty knife or similar to scrape off any residual gasket material from th eold gasket which will pretty much fall apart when you take the blower out. use a medium stiff brush to clean the impellor and inside of the housing (an old toothbrush works pretty well on the blades) once clean i have a little tip for ya. pick up some spray graphite from your local hardware or farm service store. "paint" the impeller and even the inside of the cleaned housing with this graphite it actually helps keep the crud from burning from sticking to the surfaces especially on the impeller and its not flammable(BTW its good for squeaking augers as well) while the blower is off , clean out the exhaust housing from which you removed the blower as it is an area which if neglected can contain quite a bit of ash buildup.
once the cleaning is completed and graphite has had about 15 minutes to dry onto the housing and blades regasket the blower and you are ready to reinstall it. the gasket can be put in dry but you may find some sort of adhesive will make it easier to keep it in place during the installation, just a couple dots of pretty much any adhesive should be ok, we use a spray adhesive at the plant with no issues, silicone, elmers glue , whatever's handy.
reinstallation is simply the reverse of removal, another hint , start all 5 screws before tightening them , makes it easier to get them all in.
after reinstalling and reconnecting wires to the board , zip tie your wire bundle back together taking care to keep the bundle and loose wires away from hopt surfaces and moving parts. when all is reassembled and the flue is hooked up, perform a quick "dry run" without lighting for long enough to ensure all our parts are operating normally (just in case a wire came loose or somthing) when satisfied all is ready , put the unit back into service.
hope this helps ya