Vivian C Elk Rapids , MI March 30, 2015 Appliance: Tappan Gas Range TGF317BWA Tappan Range Tgf317bwa: Oven bottom had a rusted hole grease dripped into it and oven caught on fire!. How to replace Bottom-Gas Oven. I ordered a new oven bottom ($65 instead of new stove). I put it off, anticipating that it wouldn't be as simple as it sounded. When I finally put the new one in, it literally took 4 minutes!! Remove the two screws in the back, old one slid out, new one slid in. Simple. 7 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes