John Deere engines Engine Plug size Link – Part# T20098– AG TRACTORS: 301-401, 820-830, 1020, 1070, 1520-1530, 2020-30, 2150, 2240-50, 2440, 2630-40, 6100, 6200, 6300, 6400, 6500 7/8″-20-UNF-T10 Show plug – Part# R26727– 359+, 404, 466, 619, 850, 955CID– AG TRACTORS: 3010-3020, 4000-4020, 4230-4240, 4430-4440, 4620-4630 1″-14-UNF-T12 Show plug – Part# T111565 M16x1.5-T10 Show plug – Part# M1746T, 359CID– AG TRACTORS: 2010, 2040, 2350-55, 2550-55, 2750-2955, 3050-3255, 4030 7/8″-14-UNF-T10 Show plug – Part# R27175, R84262 – 496CID, 4*50 & 4*55 SERIES– AG TRACTORS: 4755-4960, 7200, 7400, 7600, 7700-7710, 7800-7810, 8100-8420, 8430(new), 9100-9520 1 1/16″-12-UNF-T15 Show plug – 3029 (Oil Pan #1909), 4045 (Oil Pan #1944),6068 (Oil Pan #1944), 4022– Part# RE523251, RE46687, R515195– Part# R116102, RE500611, RE507950– 35G, 50G, 60G, 75G, 85G M22x1.5-T10 Show plug – Part# RE46685, R27474 M18X1.5-T14 Show plug – 4045( All, except oil pan # 1944), 6068 (All, except oil pan # 1944)– 160, 643L, 834J, 843K, 843L– PE4045T M18x1.5-T10 Show plug – With 855 or L10 Cummins 1″-18-UNS-T12 Show plug – AG TRACTORS: 7.310 M27x2.0-T12 Show plug – 7.6L(Oil pan # 1920) 3/4″-14-NPT-T10 Show plug – 100 Series– JD part # 15H623– PC9540 Tractor– 20 Engine GU20374– 105 Tractor 3/8″-18-NPT-T10 Show plug * If the engine you are looking for is not listed, please check Femco’s catalog or use the search engine on the homepage.