RICHARDSON ENGINEERING AND MACHINING

Information
This cross-reference chart is used for 18mm and 7/8" adapters. Use it as a guide only. There are many more plugs to choose from, these are the more common ones.

 This chart is used for the 1/2" npt, 3/4" npt, and Allison adapters. These plugs are "extended reach" to better position the 14 mm plug to the correct depth in the cylinder. The plugs in the above chart will also work; they are just a little shorter. 

REFERENCE FITTING CHART
TRACTOR APPLICATION GUIDE
 
Tractors that require 7/8" Flat Seat x 14mm Tapered Seat Adapters
 
CASE       Series C, D, L, LA, R
 
CATERPILLAR         All tractors thru 1930, All tractors using gasoline fuel; gasoline starting engine.
                               For diesel tractors 30, 40, 50, 60, 65, 70, 75, RD-6, RD-7
 
COCKCHUTT           80HC, 99, 80HD, 90
 
INTERNATIONAL HARVESTOR  Farmall 10-20,15-30,22-36, Std. Farmall. 20 Ind., 30 Ind., 15-30 Ind., I-12, I-14, I-30, F-12, F-14, F-20, F-30, I-40, IA-40, IK-40, Q-12, Q-14, W-12, W-14, W-30, W-40, WA-40. Fairway 12, I-9, W-9, WR-9, WR-9S, 20TTT, 10-20TTT, T-20, T-35, T-40, TA-40, T-9, T-14
 
JOHN DEERE        A, AR-AO, B, BR-BO, D, G, L series, (1931 and newer GP)
*John Deere tractors (A, AR-AO, B, BR-BO, G) built before 1940 will generally require a 7/8" adapter, these same tractors built 1940 and newer will generally require an 18mm adapter.
 
OLIVER  18-28, 28-44, 80, 90, 99 (4 cyl), 80KD, 90KD, 900, 80HC, 99HC, 35, 40, 40-30,                                 55, 80, BG, BGS, OC-3, OC-4, OC-12
       
MINNEAPOLIS MOLINE      U
 
Misc.                    1937 Silver King Hercules Engine
 
Note on all JOHN DEERE tractors: Generally, tractors built 1940-1970 will take an 18mm adapter, tractors built between 1925-1939 will take 7/8" adapters. One exception to this rule is the JOHN DEERE "D" which never took an 18mm.
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Tractors that require 18mm Flat Seat x 14mm Tapered Seat Adapters
 
 
CASE       OC, D series, LA series, 430, 431, 435, 440, 441, 445, 470, 530, 531, 535,                                      540, 541, 545, 570, 610, 730, 731, 732, 733, 734, 740, 741, 742, 743, 744,                                      770, 830, 831, 832, 833, 840, 841, 842, 843, 870, 910, 930, 970
 
FERGUSON             MH-50, F-40, MF-50, MF-65, MF-85, MF-88, TO-20, TO-30, TO-35 
                                 
INTERNATIONAL HARVESTOR Farmall (Reg. Super, & HC)  & Int. Utl. Series A, A-1, AV, AV-1, B, BN, C, H, HV, M, M-TA, M-TAV, MV, O-4, OS-4, O-6, OS-6, W-4, W-6, W6-TA, 100, 130, 140, 200, 230, 240, 300, 330, 340, T340, 350, 400, 404, 424, 450, 454, 460, 504, 544, 560, W560, 574, 606, 656, 660, 706, 756, 806, 856, 2404, 2424, 2444, 2500, 2856, 3514, 3616, 3800, 3850,  Cub, Cub Lo-Boy, T-6
 
JOHN DEERE           A, AR-AO, B, G, H, 50, 60, 70, 520, 530, 620, 630, 720, 730, 3010, 3020,                                        4000, 4010, 4020, 4030, 4230, 2520
                          
OLIVER     HC Mdls., Super 44, Super 55, 60, 66, Super 66, 70, 77, Super 77, 88, Super                                   88, 99, Super 99, 166, 177, 188, 199, 440, 550, 660, 770, 880, 950, 60KD,                                       66KD, 70KD, 77KD, 88KD, 1550, 1555, OC-6, AG-6
       
MINNEAPOLIS MOLINE      M5, M504, M602, U302, G704, G705, M604, M670, G900, G950,                                                    G1000, G1050, Jet Star Series, G, U, Z, 335, 445, 2-4-5 Star Crawler       
 
MASSEY FERGUSON       Several different engines used, MUST SPECIFY SPARKPLUG SIZE!       
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Tractors that require 1/2" NPT x 14mm Tapered Seat Adapters
 
JOHN DEERE       1930 and older GP.  1928 JOHN DEERE "D"
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Tractors that require 3/4" NPT x 14mm Tapered Seat Adapters
 
INTERNATIONAL      Titan
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