This is a A-3637401M91 Crankshaft PN: 3637401M91Main Description As Following : A-3637401M91 Crankshaft P.N: 3637401M91 This is a late 3 bolt nose crankshaft. If replacing single bolt style order thrust block & bolt packSplined Nose- 3 Bolt, Lip SealFrom Eng S/N U136319L >, 500 Amp Lincoln Electric WelderReplaces: 3641825M91 Replaces: U5BG0009 PERKINS ENGINE PARTS , U5BG0019 PERKINS ENGINE PARTS , U5BG0022 PERKINS ENGINE PARTS , U5BG0024 PERKINS ENGINE PARTS , U5BG0052 PERKINS ENGINE PARTS , VPC1006 MISCELLANEOUS , VPC1011 RENAULT , VPC1018 VAPORMATIC , ZZ90079 PERKINS ENGINE PARTS , A-ZZ90081 PERKINS ENGINE PARTS , A-ZZ90082 PERKINS ENGINE PARTS , 02100012 JCB , 02101372 JCB , 02101825 JCB , 02101835 JCB , 31315631 MASSEY FERGUSON , 3637401M1 MASSEY FERGUSON , 3637401R91 MASSEY FERGUSON , 3637402M91 MASSEY FERGUSON , 3637402R91 MASSEY FERGUSON Found in Section & Models : Tractor Parts Associated Items : New Also This is An Aftermarket Product And : This is a late 3 bolt nose crankshaft. If replacing single bolt style order thrust block & bolt pack Splined Nose- 3 Bolt, Lip Seal From Eng S/N U136319L >, 500 Amp Lincoln Electric Welder Replaces: 3641825M91