Parts for Caterpillar 3406B - Oil Section Loading... 1 Oil Pump for Caterpillar 3406, 3406B and 3406E engines For engines with serial prefix numbers: 91U, 6TB, 9WR Price: $ 524.88 Qty: ^ Pictures In Stock Add to Cart 2 Oil Cooler core for Caterpillar 3406 and 3408 engines Oil Cooler core. Price: $ 849.54 Qty: ^ Pictures In Stock Add to Cart 3 Oil Pump Repair Kit for Caterpillar 3406B and 3406E engines . Price: $ 415.22 Qty: ^ Details In Stock Add to Cart 4 Oil Pan Gasket for Caterpillar 3406 engines . Price: $ 30.80 Qty: ^ Details In Stock Add to Cart 5 Seal-O-Ring for Oil Cooler, Caterpillar 3406,3408, 3412 One per oil cooler Price: $ 7.48 Qty: ^ Details In Stock Add to Cart