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To install a new crankshaft front oil seal, loosen the alternator to slacken the drive belt. Remove the belt along with radiator if these items block access to the seal. If the car has a manual transmission, set it on first or reverse, and raise the handbrake to its tig...


To seal an oil leak, first identify the leaking part. Spray an engine degreaser on the engine dirty parts to clean it. Rinse the engine with clean water, and give it enough time to dry. A clean engine should be a good guide in locating a secondary leak, apart from the o...


Creatures that eat seals include killer whales, humans, polar bears and other seals. The Weddell seal, which is found in the Antarctic, is prey for killer whales, also called orcas, and leopard seals. Leopard seals also eat crabeater seals. Leopard seals, in turn, are p...


The National Oil Seal Interchange is a method or chart that enables a user to match an oil seal made by National Seals with an equivalent or substitute made by another company. It is a method of matching one manufacturer’s part with that of another manufacturer.


Common shaft sizes for oil seals range from 0.110 inches to 79.530 inches for electric motors, drives and gearboxes, and from 0.180 inches to 8.270 inches for automotive and agricultural applications. Shaft sizes of more than 78 inches are typical for paper or metal mil...


The National Oil Seal company is now part of the Timken Company. The Timken Company continues making oil seals under the National name, and it has a team of manufacturers and engineers that design each seal.


A typical oil seal has a shaft diameter of 0.25 inch, an outer diameter of 0.75 inch, and a width of 0.25 inch. Another type of oil seal has a shaft diameter of 0.437 inch, an outer diameter of 0.624 inch and a width of 0.125 inch.