Crankshaft Seal : Referred to as a front crankshaft seal, rear crankshaft seal, front seal or a rear main seal, the crankshaft seal seals the front or the rear of a crankshaft on your automobile’s engine. A typical crankshaft seal is a rubberized metal press-in style seal. Some of the earlier crankshaft seals had a rope seal or a split rubber seal. The seal rubs against the crankshaft with a lip surface and the pressure of the engine or a round spring help keep the oil lip tight against the crankshaft sealing the crankshaft and preventing engine oil from leaking.
There are times you may have a crankshaft seal leak and they must be replaced to stop the leak. Other times, a crankshaft seal is simply replaced as a precaution as part of another repair job such as a harmonic balancer, clutch or timing belt job.
For a crankshaft seal to work, the seal housing must be in good condition to hold the seal and the sealing surface or the crankshaft or harmonic balancer must also be in good condition. These surfaces are perfect round surfaces and have a polished finish. In some instances, a timing cover, rear seal cover, engine block, harmonic balancer or a crankshaft may have to be replaced just for a crankshaft seal problem. There are a few known issues in which a speedy repair sleeve can be used to quickly create a good surface for a harmonic balancer or a crankshaft sealing surface. If you have a crankshaft seal leak, visit Guy’s Automotive for a speedy repair.