The rear main seal keeps oil sealed inside the rear of the engine, where the crankshaft connects with the transmission. … An oil leak from the main seal, also known as the rear crankshaft seal, will usually drip from where the transmission connects to the engine, though it may show up elsewhere, such as on the oil pan.
The axle shaft seal exists to prevent fluid from leaking out of the differential or transaxle. It also prevents contaminants from getting in. … On a front wheel drive vehicle, the axle seal is at the inboard end of the axle where it goes into the transaxle.
O-rings are probably the most common fluid power seals. … O-rings seal by mechanical deformation that creates a barrier to a fluid’s potential leak path between two closely mated surfaces. O-rings are typically installed in a groove that’s machined or molded in one of the surfaces to be sealed.
How to fix a valve cover gasket leak. If you find evidence of a leak, the best solution is to use BlueDevil Oil Stop Leak. Adding 8oz. of BlueDevil oil stop leak to your engine oil is guaranteed to permanently seal any oil leaks in your vehicle’s engine.
When you have a bad valve seal, the oil that collects at the front cover of the head will end up burning when you push on the accelerator after coasting for a while. This is apparent especially when going downhill and again will be indicated by the excessive smoke that leaves the tailpipe.