Put leak detector dye in to engine oil,depends on how bad it leaks,run for a while then see with a UV light to know before take it apart.If leaks at rear main seal,when changing it,should remove the rear main bearing cap also,put silicon where the mating surface,also at corners of oil pan to main bearing caps.Rear main seal and oil pan gasket replaced, still leaking oil.?
Where is it leaking oil? Get some engine degreaser and spray it on while engine warm, then spray it off with water so you can see exactly where its coming from, sometimes the leak will not even be close to where the oil drips, it can travel from one side of the engine to the other, was the transmission removed to replace the rear main seal? Was sealant applied to the corners of the oil pan gasket when installed? If it is the rear main the oil should dripping from the transmission housing. I have seen a sensor on the side of the engine leak and travel down the side of the engine along the lip of the oil pan and look like it was coming from there, so clean your engine well, drive it a few miles then look closely with a flashlight all over the engine.
Engine size would be a BIG help dude. It could be a number of places unfortunatly for you. Valve covers is usualy a good place to start. If it is a V-8 it could be out of the back of the intake manifold. There is suposed to be a gasket or gasket material that runs along the back of the block between the lower block and the intake maniflod. The small block Chevy use to be notrious for developing a leak here, some of the 302 Fords too. The seal simply shrinks and get hard with old age and starts to leak. If you have the straight six in it I would look more towards the valve cover or side cover leaking. Look at the PVC hose too, especially if it is ruff running. It would indicate a hose that is broken and then would allow the crankcase oil that is supose to be going back into the engine to get sucked out the hose.
sounds like the seal was,nt put in right. if it was the rubber seal then the lip on the seal should point towards the front of the engine and you need to put a dab of high temperature silicone sealer on both ends of the bearing cap before installing the bearing cap. also if they did,nt oil the seal up before installing it then the first time you crank the engine it will scar the seal and it will start leaking.
Give us a hint?
Make, model and year for starters. Where it seems to be leaking would also help.
The crank shaft seal surface may be grooved, the seal may not be installed flush and perpendicular to the crank, the seal may be defective or damaged during installation, an oil supply plug behind the flywheel may be leaking - what ever the reason, access is needed and a good visual inspection to pin point the exact location of the leak.
either there not in rite or the bolts need re-tightened
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