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In most all cases first you must know whats leaking and next remove the old gasket seal or sealant and repair or replace that part's. , EzForJesus

It is possible to replace the rear main bearing seal without removing the engine in a rear-wheel drive vehicle such as the S10. First remove the transmission, drain the crank case engine oil, then remove the oil pan. You will need to loosen the crankshaft bearing cap bolts enough so that it will give you enough clearance to slide the old main seal off the back of the crank and then replace it with the new one.

Depending on where your leak is there are various ways to solve the problem. If it is a minor leak you can use a oil stop leak and it may do they job. If not most likely it is a bad gasket which will need to be replaced and properly sealed. If it is as bad as a cracked block then there isn't much you can do.

I had a Chevy S-10 & changed the rear main oil seal too. The 2nd time we did it I was informed by a better parts dealer that Chevy had a faulty design by putting a U seal and now has a O seal. The O worked great. what a concept!

Oh if you have an oil leak from the main seal yes it is possible to do but you DO NOT have to take the transmission out and DO NOT loosen that main crankshaft cap if you do and you don't put it back to torque specs you could blow your engine up or spin a bearing just take the motor mount bolts out lift the engine a little bit for the oil pan to clear the cross-member and take the 15-16 oil pan bolts out my suggestion is that u get a rubber gasket there easier to work with and you don't need any sealant

My room mate has an 86 S-10 4X4 Blazer and I initially thought the rear main seal was leaking. Then it started leaking real heavy, so I removed the skid plate under the motor to find that it was an Oil Pressure Switch that is located under the driver's side exhaust manifold (difficult to get to, to say the least). There was a normal oil sending unit on top and this huge OP Switch under it. The OP Switch has a weep hole, like a water pump has, that leaks oil when it goes bad. A very dumb idea IMHO.

Although I had to remove the exhaust manifold to replace it, it was still better than dropping the tranny to change a rear main seal so I was thankful. Look to the OP Switch first (on those S-10 Blazers) before tearing into the rear main. It might save you some trouble.


I sure don't know anything about oil leaks, but I do know one thing: do not ask BP as they do not know either.

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โˆ™ 2015-07-15 21:50:14
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Q: How do you fix an oil leak?
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