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Old 06-20-2010, 10:52 PM
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283 oil leak

Hello, I am familiar with the newer small block chevy engines but I have never really worked on an older block. I just bought this car with a 64-68 283 and it is leaking lots of oil out of a breather on the back of the block right by the oil sending unit and distributor. Any suggestions for me? Thanks!

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Old 06-20-2010, 11:23 PM
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Quote:
Originally Posted by lt1tyrell
Hello, I am familiar with the newer small block chevy engines but I have never really worked on an older block. I just bought this car with a 64-68 283 and it is leaking lots of oil out of a breather on the back of the block right by the oil sending unit and distributor. Any suggestions for me? Thanks!
That tube was there to vent the crankcase- aka "road draft tube".

You may find that the engine has a lot of blow-by causing the "leak", unless the oil level is too high.

There are ways to convert the draft tube to a PCV valve system, but I'd want to get to the bottom of why there's so much oil coming from the tube.

You could start with a vacuum gage, and a compression check or leakdown test to determine the condition of the ring and valve seal.
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Old 06-21-2010, 12:36 AM
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Yeah I wouldn't be surprised if there's a lot of blow-by (rings), especially if the engine is original. I used to plug that hole and run valve covers with breathers. I'll put my money on that engine still being original. I don't know anyone that would put that set-up back on, after a rebuild (except for someone doing a "correct" restoration).
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Old 06-21-2010, 02:16 AM
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Originally Posted by lt1tyrell
Any suggestions for me?
Time to roll out the toolbox.
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Old 06-21-2010, 05:51 PM
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Ok thanks, so for a while I should be able to get away with plugging it and running breathers on the valve covers? I dont want to do anything major to it this summer.
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Old 06-22-2010, 06:54 AM
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You will most likely need a PCV setup. If it is blowing oil out the tube, it will probably blow it out the breathers as well if you don't have a PCV.
As mentioned above, you most likely have bigger issues. Oil from the breathers or vent tube usually means a tired engine with lots of blow-by
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Old 06-22-2010, 08:34 AM
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I did some more thinking and I might just put a bone stock 350 vortec in it for a quick swap. By the way it is in an old triumph tr6 so it does not need a whole lot of motor to get it going decent.
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