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Old 03-24-2012, 04:27 PM
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SBC. TBI. Leaking oil from head

Hi,
I had removed the head from one side and then put it back on. After starting the engine, I see that it is leaking oil from the rear of the head, where the head meets the block.
My question is:
Is it worth trying to re tighten all the bolts, or I should not bother and redo the whole thing.
The head appears to be seated properly.
My only guess is that I did not torque all the bolts down properly.
I'm trying to avoid having to take off the intake manifold and having to drain the radiator, plus a slew of other stuff that's involved with that.

Thanks for your help.

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Old 03-24-2012, 06:01 PM
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I know the intake bolts need to be re-torqued. Sometimes I do mine up to 4 times. If it was the head you'd have a cooling leak, not oil. But it sounds like the rear seal on your intake. I blew one out once and BIG leak in the back.
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Old 03-24-2012, 08:52 PM
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So that is exactly what I wanted to hear.....an easy fix.... Maybe. I'll let you know.
It is interesting to know that if it was the head bolts, I would be leaking coolant.

Thank You
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Old 03-25-2012, 09:44 AM
boatbob2
 
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leaking oil......

Hi,before i replace an intake manifold,i ALWAYS take a center punch,and punch marks about 1/4 inch apart,all along the front and rear,of the block,instead of using those crappy manifold end gaskets,i put down a 1/4 inch bead of RTV,and i run the RTV up onto the head about 1/2 inch,on all 4 corners,that way im sealing the entire surface,ive never had an oil leak after doing it this way.there will be some squeeze out of the RTV,let it dry,and cut off the excess with a razor blade.ive never had a problem,with the squeeze out inside the lifter valley. dont forget to REMOVE any oil from manifold surfaces,before installing.

Last edited by boatbob2; 03-25-2012 at 09:54 AM.
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Old 03-25-2012, 10:47 AM
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Hi,
I've narrowed it down to a leaking valve cover, or the manifold ends. I did use RTV at the ends, but I put down a very thin bead. After installation, I saw that the manifold did not make full contact with the block, so the thin bead was not enough to make a full seal. I'm betting that its this that's causing the leak. (I had never done it before, so I assumed that the intake made full contact with the block and a thin bead would be all that's necessary)
I'll try the valve cover first, just because it's the easiest to get to.
Thanks for you advise.
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Old 03-25-2012, 04:47 PM
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valve cover is worth a try to save time an money but id be willing to bet its that intake seal, i had plenty of issues with not putting enough rtv on the area, you really do need a heafty bead to do the job.
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Old 03-25-2012, 07:44 PM
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I bet you are right. I'm pretty sure it's the intake seal as well.

Oh well, live and learn.
Thanks for your help.
The people on this site are amazing. I would have been lost from the beginning if it wasn't for the help I've found here.
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