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#1
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water in oil
bored 318 30 over, rebuilt once, ended up with water in oil after about 1 hour run time. tore down, rebuilt again, only to once again have water in oil after 1 hour run time. hellllllllppppppp!!
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#2
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Before you freak out and start tearing the heads off, how much has come in? If it's a large amount, I would run the compression check to see if any cylinders are losing compression through a gasket. If it's a small amount, look at other things first like the gasket/sealer for the front timing cover/water pump (which is where the 360 in my truck leaked). Possibly water jackets in the intake gaskets into the lifter valley? Have a cup of coffee and relax so you can go into this with a clear head. There are a few places where they come close to each other....
Good Luck! |
#3
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What did you find the first time when you tore it down and rebuilt it? Did you have the heads pressure checked? I think I would also Do a compression check. Look at the plugs for antifreeze on the plugs or a cleaned out cylinder. I'm thinking maybe you have a cracked head.
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#4
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Was water in the oil, the reason for the first rebuild?
improperly installed timing cover may cause it. Cracked head, or block is more likely the case. |
#5
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A intake or intake gasket may be at fault too!
__________________
68 Coronet 69 Super Bee......new 500 cid comin soon! 73 Duster witha missing 440/727 |
#6
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I started up my 340 for the first time a few years back, only do discover coolant in the oil. The source was a tiny pinhole in the timing cover to the back of the water pump. It caused me enough grief that I never forgot. I am surprised that I have never heard of anyone else experiencing that same problem before. I am currently planning a stroker A, and have considered having the cover ceramic coated to prevent corrosion through that area (it really ruined my day).
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#7
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Do a leak down test, watch the water in the radiator for air bubbles. This will tell you which hole is your problem.
Pull the head and have it magged....then go from there. |
#8
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The source was a tiny pinhole in the timing cover to the back of the water pump.
That happens a lot with AMC motors. |
#9
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Re: water in oil
Quote:
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#10
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?
I have no idea why replacing the heads and manifold requires mass quantities of silicone rubber. There is a time and place for that stuff, and a very little goes a long way. I'd stay away from that stuff and take any more advice from the silicone adherent with a grain of salt, so to speak.
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#11
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i have also had similar problems, ive blown the intake gasket on it and it will push out or break into the water transfer port, sucking coolant into the valley, you said you rebuilt it the 1st time with aluminum heads? if they are very early edelbrocks? ive heard and personlay had a friend have 1 cracked right out of the box, he called edelbrock, they said they knew of the prob and sent him new heads, also, do not use siicone on head bolts, but a small amount of thread sealer on the intake bolts is ok, also dont forget the dab of silicone on the corners between the intake and head.
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