Water in crankcase

[Bondo]

Oh well, I can now officially say it is a "BOAT". It takes up a ton of storage space and doesn't do anything but take my time and money.

Ayuh,..... Welcome to the Club,..... Keep Us updated with the tear-down,....

Ya might get lucky, 'n the intake is responsible for the water in the oil,...

 

[Lou C]

"I'm sure the intake manifold bolts will require some finess and even possibly some drilling and tapping."

​Well, mine lived in salt water for 15 years and they all came out. The manifold bolts and the head bolts. I used hand tools on the manifold bolts and a De Walt cordless impact on the head bolts. It was actually harder to get the intake off than the heads. Those old baked on intake manifold gaskets get like cement!

 

[klonteig]

Do you have water in the oil? If not, then might be more likely an exhaust or head issue vs. block. Or just very weird block crack that is very high in the cylinder. There's a lot of water ingress obviously (presumably into #5), with that much water I would expect to find water in your oil if it was a cracked block or an issue with the piston or rings. No water in the oil would indicate that the piston is pumping water to the exhaust side but not letting it by to the oil side, which would lead me to suspecting the top end, heads and valves, etc. No point in theorizing anymore, though. Time to tear down and find out for sure. I would not be running it anymore until the cause it determined.

 

[kschnebly]

Do you have water in the oil? If not, then might be more likely an exhaust or head issue vs. block. Or just very weird block crack that is very high in the cylinder. There's a lot of water ingress obviously (presumably into #5), with that much water I would expect to find water in your oil if it was a cracked block or an issue with the piston or rings. No water in the oil would indicate that the piston is pumping water to the exhaust side but not letting it by to the oil side, which would lead me to suspecting the top end, heads and valves, etc. No point in theorizing anymore, though. Time to tear down and find out for sure. I would not be running it anymore until the cause it determined.

Yes the crankcase had a lot of water in the oil and the exhaust was fogging.

 

[kschnebly]

So I did not see anything specific when I got the exhaust and valve covers off. I need to keep digging but I have started researching remanufactured engines. I was glad (oddly) to find that I could buy one for around $3200. What I have since discovered is that is not for a Magnum Motor. I actually can't find a remanufactured Magnum at any of the motor shops I have searched online. Anyone have any suggestions?

 

[smiles16]

Find a junkyard that has old motorhomes. Many of them are sitting in the scrap pile with goog 30k miles or less 454 engines. For a few hundred bucks and some time swapping over the marine components, you have a reliable replacement engine. Just a thought.

 

[kschnebly]

Well after two years I have finally started the disassembly and repair on the motor. Thought I would share the recent discovery. The I was cleaning the off the top of the intake with my shop vac on sunday and decided I would also suck any water out of the Thermostat housing that may remain. I didn't notice anything odd when I did this however last night as I was working to remove some heavily corroded intake bolts I happened to look down into the bottom of the thermostat housing on the intake and noticed a dime sized hole corroded straight through to the crank case. I think I have found at least one of my sources of water. Now to get the intake off and check the heads.

 

[Rick Stephens]

Ain't that something! Looks more like a crack than a corrosion hole though. Very weird.

 

[Scott Danforth]

if that motor sat for 2 years with water in it, consider it a core

 

[kschnebly]

if that motor sat for 2 years with water in it, consider it a core

Its been doom and gloom in most of the replies since the beginning so why should it be any different now?

 

[Scott Danforth]

Water in a block starts rusting parts within 24 hours as the oil film breaks down

Just be prepared when you pull the intake

 

[kschnebly]

Intake is off and finally get a few of the crank case. I am glad to see that my heads and intake are actually oval port instead of rectangular. This is going to make replacement parts a lot easier to find.

 

[Scott Danforth]

BBC heads are a dime a dozen. they are everywhere.... just a bit more expensive than SBC heads

what castings do you have?