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Discussion Forum
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Coolant leak in AC-B

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Birt

11-26-2002 05:37:11




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I am not a mechanic. I purchased a supposed running Model B from a dealer. I found that antifreeze was leaking into the oil. I have pulled the head, pistons and sleves and have not found the leak. In fact, when I pulled the sleves the block was still full of coolant. What do I dso next? I am not a mechanic and I'm way in over my head. Any ideas or suggestions. I may end up with a rusting lawn ornament. Birt

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Tom

11-26-2002 17:52:35




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 Re: Coolant leak in AC-B in reply to Birt, 11-26-2002 05:37:11  
A lot of farmers who were not machanics worked on these tractros and they are still going. You can too, just keep positng questions here, there is a lot of experience and knowledge here. And get yourself a set of manuals, it will be money well spent. The best are the Allis Chalmers reprints. Get a Owners manual, Repair manual, and if you can find one a parts book. Even if you don't use it for ordering parts it is a very useful thing to read just to see how the parts go together and the relationship of them, believe me on this one.

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Tom

11-26-2002 17:52:26




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 Re: Coolant leak in AC-B in reply to Birt, 11-26-2002 05:37:11  
A lot of farmers who were not machanics worked on these tractros and they are still going. You can too, just keep positng questions here, there is a lot of experience and knowledge here. And get yourself a set of manuals, it will be money well spent. The best are the Allis Chalmers reprints. Get a Owners manual, Repair manual, and if you can find one a parts book. Even if you don't use it for ordering parts it is a very useful thing to read just to see how the parts go together and the relationship of them, believe me on this one.

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Phil Auten (Tx)

11-26-2002 09:22:30




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 Re: Coolant leak in AC-B in reply to Birt, 11-26-2002 05:37:11  
Birt,
A-C B/C/CA engines have a freeze plug in the top of the cylinder head near the center. Remove the rocker arm cover and run the engine at idle. Check this freeze plug for leaks. It's the easiest fix. Another possibility that hasn't been mentioned is the o-ring seals at the bottom of the cylinders. If these leak, you get water in the oil but it is usually a really slow leak. Replacing them does require an engine teardown.

Good luck, hope it's the freeze plug,
Phil

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Denny

11-26-2002 07:21:04




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 Re: Coolant leak in AC-B in reply to Birt, 11-26-2002 05:37:11  
Birt, Brian's comments are right on. One other source is a cracked head. I had a cracked head on a WD and the antifreeze ended up in the oil. When I pulled the head, two of the pistons had antifreeze on the top of them (pistons were dished). I suggest that you find some place like NAPA to have the head pressure tested.

More comments on the seals. Check them out very carefully when you remove them from the sleeves. Look for cracks in the o-ring or general deteriataion. You will need to put in new ones as these are not expected to be reused. They aren't very expensive - generally about $5 each. Email me if you need a source. Clean the seal point for the sleeve with a good solvent. Using 220 or finer wet or dry sand paper, clean up the sealing surface. I usually use a cylinder hone to get them smooth - the cleaner and smoother, the better chance of a good seal. After you have cleaned them up good, do the inspection looking for anything that would prevent a seal (for instance - a crack - most likely between the cylinders). If you find anything suspicious, I'd have the block magnifluxed (NAPA or someone can do this for you) just to make sure. The crack may be so obvious that magnifluxing is not warranted - you need a different block. If things look good, and if the o-rings looked suspicious, you can reassemble the sleeves with new o-rings. There are proceedures for putting these in that minimize potential damage to the o-rings. Email me.

Before reinstalling the pistons, I recommend you hone the cylinder walls. If you aren't changing the rings it will help reseat the rings. If you are changing the rings, it is mandatory to get the new rings to seal. If you don't have a hone and don't want to buy one, you may be able to rent the hone from an auto parts store like NAPA or Autozone.

You aren't over your head. You are just learning a new skill!

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Brian

11-26-2002 06:41:40




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 Re: Coolant leak in AC-B in reply to Birt, 11-26-2002 05:37:11  
Look your block over for cracks down where the sleeves seal. Sleeve seals can be the cause for leaks. Don't worry about any cracks between the cylinders if they are on the head deck. The head gasket will seal these. If you do have a crack down below, good blocks are readily available and easy to find. Reasonably easy job to swap the engine if you need to.



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