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Allis Chalmers Discussion Forum
Show Parts for Model:

Re: AC model C - coolant in oil

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Noah in IA

08-12-2012 14:13:41
166.181.3.69



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Dick L-

I did not have the engine running when pressure testing. Per your suggestion, this morning I filled the three core plug pockets with oil and re-pressurized to 7 psi - still no air bubbles or coolant leak. I then proceeded to drain all the new oil I had just filled it with and then drop the oil pan. I would estimate at least two cups of water/antifreeze poured out the drain plug before uncontaminated oil started to flow. Next, I again pressurized the radiator and looked up into the engine to check for leaks around the cylinder sleeves - still nothing. Now I am thoroughly confused! - how can it be that after changing the oil, driving it back into the shed, and then doing various pressure tests that I could accumulate two cups of water in the oil pan and now when I pressurize the system with no oil pan attached that I see no coolant flowing down into the open cavity where the oil pan would be? Please forgive my ignorance as I'm a novice at engine work, but I thought that regardless of the leaks location I would see antifreeze drain back to the oil pan. Any advice? Do I need to pull the head next and inspect the head gasket? Thanks again for any advice!

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Dick L

08-12-2012 18:25:18
50.51.170.62



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 Re: AC model C - coolant in oil in reply to Noah in IA, 08-12-2012 14:13:41  
Could be a bad head gasket that takes compression to blow the water into the oil.



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old

08-12-2012 14:24:50
209.86.226.34



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 Re: AC model C - coolant in oil in reply to Noah in IA, 08-12-2012 14:13:41  
It could well be a heat related type of leak and those can be hard to find at times. A head gasket or sleeve o-ring either one can leak when warm/hot but not leak when cool



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Noah in IA

08-13-2012 18:45:47
166.181.3.225



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 Re: AC model C - coolant in oil in reply to old, 08-12-2012 14:24:50  
old-
I'm starting to think this may be the case (leaks when hot but not cold). I pulled the head tonight and inspected the gasket. I didn't see any obvious blow-outs or staining (of course this is the first head gasket I've ever seen - what other clues on the gasket/mating surfaces should I be looking for?). I checked the head and block mating surfaces with a straight edge and they seemed as true/flat as a framing square can indicate...now on to the possibly interesting part...I took another look up into the engine tonight from where the oil pan would be and noticed some black crud hanging from the outside surface of a couple of the cylinder sleeves where they interface with the block. I reached up in and grabbed a chunk with a needle nose - it appears to be the dried up remnant of an oring?! could this be the case? Could it be that they are so rotten and hardened that they've made their way down the sleeve and exposed themselves? I plan on pulling this sleeve tomorrow night if time allows to further inspect. Please let me know your thoughts - Thanks again all - your advice thus far has been a great help

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old

08-13-2012 19:28:02
209.86.226.19



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 Re: AC model C - coolant in oil in reply to Noah in IA, 08-13-2012 18:45:47  
Could be part of an o-ring but not real likely because if it was the sleeve would most likely leak all the time. As for the head gasket it seals the top of the sleeves and can be easy to leak there if the sleeves do in stick up just a very little bit. The sleeves should sit up just enough that if you run your finger nail over them you should catch you nail on the sleeves. If not then that could be your problem BTDT and had once where the block was planned with the sleeves in and that in turn cause the sleeves to leak

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