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Discussion Forum

Water in oil

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Author  [Modern View]

09-06-2012 01:25:06

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Hi guys. I think I have big problems. I have my dad's MH44k with Continental H260 engine (been in the family since new in 1948) and recently on shutdown, the radiator made a big sigh!

Couple more small runs and yes, water in the oil (all milky). Started her up and bubbles and water coming out top of radiator. Far in excess of expansion due to heat. It was pouring out. I should say I had to top the radiator up with a LOT of water prior to this last start.

Ah ha, I hear you say...classic symptoms of a blown head gasket. So I took the head off and off to a head specialist to be pressure tested and head and gasket all ok.

He suggested dropping the pan and look for corrosion around bottom of sleeves. However I could not see any evidence of this.

Any and all thoughts appreciated. Rod.
This post was edited by HeyCharger at 03:17:07 09/06/12.

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09-07-2012 18:03:29

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 Re: Water in oil in reply to HeyCharger, 09-06-2012 01:25:06  
give it a treatment of irontite, I have a 75% sucess rate with it on stuff I really didn't feel like spending a lot of money on. Dad's 270 Leyland has been leak free for 2 years now.

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09-06-2012 20:45:03

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 Re: Water in oil in reply to HeyCharger, 09-06-2012 01:25:06  
Head back from shop - perfect.

Put back on, torqued up. plugs out, compressed air in and ALL cylinders can make air/water come out :-(

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mike mix

09-06-2012 12:04:25

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 Re: Water in oil in reply to HeyCharger, 09-06-2012 01:25:06  
With the head back on, put pressure in the cylinder with the piston at tdc about 100psi look for bubbles at the radiator opening. move the piston to bdc and again add air to the cylinder looking for bubbles at the radiator. You may have to loosen the rocker arms to keep the valves closed at bdc. I have heard of cracks devloping between cylinders on some engines. good luck mike

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Mike in Mn.

09-06-2012 07:02:23

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 Re: Water in oil in reply to HeyCharger, 09-06-2012 01:25:06  
If you are satisfied that it's not the head or gasket and not the o-rings, then it may be a pin hole in a sleeve. There is usually so much goo in the block around the sleeves on an old engine that the o-rings couldn't leak if they wanted to. Sounds like you are getting compression pressure into the cooling system, that means combustion pressure, not a leak. I have seen sleeves crack around the upper flange and leak but its usually visible with the head removed and not on an older engine that hasn't been apart. With the head back on stick an adapter in the plug hole and run a couple hundred pounds of air pressure in each cylinder and see which one blows bubbles in the radiator, good luck.

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09-06-2012 05:47:28

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 Re: Water in oil in reply to HeyCharger, 09-06-2012 01:25:06  
There's an old trick of placing paper underneath with oil pan off and finding leak. You may as well hot tank and then magnaflux and rebuild.I had a leak on a 20 that only showed up with air pressure(7 lbs.) and when the hose blew it scared the bejesus outa me!

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