New to me cm871

[Rawze]

Red engines need special care and love when re-building them to get them right. Otherwise your efforts are wasted. Looks like you have a lot of reading and education on front of you to avoid problems. Here is some related reading...

http://rawze.com/forums/showthread.php?t...4#pid35624


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and as far as coolant goes,... before putting it on the roads, if you suspect coolant in oil, it will eat the engine up alive real fast. - Pull the oil pan off it and let it sit over night with 20-PSI on the coolant system. Take no chances with it...

(04-06-2018 )Rawze Wrote:  ...
- We let it sit over night with 22-PSI pressure on it and pulled the oil pan off the next morning. Low and behold, we searched and searched and there was zero signs of coolant getting into the oil. None whatsoever. We wiped everything down and spun the engine a few times over with the pan off and could not find any kind of coolant intrusion problem even though it is clear that there is a problem with the head, a gasket, liner... something.

After a couple hours of looking and wiping things down under the engine, we decided to bar the engine by hand slowly to see if we could get a better view. While turning the engine over by hand very slowly, when piston number 5 came up on a compression stroke, it started to gurgle and tiny droplets of water/coolant started to pour down the inside of the liner wall. Number 5 piston was leaking coolant out of the bottom of the piston. So far this tells us that there is a problem in the head or the head gasket.

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ref: http://rawze.com/forums/showthread.php?t...6#pid25356

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As far as oil consumption,... almost never does the piston rings wear out first on the ISX unless it has had some kind of severe carbon packing issue. The head and/or mid-stop on the liners wears out long before the piston rings do.

It having 750k on it, the rod and main bearings are due. - Drain the oil and pull the pan off it. Perform the coolant leak test mentioned above while it is off to see if it is getting coolant in the oil while your at it. -- Being lazy and not doing the rod/main bearings at 800k is the kiss of death for the ISX, where the next thing in the bottom end that wears out will be a wrist pin, sending a piston through the block with no warning whatsoever.

Lastly, do a few oil changes at 3,000 mile intervals to flush out all the years of soot buildup in the block and engine. Neglect and not changing oil often enough to keep soot amnd deposits out is what makes them eat overhead cams up.