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Discussion Starter #1
Hey I need a little help!

I changed the oil in my early 1970's 401C backhoe.has the 4 cylinder diesel and noticed that I had quite a bit of oil.

now today I noticed the radiator was down some, put about a half gallon in and checked the oil. and low and behold the oil lever is way over on the dip stick.

My question is do these engines have a problem with this?

What would be the first thing to look at to diagnose the problem? I am thinking head gasket or head.

my next question is are parts available?

Any information would be greatly appreciated.

Thanks Steve!
 

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Hiya,

Well, if there is ethylene glycol in the coolant I would suggest you not run the engine until you have the oil analyzed for coolant. If you continue to run it with coolant contamination you will most likely damage the bearings and or cam/lifters. Coolant in the oil is nothing to play around with.

The reason I say get it analyzed is that it could also be Diesel getting in the sump from a bad lift or secondary pump/injector or hydraulic fluid from the pump if it's integral to the engine block or front housing. Either of these is still an issue that you shouldn't be running the engine however they are most of the times not as bad of a scenario like coolant is.

A lot of old timers will tell you to pressurize the cooling system and listen for dripping in the sump, sometimes that works but most of the times it's very difficult to hear. Most autoparts or Diesel shops should have an oil analysis kit you can buy and mail off to get the results in a few days.
 

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If you have run the engine since noticing the coolant loss, then the oil should be a milky color. If you have NOT run the engine, just loosen the oil drain plug a bit (DON'T remove it) and see what comes out first. The water should settle to the bottom and you should get water out past the threads of the plug before you see any oil come out.

As to the source, my first guess would be head gasket or cracked head. SOME engines have oil coolers that can leak but usually the oil pressure will force oil into the coolant system. I have also seen an engine with wet cylinder liners leak coolant by the sealing O-rings when the engine cools down.
 

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Most autoparts or Diesel shops should have an oil analysis kit you can buy and mail off to get the results in a few days.
I've used Blackstone Labs for oil analysis a few times. Not only do they provide the oil breakdown numbers they also send you a hand written overview of their findings. On the one engine that was showing metal particles in the oil they even called me to discuss.
 

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Discussion Starter #5
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Well it is coolant!

Took the head off and sent it to my local machine shop. Head passed the Mag Flux and pressure test.
Machine shop states that the valve guides are a little off. but the valves are good along with the springs, replaced the valve seals.

He is telling me that more than likely one of my liners is cracked or "Caveated" I guess that is rusted.

Tore the oil pan off tonight and man I was impressed. No one has ever been in there.
Things all clean no sludge. Took the pistons and rods out.

Bearings look good and are standard. Looked at the sleeves. No ridges or scratches.

So I guess I will pull the sleeves and look at the O. Rings.

Any one have any other Ideas of what else I might look at?

And where can I find torque specs? And torque patterns?

Any suggestions on how to flush the antifreeze out of the motor?

Thanks Steve!
 

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Discussion Starter #6
Well the O rings on the cylinder liners are toast. Pulled them today. Now I start the process of ordering parts.

Any and all advice would be greatly appreciated.

Steve
 

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Way back in the last century when I overhauled my old JD300 industrial tractor, I replaced the liners. I packed the new liners (in plastic bags) in an ice chest, iced them down and then dumped ice cream rock salt on the ice to make it extremely cold. They stayed that way about 4 hours and when I got ready to install them they just dropped in place without having to force the installation at all. That's about the only tip I got for this situation. Good luck!
 

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Not sure IF you pulled the sleeves / liners out. I suspect that you did. Check the O. D. of the sleeves for any indication of pitting and deterioration. Diesel engines can suffer from "cavitation erosion" which can ultimately cause pitting, perforation of the liners and coolant leaking into the crankcase. The liners and seals should be replaced. Cylinder "kits" are usually available that include matched pistons, rings, sleeves and seals.

Cavitation erosion http://www.howardenterprises.com/Portals/0/PDFs/Cavitation%20Erosion.pdf
 

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Hiya,

Some time ago I wrote a detailed posting on cavatation, it's causes and what DCA/SCA does for wet sleeve engines but not normally needed on cast-in blocks in response to a question if to use DCA on a Yanmar Diesel. I can't find it however one of the better searchers here can find it for you.
 

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Tom, Here is one, post #4

Tom's Post

Is this the one Tom?
 

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Tom, Here is one, post #4

Tom's Post

Is this the one Tom?
Randy, no, sorry. The one I was looking for was one I wrote in reply to someone saying they added SCA/DCA into the coolant on a small Yanmar in like a 455 or a sub-cut and I replied about the cast-in liner Yanmars not needing it and it actually causing harm because it doesn't get consumed like it does on a wet liner engine. Wonder if someone moved it to the tech forum?
 

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Randy, no, sorry. The one I was looking for was one I wrote in reply to someone saying they added SCA/DCA into the coolant on a small Yanmar in like a 455 or a sub-cut and I replied about the cast-in liner Yanmars not needing it and it actually causing harm because it doesn't get consumed like it does on a wet liner engine. Wonder if someone moved it to the tech forum?
Shouldn't matter, should still come up in the searches.


Well, there is this one.

Tom's other Post
 

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