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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 350/Water in oil

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Jim in Oregon

09-06-2004 14:47:29




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I've got a problem. My JD has milky oil. It sat for about 4 years before I got it, has never overheated since I've owned it. I have put about 30 hrs on it since I've owned it, and the oil has been clean for at least the last year. I checked the oil after it has been sitting for about a week, and it was milky. Could someone please tell me where to start looking.
Thanks,
Jim in Oregon




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G.Lewis

09-07-2004 04:35:25




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 Re: JD 350/Water in oil in reply to Jim in Oregon, 09-06-2004 14:47:29  
You are going to have to do at least an in-frame overhaul. You are going to find a failed "O" ring in the bottom of one of the cylinder liners, probably #2. You will also find pitting and cavitation damage running down the side of the liner past the "O" ring groove. The regular changing of anti-freeze and the use of an anti-cavitation additive will help prevent this in future. It is common in many diesels. Ford/Navistar had a similiar problem with the old 7.3 blocks. They don't have cylinder liners but they developed pin holes due to cavitation.

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Roy Suomi

09-06-2004 21:08:15




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 Re: JD 350/Water in oil in reply to Jim in Oregon, 09-06-2004 14:47:29  
Betcha got liners with holes in the sides of them. Very common on diesel engines.. I'm doing a JD 310-C for one of my customers. He swore up and down it was a head gasket, not so



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Robert F.

09-06-2004 20:56:58




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 Re: JD 350/Water in oil in reply to Jim in Oregon, 09-06-2004 14:47:29  
Hi Jim, First, how old is the oil that's in there? If the machine sat for a very long time in a moist climate, then perhaps condensation could account for it. (It's a long shot...), and it could have not shown up for a while because it didn't get stirred up off the bottom of the pan.

Eliminate the possibilty of water getting in there via rain into an opening or service error or etc.

Then try deaining just a tad of oil, if more than a tablespoon of water comes out with the oil, you'll have to look further. If not, then just change the oil and keep an eye on it. If a lot (say, more than a half-cupful) comes out you've likely got a leak.

The next thing to check is to run the engine (don't run it hard with milky oil...)with the radiator cap open and look for any sign of compression leakage into the coolant. This will look like bubbles, or oil, or even smoke, not steam, coming out at the open radiator cap. A radiator pressure tester is a more accurate way of testing; a steady rise in coolant pressure in operation is a sure sign of a leak.

If so, the likeliest culprits are a leaking head gasket or a cracked head or block.(aaargh!). It's difficult to tell which, but in either case the head has to come off. Also, check the spark plugs, (or injector tips?), and look for one that is a lot cleaner than the rest. If there is one, then that cylinder is the one with the leak.

With the head off, careful examination of the head gasket and sealing areas will usually reveal a leak. In this case, a tiny gap is all it takes.

If none is found then examine the cylinder bores and head, but a leak here can be hard to find; this is a good point to ask for help. The block and head can be pressure tested, but probably involves a complete teardown, and could still be inconclusive.

Good luck. let me know what you find.

Robert

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2x4

09-06-2004 20:37:33




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 Re: JD 350/Water in oil in reply to Jim in Oregon, 09-06-2004 14:47:29  
That engine has knock-out cylinders. On the lower end of these cylinders are grooved rings that rubber seals fit into. These seals may have went bad.



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