hello all, I have recently purchased a used mx5000 with less than 500 hours on it. I got this machine very cheap because of the issues. I have been reading up on the most likely causes; frost plug, head gasket, cracked block,etc. Anyone have ideas as to where to start? Pressure test?
Oil in coolant and coolant in oil
- Thread starter Mx5000
- Start date
could be any of the above. You can do a pressure test but it might or might not tell you anything you don't already know.
North Idaho Wolfman
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Whenever anyone says they have both issues as you do, I find the outcome of tearing it down never to be the best outcome. 
I have alsoheard people mention the oil cooler when there is oil in the coolant and coolant in the oil. Any one else heard of this? I am trying to cover any easier fixes before I get the head off.
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Nope there is no place that oil and water intersect besides inside the engine.
You're most likely going to find that's it's:
#1 blown head gasket (semi common)
#2 cracked head (if over heated, very likely)
#3 leaking freeze plug, (rare)
#4 Cracked or Compromised block (VERY rare)
North Idaho Wolfman, Sorry, but that statement isn't true!
As far as Messicks/Kubota parts layout is concerned, the MX5000 has a water cooled oil cooler, and if there is corrosion or other problem with it, I would expect oil and water could mix together easily.
I'd certainly be looking at it before tearing anything else down, even if it isn't a known failure point.
MX5000, you could bypass the water lines with a joiner for a start, it doesn't need a cooler while you are not working it hard. It's possible you could remove altogether and get a threaded nipple to just put the filter back on, I expect it's just an add on on that engine. You can also get a pressure tester as mentioned, or a combustion gas tester like this one.
https://www.summitracing.com/parts/...MIqcm32s3t2wIVFQOGCh3lFwOUEAQYASABEgLIWvD_BwE
https://www.summitracing.com/parts/...MIqcm32s3t2wIVFQOGCh3lFwOUEAQYASABEgLIWvD_BwE
After looking at the oil cooler last night. It seems that the water lines are not even connected as there are two male barbs with no lines to them. Does this seem right to you guys. Also when you remove the dipstick while the engine running oil will spray out. Not sure if this helps
My thoughts are with head gasket, cracked head or worse, I just have to throw a bit at NIW as he's pretty keen on hammering me if my posts are correct or not!
You could be lucky with a gasket, blown to water and oil gallery, I really hope that's what it is, but you're not going to know without further investigation.
You could be lucky with a gasket, blown to water and oil gallery, I really hope that's what it is, but you're not going to know without further investigation.
A cylinder head crack should be easily recognizable. Typical crack forms from exhaust valve seat to pre combustion chamber. If any doubts, there are ways to make it more visible or could take just the head to a shop to have it examined.
Given that fluids are mixing, it needs looking into.
Given that fluids are mixing, it needs looking into.
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Sorry, But I still consider a part bolted to the engine "inside the engine", it's not like it's circulating oil through the radiator.
But Hey congrats you caught me making an error!
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Water in the oil, oil in the water - Got to pull that head. If there is an oil cooler however that relies on the radiator to cool the oil - - that will be your only hope for not removing the head.
If I were you I would let NIW and LugBolt duke it out over whether or not your tractor has one - - They are both pretty sharp, and if it is simply a bad oil cooler (heat exchanger inside the radiator) you will be a lucky man.
If I were you I would let NIW and LugBolt duke it out over whether or not your tractor has one - - They are both pretty sharp, and if it is simply a bad oil cooler (heat exchanger inside the radiator) you will be a lucky man.
Well actually your response was in direct relation to the oil cooler, because you even quoted it.Sorry, But I still consider a part bolted to the engine "inside the engine", it's not like it's circulating oil through the radiator.
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Yes I know the coolant plate that is bolted to the gear case.
And Yes your right water and oil could mix in it.
Yes I was ...well Wrong I guess?
And Yes your right water and oil could mix in it.
Yes I was ...well Wrong I guess?
North Idaho Wolfman
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Actually it's heat exchanger on the side of the gear case, that runs water through the plate around the oil and then water into the radiator.
I think the OP said the water line has been removed from it, so that would eliminate it as a cause.
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North Idaho Wolfman
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Before you go to far, I would drain all the coolant out. Then, get a good radiator flush and wash the coolant system out good. Maybe even doo it twice. Then fill it up with water only and run it a while to see if oil shows back up. If the oil cooler has been disconnected already, that could be the culprit and the previous owner my have disconnected it because it was leaking, but did not get the oil cleaned out of the coolant system. I had a Ford TW-30 Tractor back in the 80’s on the farm that the oil cooler went bad and filled the coolant system up with oil. Took quite a lot of cleaning to get it all out, then put a new cooler on. Remember that for oil to get into the coolant, it has to be a leak where the oil is under pressure.