[DaveMunshaw44]

Hey guys, have a sad day, i have coolant in my oil of our Massey Ferguson 4840 v8 903 cummins. Wondering if anyone has some words or thoughts. Not sure what to do at the moment with the tractor.

Could it just be head gasket? or could it be holes in the sleeves? i have read a lot about them but need more insight.


All responses would be much appreciated.

 

[Ed_Hunter]

engine oil cooler

 

[Grainline]

Orings on liner

 

[wheatwhacker]

I am going with the orings in the liner as well. We had that happen on a 900 Versatile once. Cummins will do that sometimes after sitting over winter.

 

[SWFarmService]

Has it been sitting for sometime?

 

[coogan]

I was a cummins mechanic back in the 80's and we didn't see a lot of 903's even back then. Head gasket unlikely as you would be more likely to get combustion gas in the cooling system. Pin holes in the liners would make it hydraulic when you start it. To diagnose o rings on the liners we used to pull the oil pan off and look with a flashlight to see if anything was dripping ( what cylinder ) could be oil cooler too but don't remember where they were on a 903

If you pull the pan you need to pressurize the cooling system to make finding the leak easier.

 

[farmshop]

How much coolant? Have you tried draining to see how fast it comes back. Before we overhauled our 8640 it would put a little coolant in the oil maybe an ounce every 20 hrs we would drain it out and keep running it did this for a couple years till it started pushing coolant out the overflow. A compression check should tell you it its a head gasket Dont know how hard your pan is to pull but that would be the easiest way to check the liners.

 

[DaveMunshaw44]

hey guys thanks for the responses. We have just parked it for the time being. I have 2 other 4800s that we are running for now.

Where are you guys talking about with the orings on liner?

The 4840 only sat since last season, was running it this spring, added coolant this spring and run it around 2000 rpm but it was getting up there for heat on the gauge.

 

[MCatSHF]

Hello DaveMunshaw44
The o-rings on the replaceable sleeves (liners) in the engine. The sleeve is "wet", coolant surrounds the outer part of the sleeve & the o-ring seals between the outside of the sleeve & the engine block, keeping the coolant out of the oil pan. As others have said, pull the oil pan & pressurize the cooling system & check which sleeve is leaking. You will see (green if that's the colour that you're using) coolant leaking from between the bottom of the sleeve & the engine block.

 

[flatfoot]

I don't think there is an easier pan to drop, than the one in these tractors with this engine. Everything is wide open and they are fairly light too!!

 

[onionfarmer]

Most likely holes in the liner take the pan off and see where its coming from. Could be the oil cooler too. Because the liners are closer together than a inline six they have more liner pitting than a six. That is why changing the coolant filter and antifreeze is life or death. I use distilled water and antifreeze change every 2000 hours.

 

[herschel]

ouch, but four hours and a good front end loader and you can have that engine sitting on the shop floor.stand it on the bell housing and tear it down, buy a jobber engine kit 2850$, rod and main bearings, piston and sleeves, change crank seals, rear can be a ***** to get at in the tractor,heads are probably just fine. did one in frame and still have a kink in my neck from looking up. sounds like a whole bunch more work but it will be easier than laying on your back for hours. just bought 2 4900's one with bad crank, one with burnt cab.will be a winter project to make one out of the two. but will pull engine and rebuild it on the shop floor. after you do the rebuild buy a the turbo system off of a 4880 or 4900 and bolt it on. done two of these and what a bonus add on. on the other hand my old 8440 jd had coolant in the oil one spring, always check, and a jug of iron tight fixed it.