I can usually find the answers to my questions by searching through the numerous post that are on this site, but this time I need some assistance that I couldn't find by searching. I have a NAA that has milky colored oil after only a few hours after an oil change.
I noticed the milky colored oil prior to the oil change and the coolant level was low, so I thought that I probably had a head gasket leak. So I started checking things in an effort to pin point the issue, prior to digging into a head gasket change. I checked the radiator for bubbles while the tractor was running with the thermostat open, but didn't see any. I didn't notice any oily residue floating on the top of the coolant either. I conducted a block test using a combustion leak test kit, but the test didn’t indicate any leaks. I did however notice that the radiator cap was rusted enough that the spring was not able to be compressed, so I thought that might be my problem, as it would allow too much pressure to build in the coolant system. So I installed a new radiator cap and changed the oil, but after only a few hours the milky oil has returned. I don’t know if this is an indication that I still have an issue somewhere or if the milky oil is just a byproduct of water that is still in the oil system from the radiator cap issue.
I also conducted a hot compression check on the engine. The results are 80psi, 70psi, 80psi, & 95psi.
I am using Rotella 15W40 oil, if that makes any difference at all.
So right now, I don't know what to check next, but don’t like the look of the milky oil and hoping that someone might be able to help me out. Anyone have any suggestions or encountered a similar condition before?
I noticed the milky colored oil prior to the oil change and the coolant level was low, so I thought that I probably had a head gasket leak. So I started checking things in an effort to pin point the issue, prior to digging into a head gasket change. I checked the radiator for bubbles while the tractor was running with the thermostat open, but didn't see any. I didn't notice any oily residue floating on the top of the coolant either. I conducted a block test using a combustion leak test kit, but the test didn’t indicate any leaks. I did however notice that the radiator cap was rusted enough that the spring was not able to be compressed, so I thought that might be my problem, as it would allow too much pressure to build in the coolant system. So I installed a new radiator cap and changed the oil, but after only a few hours the milky oil has returned. I don’t know if this is an indication that I still have an issue somewhere or if the milky oil is just a byproduct of water that is still in the oil system from the radiator cap issue.
I also conducted a hot compression check on the engine. The results are 80psi, 70psi, 80psi, & 95psi.
I am using Rotella 15W40 oil, if that makes any difference at all.
So right now, I don't know what to check next, but don’t like the look of the milky oil and hoping that someone might be able to help me out. Anyone have any suggestions or encountered a similar condition before?