Cummins Internal Evans Coolant leak.
I have a coolant leak on a cummins ISX485 in a 2009 KW T660. The leak started in january of last year.
It was going through a qt a day at first. I would top it off in the morning after setting all night with the eng. off. As it got worse I took it to the local cummins dealer on 3/29/12. They could not get it to leak so we tried enj. cup o-rings this did not fix the problem. I p/u the truck on 4/6/12 went 45 miles to the house. Got up the next day and it was low on coolant. Took it back to get the EGR cooler replaced. I pick it up on 4/9/12 left the shop on a run. I got up the next day and had low coolant level. So far nothing has changed the coolant problem. I drove the truck for a another ten days. Took it off the road hoping it was a blown head gasket. I got the head off on 5/16/12. It was sent to a machine shop were they found two crack enj. cups. The head was checked for cracks and recon'd. After the head was put back on around 5/24/12 I drove the truck for a total of 400 miles over a weeks time around the house. I had no singes of a leak. The truck set till 10/1/12 then it was drove 70 miles and parked every thing was still good. The truck was drove a cuppel of times for a total of 30 miles still know problems. I went to pick the truck up on 3/7/13. I called 1hr head so the truck would be warmed up when I got there. They said that it was low on coolant. I left with the truck and drove it 70 miles. the next day it was 3/4 of a gallon low on coolant and the crank case breather filter light was going off. I pulled the filter out and it was covered with coolant. This was not the first time for this. I had to change it thru this whole process. This one was new when the head was put back on. I put a knew one on the truck. I left the house on 3/10/12 bob tailing. Then 350 miles later the crank case filter light was going off. This one was in the same shape as the last one. It was also low on coolant about a QT. I went about 75 miles more packed for the night. Got up the next morning and it was about a 1/2 gal. low. Drove for another 350 mils that day adding 2QT of water. Parked the truck over night. The next morning it was at least 1gal. or more low. Put it in a shop in the area. They have pulled a oil sample and found the there is 150 to 200 ppm of sodium in the oil. This oil only has 1300 miles on it. It had 2456 ppm sodium when I pulled the head off with 71443 miles on the oil. The sample before that was 33 ppm with 45801 miles on it. The shop has pulled the pan off and pressurized the cooling system looking for a liner leaking with no luck. They pressurized the cooling system up to 15psi and let it set for 24 hours with know leak found. I should say that I had the coolant conversion done in cookeville TN. on 7/5/09. Up till 1/2012 I had no problems.
Any help would be great
Is this a good question?