16/09/2026
This week's update consists of good old dirty diesels, and specifically Loco 58 (HE7409).
One the past few years we've been having intermittent faults with the torque converter overheating, and recently the torque converter has been overheating on a fairly regular basis.
With Loco 1 currently (touch wood) in good working order, the time has been taken to remove 58 from regular traffic to try and rectify the issue.
Jonesy, (aka. the Diesel Engine Caresser) has been set on the task of finding out the cause of the issue, which has given him hours of detective work.
Initially, some thorough detective work was required to fathom out how the cooling system worked, which he managed to work out uses diesel from the fuel tank to cool the converter, and then the diesel is in passed through a heat exchanger to be water cooled.
This heat exchanger which consists of around 60 small tubes was one of the areas identified as being a possible cause of the overheating. Upon investigation, out of those 60 tubes, 58 of which were found to be blocked!
With the heat exchanger being about 5ft long, very heavy and very awkward due to access being from between the bottom of the engine and the frames, Jonesy decided it was best to strip and clean it in situ. After lots of riding out and reassembly, the system was refilled and tested for leaks.
The locomotive was then tested, which successfully, the correct torque converter pressures were achieved in the first time in a number of years, and with a short test to see if she overheated, she didn't. The actual test will come once the locomotive starts pulling trains on whether the issues with the torque converter have been rectified.