05-22-2018, 05:10 AM
Chester: I am not disputing your observation, I accept you saw what you saw and am only curious to explain what brought that about. Two thoughts:
1) If the World Transmissions are plumbed the way my HT-741 is, the temperature on the dash gauge will be the temperature of the oil coming out of the converter and going to the cooler. The reason for this is that converter use is the most common source of heat generation in the transmission and the gauge gives us an indication of when we should back off the throttle since hard throttle is the usual trigger for the converter. I can only wonder if the downshift somehow managed to force the converter to unlock. I wouldn't think that would happen but maybe is does for reasons I can't conjure.
2) My HT-741 runs the transmission oil through the bottom tank of the engine radiator. If the newer coaches have completely separate radiators for the transmission oil then there are a variety of possibilities such as lack of airflow that excessive heat could overwhelm.
1) If the World Transmissions are plumbed the way my HT-741 is, the temperature on the dash gauge will be the temperature of the oil coming out of the converter and going to the cooler. The reason for this is that converter use is the most common source of heat generation in the transmission and the gauge gives us an indication of when we should back off the throttle since hard throttle is the usual trigger for the converter. I can only wonder if the downshift somehow managed to force the converter to unlock. I wouldn't think that would happen but maybe is does for reasons I can't conjure.
2) My HT-741 runs the transmission oil through the bottom tank of the engine radiator. If the newer coaches have completely separate radiators for the transmission oil then there are a variety of possibilities such as lack of airflow that excessive heat could overwhelm.
Jon Kabbe
1993 coach 337 with Civic towed