does any one the gpm on a allison ht740? thanks jim
Go to www.bulkpart.com with the Allison transmissions. You'll need up to 30gpm and 1" fitting. I used the DB-341DC-12 cooler with 12v fan as an auxiliary cooler in line with the oil to water cooler. The oil to air cooler is rated at 33,000btu's. The oil to water can be as much as 10 times more effective. Good Luck, TomC
would this oil cooler do the job without running theoil through the engine coolent ? thanks jim.
When the PO of my 5A put in the auto tranny he mounted a cooler a couple of inches in front of each radiator. When i first saw this i was a little concerned as to how the heat from the coolers would affect my radiators. The tranny runs so cool that the gauge for it has only moved twice during the 5 years we have had the bus. The first time was during our first year on the road when we were headed up the long hill out of Laughlin headed to Las Vegas during the summer when it was 107 degrees outside. I prefer to be farther north before it gets that hot, but that year we had to wait for some money from a property sale to show up before we could hit the road. :)
The only way to find out if the cooler will work is to install it with a temp gauge and see if the oil temp will stay below 250 degrees (more like 220 degrees is better). If that cooler isn't enough, then install another. I like using the original water to oil since it will warm up the transmission equal to the engine temp. Then in cold weather, it will actually keep the transmission warm. Any engine or transmission will last the longest if it is operating a constant temperature. It can be just as bad to operate either at a too cool temperature as operating at a too hot temperature. Automatics like to run at approximately the same temp as the engine. This is why I did not install my cooler in front of the radiator-even though I had the space (in cold weather it can make the trans run too cool). My fan run cooler has a 12v thermostatically operated fan. The hot oil from the transmission first goes to the air to oil cooler, where I installed the thermostat at the exit of the cooler (instead of the suggested intake side). I did this since I didn't want the fan coming on until the oil was 180 degrees coming out of the cooler. Then from the cooler the oil goes to the normal oil to water shell cooler then back to the transmission. This takes alot of the heat strain off the engine radiator. I'm pleased with the results. Good Luck, TomC
thanks for the help. jim