The cooling capacity isn’t the warmup issue on the A0, the plumbing is. On the normal bypass type cooling system, cat sent the warm water exiting the head out the bottom of the thermostat housing and right back to the waterpump and back thru the engine. This loop recirculates until the engine warms the coolant enough(178F) and the thermostat opens.
On the A0 they diverted this bypass flow out the bottom of the thermostat housing and sent it to the transmission heat exchanger. So untill the trans becomes a heat source and all that extra mass is warm, the engine will never warm up… Basically you have a large unregulated aluminum radiating surface to contend with.
The 3116 is mechanically governed, so you need to insure that full pedal depression is rotating the linkage on top of the governor to the high speed stop. The governed RPM on the top label sticker on the engine is 2600RPM. You then need a photo tach or a volt meter that reads frequency to determine that the engine is reaching 2600 RPM when the linkage is against the high speed stop. There is a tach sensor on the top left bellhousing that senses the 133 tooth flywheel ring gear, so a freq counter or a multimeter that reads frequency measuring the output of that sensor can get you a reasonably accurate RPM. 2600 RPM X 133 teeth divided by 60 seconds = frequency in Hertz/cycles per second(5763HZ./5.76Khz). The reverse is freq in hertz X 60, divided by 133 for RPM… That RPM determines top speed and if the linkage is mis-adjusted or the engine is not reaching fully governed RPM then there is your top speed limitation…
The engine has a throttle position sensor on top, right above the primary fuel filter/primer. That TPS sensor is hooked to the throttle linkage at the governor and is solely for the trans controller to use to help determine a shifting scheme. If the throttle pedal to governor is out of wack, then this is also out of wack. IE, the governor and TPS being low, the trans thinks you are cruising so doesn’t want to upshift Untill it hits a high limit RPM for a given gear.
Even if the pedal to governor linkage is correct and the engine reaches full governed RPM, if the TPS is out of wack, it still may not predict a shift and wait till max RPM for the current gear is reached before shifting. If the throttle linkage and governed RPM is OK, you can reset the TPS. You also need to check for any stored transmission fault codes. press up and down arrows simultaneously to reach code/diag mode which will display D1 and either dashes(no code) or a pair of numbers Will be displayed. Press mode to step thru 5 memory positions D1-D5 And record the numbers for all 5 locations. Switch off or press both arrow buttons to exit. Press and hold both arrow buttons for 10 seconds to clear stored codes…
To recalibrate the TPS and relearn the shift points do the following:
start the truck and drive it till fully warmed up.
stop the truck and shutdown. Then turn the main switch on untill the trans display appears, then turn the switch off. Do a total of 5 complete power-on to power off cycles. This clears the TPS info and the stored shift information. Switch the main switch on for the 6th time and once you have a display on the trans controller, depress and release the pedal once or twice to set new min and max TPS throttle positions. Press the start button and go drive the truck for a while thru all the gears to allow the trans to relearn it’s shift points.
of course this won’t work right unless you first confirm that the pedal givs full governed linkage position and that full governed is at the correct RPM…
