If you are looking for a mystery then this is it, I have been trying to figure out the source of this issue for 2 years now with even JD themselves left baffeled....
I have a JD 7130 that has air behind forced into the cooling system, not exhaust, not fuel mix.....air, First of all there reverse is not true there is no coolant going into any system it should not be which seems impossible but is what is happening. This has an intercooler/heat exhanger so I frist bypassed that and it did not change the issue, I bypassed the pump for the secondary cooling system for a temporary electric pump which did not stop the air but the lower flow and less force behind the return coolant on the secondary system allows the air to get out without taking my coolant with it. ( secondary system shoots a jet of coolant into the overflow/resivoir. This issue does not happen when the engine first starts up it seems to only start once the thermostat opens so whatever is making the pressure is enough to make the coloant tank pressure relief constantly chirp air but not enough to push past a closed thermostat and not enough to build up pressure causing a big surge of air at thermostat opening.
I am so out of ideas the tractor is sitting up there right now and the system is holding this pressure in the cooling system it does not leak back out. How can air be getting in but water not go back out once the source of pressurized air is gone? At one point I was thinking maybe the bottom right main cooling pump was somehow getting sump pressure but I put my finger in the crank vent and let it build a tiny bit but there was no change in the pressure in the cooling system.
Is it possible for the head gasket to have a bad spot in a way that intake air can get to the coolant system but not exhaust and the coolant can't go backwards through the same spot? is there something in the heating system that could generate air pressure when malfunctioning?
Im starting to think someone in the night took apart my block and hid an air compressor inside the engine to try and dry me crazy haha.......
Also thoes saying well it's gotta be the head gasket.... chemical test is negative every time and it's ran for 1000 hours since this issue started plus holds pressure in a leak down test.
I can ignore it and am still using the tractor on this lower flow secondary pump.... I lose coolant at a slower rate with it.
Just for clarify this engine has 3 water pump. One behind the fan for the secondary cooling system, one on the bottom right of the engine and one on the top left of the engine.
I have a JD 7130 that has air behind forced into the cooling system, not exhaust, not fuel mix.....air, First of all there reverse is not true there is no coolant going into any system it should not be which seems impossible but is what is happening. This has an intercooler/heat exhanger so I frist bypassed that and it did not change the issue, I bypassed the pump for the secondary cooling system for a temporary electric pump which did not stop the air but the lower flow and less force behind the return coolant on the secondary system allows the air to get out without taking my coolant with it. ( secondary system shoots a jet of coolant into the overflow/resivoir. This issue does not happen when the engine first starts up it seems to only start once the thermostat opens so whatever is making the pressure is enough to make the coloant tank pressure relief constantly chirp air but not enough to push past a closed thermostat and not enough to build up pressure causing a big surge of air at thermostat opening.
I am so out of ideas the tractor is sitting up there right now and the system is holding this pressure in the cooling system it does not leak back out. How can air be getting in but water not go back out once the source of pressurized air is gone? At one point I was thinking maybe the bottom right main cooling pump was somehow getting sump pressure but I put my finger in the crank vent and let it build a tiny bit but there was no change in the pressure in the cooling system.
Is it possible for the head gasket to have a bad spot in a way that intake air can get to the coolant system but not exhaust and the coolant can't go backwards through the same spot? is there something in the heating system that could generate air pressure when malfunctioning?
Im starting to think someone in the night took apart my block and hid an air compressor inside the engine to try and dry me crazy haha.......
Also thoes saying well it's gotta be the head gasket.... chemical test is negative every time and it's ran for 1000 hours since this issue started plus holds pressure in a leak down test.
I can ignore it and am still using the tractor on this lower flow secondary pump.... I lose coolant at a slower rate with it.
Just for clarify this engine has 3 water pump. One behind the fan for the secondary cooling system, one on the bottom right of the engine and one on the top left of the engine.
