Hi all, noob here that needs some help.
I suspect that my 1996 D21 Navara 2.7 has a Terrano engine but I am not sure how to identify it from a NA 2.7 with an aftermarket turbo.
One of the reasons I suspect this is that it has a sensor on the thermostat housing that does not have a corresponding plug in the loom but could be from a different model I guess.
While some of the turbo components appear factory, some are definately homemade.
My problem is that when driving on the highway at 100-110kph the car runs great until I have a hill to contend with, then the temp climbs to above 3/4 on the gauge, then as I go downhill again, the temp returns to just below half on the gauge and stays this way until I get to another hill.
It is not using any water, and only heats up when under load on hills, at all other times it behaves flawlessly.
I have checked the radiator for blockages and water runs freely though it, then checked the thermostat in boiling water and it opens, but didnt have a temp gauge to test the temperature, the shroud is in good nick, nothing is blocking the radiator, the belts are tensioned but I havent checked the viscous coupling since I thought at that speed it would be having almost no effect anyway. My next step is to check the water pump, since the corrosion in the thermostat housing could be a clue as to the condition of the water pump impeller.
What I have noticed is that the bottom flange of the thermostat acts a bypass to ensure that all the coolant goes to the radiator instead of circulating around the block and has a corresponding sealing surface inside the thermostat housing once the thermostat is open, this sealing surface is pitted and I am not sure what effect this has on the operation of the cooling system but I suspect not a positive one.
Is this a common TD27 problem?
Any help is appreciated and any photos of the two engines would be a great help.
I suspect that my 1996 D21 Navara 2.7 has a Terrano engine but I am not sure how to identify it from a NA 2.7 with an aftermarket turbo.
One of the reasons I suspect this is that it has a sensor on the thermostat housing that does not have a corresponding plug in the loom but could be from a different model I guess.
While some of the turbo components appear factory, some are definately homemade.
My problem is that when driving on the highway at 100-110kph the car runs great until I have a hill to contend with, then the temp climbs to above 3/4 on the gauge, then as I go downhill again, the temp returns to just below half on the gauge and stays this way until I get to another hill.
It is not using any water, and only heats up when under load on hills, at all other times it behaves flawlessly.
I have checked the radiator for blockages and water runs freely though it, then checked the thermostat in boiling water and it opens, but didnt have a temp gauge to test the temperature, the shroud is in good nick, nothing is blocking the radiator, the belts are tensioned but I havent checked the viscous coupling since I thought at that speed it would be having almost no effect anyway. My next step is to check the water pump, since the corrosion in the thermostat housing could be a clue as to the condition of the water pump impeller.
What I have noticed is that the bottom flange of the thermostat acts a bypass to ensure that all the coolant goes to the radiator instead of circulating around the block and has a corresponding sealing surface inside the thermostat housing once the thermostat is open, this sealing surface is pitted and I am not sure what effect this has on the operation of the cooling system but I suspect not a positive one.
Is this a common TD27 problem?
Any help is appreciated and any photos of the two engines would be a great help.