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If you decide to remove the turbo, I can post a rough outline of the factory-recommended procedure, accompanied by some drawings. There is also a set of recommended precautions to be aware of.
If you decide to remove the turbo, I can post a rough outline of the factory-recommended procedure, accompanied by some drawings. There is also a set of recommended precautions to be aware of.
If you have a manual or docs on replacing it please share!
@Thearc You need to determine if the engine is still serviceable or not. If serious damage had occurred, you'll be looking to replace/remove the engine which will make trouble shooting/replacing the turbo much easier. My bad for forgetting that the NX has separate cooling systems as nOv8or had pointed out in his post.
As you had observed, the turbo's seal(s) was(were) leaking coolant. Also coolant was leaking from hole in turbo. Hole and seal(s) are one and the same ?
Regardless, the turbo is compromised. However, the priority is still to determine engine health and then go from there.
When engine was cranked, a noticeable spray of liquid ( I'm assuming it's coolant and not fuel ). With second crank, spray and (mist and/or smoke) along with it. If you concur with this observation and my best guess is that the head gasket is blown allowing small amount of coolant to leak ( not too copious a volume to hydro-lock the cylinder(s)) into one or more cylinders. Upon cranking said coolant were then expelled forcefully to turbo unit. There is obviously a leak somewhere between engine and turbo. Best guess would be the head gasket again.
If its really smoke i.e. exhaust fumes that were in the video, it could indicate one or more cylinders were firing. A check of the spark plugs would give you relevant insight.
If you a small mirror handy , see if you can locate the source of the coolant leak.
You also mentioned a leak at the turbo and found two detached 11mm bolts. The coolant and oil inlet & outlet for the turbo are gasket & flange connections and are attached to turbo body by two bolts per. Check both flange connections for missing bolts. May put to rest this bit of mystery.
When engine was cranked, a noticeable spray of liquid ( I'm assuming it's coolant and not fuel ). With second crank, spray and (mist and/or smoke) along with it. If you concur with this observation and my best guess is that the head gasket is blown allowing small amount of coolant to leak ( not too copious a volume to hydro-lock the cylinder(s)) into one or more cylinders. Upon cranking said coolant were then expelled forcefully to turbo unit. There is obviously a leak somewhere between engine and turbo. Best guess would be the head gasket again.
If its really smoke i.e. exhaust fumes that were in the video, it could indicate one or more cylinders were firing. A check of the spark plugs would give you relevant insight.
If you a small mirror handy , see if you can locate the source of the coolant leak.
You also mentioned a leak at the turbo and found two detached 11mm bolts. The coolant and oil inlet & outlet for the turbo are gasket & flange connections and are attached to turbo body by two bolts per. Check both flange connections for missing bolts. May put to rest this bit of mystery.
Might be the bolts or the seals but how could they fall off? I wish there was a diagram I could download to make sure. I don’t think it’s the head casket if I’m being honest.
My kids drove it when the water pump went out and starved the turbo right before engine almost overheated. Diagram of the turbo and engine would help confirm my suspicions.
The exhaust line to turbo inlet elbow obstructs access to the engine water pump and is usually removed for water pump replacement. However, it is fastened to the turbo with nuts and studs, not bolts. The engine water pump does mount with bolts (5 of them); I don't know what size they are.
I am not sure what drawing you are asking for. Attached is an overall turbo system drawing. Coolant lines are rendered in blue.
*1 ECM (engine control computer)
*2 Turbo/intercooler water pump (electric)
*3 Intercooler
*4 Turbo/intercooler radiator
*5 Air bypass valve
*6 Mass airflow meter
*7 Turbo
*8 Waste gate actuator
*9 Vacuum valve
*10 Vacuum pump
*11 Engine coolant temperature sensor
*12 Crankshaft position sensor
*13 Turbo pressure sensor #1
*14 Throttle body
*15 Turbo pressure sensor #2
The exhaust line to turbo inlet elbow obstructs access to the engine water pump and is usually removed for water pump replacement. However, it is fastened to the turbo with nuts and studs, not bolts. The engine water pump does mount with bolts (5 of them); I don't know what size they are.
I am not sure what drawing you are asking for. Attached is an overall turbo system drawing. Coolant lines are rendered in blue.
*1 ECM (engine control computer)
*2 Turbo/intercooler water pump (electric)
*3 Intercooler
*4 Turbo/intercooler radiator
*5 Air bypass valve
*6 Mass airflow meter
*7 Turbo
*8 Waste gate actuator
*9 Vacuum valve
*10 Vacuum pump
*11 Engine coolant temperature sensor
*12 Crankshaft position sensor
*13 Turbo pressure sensor #1
*14 Throttle body
*15 Turbo pressure sensor #2
Thank you for the diagram, very helpful. Car finally threw a CEL light and it’s for P0117 for engine coolant temp…Did finally find the two missing bolts and they were for the coolant reservoir housing…lazy *** mechanic didn’t want to put them on
The NX engine (8AR-FTS) section begins on page 16, and the Turbo section on Page 26. If you cannot see the images, open the PDF file with a browser (Firefox and Chrome work OK) instead of the Adobe PDF Reader.
03-28-24, 06:41 PM
