Y62 Operating temps

[hsbashraf]

I have a Y62 Nissan Patrol with the VK56DE (320hp) engine, GCC spec. Recently, I installed headers, a high-flow exhaust, and a new intake. After these modifications, I took the vehicle for a full tune-up, including a dyno tune with an ECU flash.

I was experiencing overcooling issues and found that my thermostat was damaged. I replaced it with an OEM 82°C thermostat. However, after the replacement, the engine temperature at idle or in traffic now rises to 98°C (with ambient temperatures between 18-28°C). The fan never produces a roaring sound, but the temperature drops slightly after reaching 98°C. On the highway, the engine runs at 89-90°C.

I replaced the fan clutch, but it made no difference. My tuner believes these temperatures are too high and are causing performance loss. I would like to know the normal operating temperature range for the VK56DE engine. Additionally,considering patrol fan is ECU controlled, should the fan behave like a typical viscous fan, roaring at startup and locking up as the engine reaches operating temperature? Currently, I can easily turn the fan by hand, even when the engine is at operating temperature.

For reference, during a dune bashing session, engine temperatures stayed around 90-95°C. Any insights or recommendations would be greatly appreciated.

[hsbashraf]

Any help people

[mudnut]

I have a Y62 Nissan Patrol with the VK56DE (320hp) engine, GCC spec. Recently, I installed headers, a high-flow exhaust, and a new intake. After these modifications, I took the vehicle for a full tune-up, including a dyno tune with an ECU flash.

I was experiencing overcooling issues and found that my thermostat was damaged. I replaced it with an OEM 82°C thermostat. However, after the replacement, the engine temperature at idle or in traffic now rises to 98°C (with ambient temperatures between 18-28°C). The fan never produces a roaring sound, but the temperature drops slightly after reaching 98°C. On the highway, the engine runs at 89-90°C.

I replaced the fan clutch, but it made no difference. My tuner believes these temperatures are too high and are causing performance loss. I would like to know the normal operating temperature range for the VK56DE engine. Additionally,considering patrol fan is ECU controlled, should the fan behave like a typical viscous fan, roaring at startup and locking up as the engine reaches operating temperature? Currently, I can easily turn the fan by hand, even when the engine is at operating temperature.

For reference, during a dune bashing session, engine temperatures stayed around 90-95°C. Any insights or recommendations would be greatly appreciated.

Welcome to the forum. Did you test the thermostat before installing it?

[hsbashraf]

Welcome to the forum. Did you test the thermostat before installing it?

Thank you for the response. I actually did not test it since it was new OEM part I considered it as good. Do you think this fan behavior is normal what i explained.

[Plasnart]

Did you see the request to put up an intro? This is not Facebook. You will get so much more detail if you just be a normal human.

[hsbashraf]

Did you see the request to put up an intro? This is not Facebook. You will get so much more detail if you just be a normal human.

What Intro?

[mudnut]

This link for intro. https://www.nissanpatrol.com.au/foru...-Introductions

Over the years I've had a couple of brand new thermostats fail. I hope a Y62 owner can answer your question.

[hsbashraf]

This link for intro. https://www.nissanpatrol.com.au/foru...-Introductions

Over the years I've had a couple of brand new thermostats fail. I hope a Y62 owner can answer your question.

Introduction done. Dont you think if thermostat is bad the fan should be roaring when engine is going above the set temps?

[PeeBee]

@MudRunnerTD, any thoughts after your performance upgrades?

[Plasnart]

Holy farrk.. headers done, new exhaust, intake changed, thermostat changed, fan clutch changed, now it’s misbehaving with temps. Why are people so shocked when their motor cracks the shits after being fucked around with? Why are you doing all this to a proven and reliable V8 grunt god? Keep it simple stupid. How many times do I have to say this? What are you trying to build?

Yes the VK56DE fan roars on startup. That is normal. Read your user manual as to the ECU engine startup sequencing, and don’t frig around with a proven donk (although I did put a nice cat-back exhaust on mine for the tunes!) lol