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Generation 2 Pajero NH - NL Models 1991 - 2000

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Old 05-12-17
78shane 78shane is offline
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Default 2.8l running hot

Hi guys my 2.8l has started to run hot, not overheating just sitting under half way when it has always sat just above cold, ok so here is the story, on the weekend I ran out of diesel, i know stupid but anyhow got fuel still running like dream, but i have had this annoying leak for quite some time now so decided to remove all bash plates and spray with degreaser so i could get a better look did this started her up and immediately started weepi g from behind harmonic balancer, ok so now i know where leak is decided to leavr bash plates off tilk i have time to fix and now its running hot the only ever time it has ever run this hot is when towing the boat up long hills, could the bash plates off be causing this as i would have thought it have more air or should i try a radiator flush
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Old 06-12-17
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TimTams TimTams is offline
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gauge should be sitting half way... if not, either the gauge or sender (usually sender) is faulty and it's probably not running hot at all. I'd sort that out first. Mine sits about a mm under half way at all times
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Old 06-12-17
78shane 78shane is offline
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I dont know the gauge has seemed to work since i have had the car could it be that running out of fuel has caused shit to block the injectors and now its running lean

Last edited by 78shane; 06-12-17 at 12:32 PM.
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Old 06-12-17
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bilgeboy bilgeboy is offline
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Quote:
Originally Posted by TimTams View Post
gauge should be sitting half way... if not, either the gauge or sender (usually sender) is faulty and it's probably not running hot at all. I'd sort that out first. Mine sits about a mm under half way at all times
X2 and I'm on my second motor.
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Old 06-12-17
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Originally Posted by 78shane View Post
I dont know the gauge has seemed to work since i have had the car could it be that running out of fuel has caused shit to block the injectors and now its running lean
i would be confirming 100% whether your engine is actually running hot or not. If it was overheating, it probably would have stopped due to a cracked head. Ten bucks says your gauge has been playing up, or your thermostat was stuck open. Mine sits a mm or two below the centre normally and never moves from that spot

if the injectors were blocked it would manifest as a miss or hesitation. diesels can't run lean, less fuel just equals less power
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Old 06-12-17
78shane 78shane is offline
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Ok cool maybe i have unstuck the sensor while cleaning ill keep an eye on it
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Old 09-12-17
pharb pharb is offline
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Originally Posted by 78shane View Post
I dont know the gauge has seemed to work since i have had the car could it be that running out of fuel has caused shit to block the injectors and now its running lean
Diesels run cooler when lean, hot when overfueled. Although that is a very simplistic statement. They are an excess air motor, meaning the engine will always take in as much air as it physically can and the engine's output is regulated by varying the available fuel. At light throttle the engine runs lean, at full throttle the engine runs rich.

A petrol engine's output is controlled by regulating the amount of air entering the engine by manipulating the throttle butterfly. The ecm then measures airflow or volume and injects a suitable amount of fuel to keep the air/fuel ratio right.

My old 4m40 NJ always sat with temp needle just below horizontal, except for onece when I saw it heading upwards very quickly. By the time I had pulled up it had pumped a heap of coolant out. A bit more to the story but that is the only time it has varied in nearly 500,000km.
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Old 11-12-17
als008 als008 is offline
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Like TIMTAMS said.... mine also sits just under the Half mark. Ive never seen it go over that.
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Old 15-01-18
ThunderPie ThunderPie is offline
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one reason for overheating could be a clocked waterpump if water and not a proper cooling fluid was been used.

also rust clocks up the radiator and the therostat over time when water was used.

flushing the radiator with lots of fresh water and replace water pump plus thermostat might fix that problem.

I had the same issue on my last motor, ended up with a blown head during towing a boat

now the temp gauge is always in the middle and my madman moniter says water temp. 74deg most of he time.

I also changed to a large front mount intercooler which helps a lot to keep the engine temp. down
EGT is mostly 360deg C on standard fuel pump setting.

intake temp. of the air after intercooler is below 80deg C.
I alway can touch the pipe which goes into the intake manifold even after a long ride with my bare hand.
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Old 16-01-18
erad erad is offline
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The bash plate comes in 2 pieces. The front piece covers as far as the radiator. By removing this piece, you are allowing the fan to short circuit and draw air from under the car instead of pulling it through the radiator core. Put that plate back on and you should be OK, providing nothing else is failing eg the viscous clutch in the fan couplling or some blockage in the cooling system innards.
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