Slow to warm up

[Nab]

Add me to the list of slow learners, err, warmers...

[Ben470]

Just to give you my 5 cents worth, my 2007 NS DiD takes 15 minutes to warm up on a cold day, 10 minutes at absolute best, replaced thermostat with Daycos DT57e (there were several options apparently this is the right one?) And same deal, no changes.
Only noteworthy item is that radiator fan runs constantly from start up?
Cheers,

[Moci]

Just to give you my 5 cents worth, my 2007 NS DiD takes 15 minutes to warm up on a cold day, 10 minutes at absolute best, replaced thermostat with Daycos DT57e (there were several options apparently this is the right one?) And same deal, no changes.
Only noteworthy item is that radiator fan runs constantly from start up?
Cheers,

I wanted to try with new thermostat but now I see that all 3.2 DiD are so hard to warm up, so perhaps it's normal.
My radiator fan also runs constantly, and in winter I put board (cover) in front of radiator for winter driving but I got the same result.
In the city in winter it's very hard to warm up, but on the open road results are better.

Cheers

[basil]

When the mornings are freezing cold in early spring, I too am in the 10 minute bracket to warm up, in fact even when the temp gauge starts to move, if I then go down long decents with little or no throttle, it will actually drop a bit until I put the boot into it again. This is normal for me year in year out.
There is a certain temp that once it is below that with moist air in the mix, it struggles to get up to temp until medium throttle is used.
If I go another way to work were I have to use lots of throttle straight away, then it gets up to temp quickly. I live in the hills by the way which probably magnifies this affect a bit.

Cheers,

[Ben470]

Yeah right, well after hunting around for the right thermostat (this was not easy for the 2007 NS, no auto shop could tell me the correct product to use) I ended up buying Dayco's DT57e (stamped to open at 77 degrees C). Happy (...and sad) to report that the engine warms up still in around 10-12 minutes when nursing it up to temp.

You can go for several brands and options for thermostats in the NS, can anyone confirm for me that the DT57e is actually a valid product for the 2007 NS DiD Pajero?

Another thing that has me confused is the difference between the 4m41-u and 4m41-T. I can't for the life of me work out which motor I have - I know that's stupid, but it doesn't seem to be written anywhere on the manual, service book, engine bay or engine itself.

Just a hint, if pulling out the thermostat on these cars (unlike many other cars) you won'ty just loose a trickly of coolant, you'll drop at least 50% so would recommend having loads of spare coolant on hand. I'm using Penrite's 7-year long life green and flushing it soon.

Ben

[aussieintas]

I remember reading somewhere some time ago the T is the 125kms output engine say in the NS and the U is the engine with 147kws as in the NT and onwards. In short its the same motor just different turbo.

It was some time ago and I'll be happy to be corrected

[Ben470]

Yeah right, okay... I keep hearing about the NS being a 4m41T so I'm going with the Dayco DT57e. Fingers crossed.
Cheers,

[aussieintas]

That is the correct thermostat bud. The tech manual stats thermostat valve opening temperature is 76.5 +-2 so all good.

Just my thoughts for everyone. My NS takes around 10 to 12 minutes of normal driving for the temp gauge to show at normal temp. Warm air starts to come from the vents probably within a few mins. I think this is quite normal for a vehicle nowadays and am not concerned at all.

As others have said it takes time for the enginge to warm up and then show on the guage. Remember the temp gauge is showing the temp of coolant not the enginge itself. Takes a bit of time for the metal and oils to warm up and then the coolant to do its thing and remove the heat from around the block and all the passages etc.

Every vehicle I've had over 35 years is about the same in terms of warm up time.

[Ben470]

That is the correct thermostat bud. The tech manual stats thermostat valve opening temperature is 76.5 +-2 so all good.

Just my thoughts for everyone. My NS takes around 10 to 12 minutes of normal driving for the temp gauge to show at normal temp. Warm air starts to come from the vents probably within a few mins. I think this is quite normal for a vehicle nowadays and am not concerned at all.

As others have said it takes time for the enginge to warm up and then show on the guage. Remember the temp gauge is showing the temp of coolant not the enginge itself. Takes a bit of time for the metal and oils to warm up and then the coolant to do its thing and remove the heat from around the block and all the passages etc.

Every vehicle I've had over 35 years is about the same in terms of warm up time.

Ayee, someone who knows four technicians and a mechanic
Could not give me that answer. Wrapped.
Sadly as an update the torque wrench was faulty and ended up snapping a bolt in the thermostat housing so again I'm in the sticky.
Thanks for the above, a good point about the coolant. I feel silly not thinking about that myself.
Cheers,
Ben

[El_Freddo]

I'm not sure what the connection is with the engine being turbo charged and taking longer to warm up.... In my opinion it's irrelevant.

The reason the diesel takes longer to warm up than an equivalent petrol engine is because the diesel block is one big lump of metal you're trying to heat up - hence it takes longer.

Also the fact that diesel is more efficient in putting power into motion rather than heat when compared to that of petrol. I can’t remember exact figures, but I think petrol is something like 23% efficient and diesel 70% or there abouts. The rest is lost in heat. Basically this means a petrol engine will always warm up quicker than a diesel engine in the same conditions.

Cheers

Bennie

[haz77]

You cant compare petrol & diesel warm up times,,,

My Paj Diesel also takes a good 10mins to get warm, my Toyota Hilux diesel is getting warm before I reach the end of the drive!

[erad]

A lot depends on the ambient temperature at the time of startup. I live in a cold climate and in winter, it takes at least 20 km of driving at highway speed before the Scangauge tells me the cooling water temperature has reached 86 Deg C. Last week I was in Queensland and it was HOT - over 30 Deg C before we left our caravan, but it only took about 4 km before the temp reached 86 Deg C.

[Kingmarz]

I’ve just upgraded to a NM Pajero 4m41 from a Challenger 4m40 and can honestly say the 4m41 takes about 5-10 longer to worm up and my 4m40 is just the same as any other car which makes me wonder why as they’re apparently the same block? Bigger water passages in 4m41 head to prevent previous generation head cracking issues? Better thermal efficiency with DID?