Diesel warm up

Reving any sort of cold engine is detrimental

Hi, I think you will find it would be better to start the car and drive it gently untill it warms up.
Wll

My great hate in camp sites - people idling their engines to warm them up. Not only does the process put fumes all over the camp site, but it also puts acid in the oil.

The need to warm up engines disappeared about WW2 when selective fit systems were devised for all engine asssemblies; and with modern machining processes unpredictable clearances simply do not exist.

Further, if your engine is a bit warm you are tempted to drive fast from go, leaving gearboxes, diffs and wheel bearaings all running without the oil/ grease having a chance to warm up. Wrecks the car faster.

Diesel owners who are patient should turn the ignition on before putting their seat belt on. Then start the engine - the extra time for the glow plugs to operate helps to start easier and reduce smoke. You get 90 seconds of glow plug operation (even thought the little light goes off after a few seconds), and that does much more good than running at idle.

So - let the glow plug heat for perhaps 20 seconds, start the motor then drive off gently till the engine temperature comes up. By then the whole car will be warmed up.

But if your neighbour has to rev the engine - it probably needs some work done on it.

Max

I like to see the temp guage needle move off the bottom of the guage before moving off by letting it sit on idle.
But then I live at the top of a hill so the first kilometre or so is down hill and I am not loading the engine up either.
Always like to take it slow and steady until the engine is well warmed, and the gearbox starting to warm up.

My 2.8l diesel pajero has the oil cooler in the side of the block in the water jacket, so I assume that the water when warm would help warm the oil a bit faster too. The oil cooler used to be external on earlier models, but not sure if they had a thermostat in the oil system.

Oil is Penrite 20/60 hpr diesel, so very conscious of the 20 and 60 figure, since it will be 20w at cold and when warm at 70deg c - 60w. So I imagine it also depends a little on the oil being used.

Best bet is to let it warm a little, heat will change the viscosity of the oil - and allow times for all oil galleries to becomes flooded with oil - NEVER rev a cold motor or drive it hard as you will cause premature wear AND OR damage to your rings / cylinder wall due to lack of lubrication

cold mornings -- start - jump out - wet windscreen to get rid of morning mist - lock front door -- then jump in and drive away -- usually takes a few min - and enough time for all working parts to become warmer and lubricated

Frank

For your answer you need look no further than your freindly owners manuel
"Engine should be warmed up by driving, not on idle. For warming up, drive with smoothly turning engine until coolant tem is within normal range" Unquote. Not my opinion but Toyotas on how to warm up a cruiser

TO ALL diesel users;; I dont have to worry about fumes when I start my 80srs cold because there are NONE and its done over 450000klms,and to boot it starts first compression,you will all learn one day.

From you all know who

Davo you have the auspicious position of being that one in the crowd,theres allways one,as stated all will learn one day,

Happy motoring BS

My little 3l TD patrol has a "heat" button that puts up the revs in order to warm things up. Hardly a rev tho. It turns off once you put it in gear.

Also, since having a dtronic fitted, it seems to get off to smoother starts.

Doesn't idling a diesel with no load cause glazing of the motor. Besides that why waste fuel when you can start up and drive away sedately for the first few minute.

Bob Cheers

Well, I'm sitting in my Jackaroo with the laptop at the moment, thought I'd see what type of fumes my Jackaroo TD puts out when cold. Started it up about 12.00 a.m., pipe in through the window from the exhaust, its now 12.05 a.m. and nothing, hang on...... wait a minute......feeling abit dizzy but that could just be because I'm tired, no feeling a bit sick now,, ooh what's that pain in my chest......aaaaaaaarrrrrrrggggggg

During my time with GM Research we did a huge amount of work on quantifying this one!

Truly - the very best way is to drive away at slow revs under a light load the very moment oil pressure is established. The worst way (but one) is to let the thing warm up off-load - the very worst is as that except also revving it hard.

Engines need to run hot to burn off acid build-up. Thus do not even think of removing the thermostat except as an emergency action.
Collyn Rivers

You know whats great about this site, so many people with so many different opinions. If only we knew which ones are right or wrong? lol

With my diesels if weather warm and driving no load dont normaly warm up.
If cold sometimes warm up for minute or two.
if cold and towing caravan normaly warm up for minute or two.
cheers
Charlie