diesel warmup? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 12 (permalink) Old 05-10-2010, 04:35 AM Thread Starter
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diesel warmup?

hey guys,

my dad and i am currently in a heated battle. lol. he says i dont need to warm up my truck in the morning before driving to work.

is this an ideal process? or am i just wasting fuel?

thanks
erik

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post #2 of 12 (permalink) Old 05-10-2010, 04:56 AM
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Your wasting fuel. Just start it, wait until you have oil pressure, then drive. If you idle the engine to warm it, the rest of the drive train is still cold and stiff when the engine is ready to go, plus the wasting fuel part...

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post #3 of 12 (permalink) Old 05-10-2010, 05:04 AM
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Wasting fuel, once it has full oil pressure the best warm up is a 20-30% load. An exhaust brake will do the same as driving very gently.

If you are next to the get on ramp and the traffic is fast, a trip around the block is better than idling 5 min.

I think that a cold start is about the same as a 100 mile run, whether it is to move into the garage or run all day for another 800 miles. I lived for a while where a loaf of bread was 70 miles and no traffic, another place the get on ramp was 2 blocks, the traffic heavy and getting in line took 80 mph min - worriesome with the choke on.

Cold idle is the worst wear condition for a diesel - not enough pressure behind the top ring to seal properly and the cylinder wall will not evaporate any fuel on the cylinder wall so it washes down into the engine oil, somewhere 1000 - 1200 rpm the pressure seals the upper ring.

The warm up comes from engine designs out of production over 60 years

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Last edited by keydl; 05-10-2010 at 05:07 AM.
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post #4 of 12 (permalink) Old 05-10-2010, 01:28 PM Thread Starter
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Originally Posted by keydl View Post
Wasting fuel, once it has full oil pressure the best warm up is a 20-30% load. An exhaust brake will do the same as driving very gently.

If you are next to the get on ramp and the traffic is fast, a trip around the block is better than idling 5 min.

I think that a cold start is about the same as a 100 mile run, whether it is to move into the garage or run all day for another 800 miles. I lived for a while where a loaf of bread was 70 miles and no traffic, another place the get on ramp was 2 blocks, the traffic heavy and getting in line took 80 mph min - worriesome with the choke on.

Cold idle is the worst wear condition for a diesel - not enough pressure behind the top ring to seal properly and the cylinder wall will not evaporate any fuel on the cylinder wall so it washes down into the engine oil, somewhere 1000 - 1200 rpm the pressure seals the upper ring.

The warm up comes from engine designs out of production over 60 years

even in extreme cold i shouldnt idle it for at least 5 mins? i live in illinois and it gets kind of cold here.

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post #5 of 12 (permalink) Old 05-10-2010, 05:11 PM
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Quote:
Originally Posted by ehopp88ss View Post
even in extreme cold i shouldnt idle it for at least 5 mins? i live in illinois and it gets kind of cold here.
Correct. Just start it up, and once you have oil pressure, drive it gently at first, then like normal.

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post #6 of 12 (permalink) Old 05-10-2010, 05:27 PM
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One thing I learned living in Alberta is to start an engine when it is real cold crank it for 10 seconds wait for 60 seconds and it will start. To warm it up quickly run it at low idle for 30 seconds then at 1000 for 90 seconds, low idle for 10 then shut it down for 60 seconds that allows the heat in the exhaust, to go into the cylinder head and when you restart it is amazing the difference in tempature. Then you should be good to go as was mentioned progressive shift and I was always taught to give it a surge in reverse first. I use to stay in a low gear for a while to be sure everything is lubed up. Just a thought!

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post #7 of 12 (permalink) Old 05-11-2010, 02:29 AM
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For the most part i let it go for 5 min, then gentaly go till its up to full operating temp. Might be wasting alittle fuel but i know oil got everywere before taking off.

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When the oil pressure is up to normal it is time to raise the engine speed to 1k rpm to see that the oil will flow if it is COLD - I started one at -30 and the oil would not build pressure in the normal 30 seconds. I shut down and got a salamander to point at the pan, 20 min and the oil pressure came up, 2 min to build air and the transmission would not shift into gear. Just about an hour late it worked normal. It was a truck that I picked up from auction in S Texas and that afternoon the engine and all gear boxes were changed for winter oil, next day -no problem.

Part of the maintenance is knowing that the seasonal maint is current, it is more comfortable to go back in the warm for an hour while the engine warms but it costs money in fuel, wear, and extra maint labor. The only diesel that I ever 'warmed' was an NTC in a Transtar that leaked all the air in 6 hours, the compressor was slow starting so the first tank of air for the day took 20 min unless it was cold, in the low 20's it took 40 min to get 70 #. After that it worked normal so I did not take much apart to find the problem.

Cranking for 10 - 15 seconds warms the batteries chemicaly, warm batteries work better.

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post #9 of 12 (permalink) Old 05-11-2010, 09:15 AM
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I've never thought that a little bit of warm up time was a bad thing. 2-5 minutes when its really cold for the oil temps to come and up the truck to smooth out a bit.

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post #10 of 12 (permalink) Old 05-12-2010, 05:14 AM
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There is no doubt that heading into traffic with an engine stumbling along on 3-4 cylinders is just not an excellent plan. That was the point of taking the long route to the on ramp, if that is your current situation. Mine is 4 miles to the pavement, where there is a little traffic, it was not always that way for me, either for my personal transportation or the 3 window office.

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