warm up

[Hoobie]

This is from a B7800 manual:
View attachment 694640

Chrystal clear.

 

[hube2]

Like most things in most manual, this is as clear as mud. Does this mean let it idle, do not to hard work, what exactly defines warm up?

I think it's pretty clear. Warm for this minimum time and 50% rated rpm and then go to work.

What I don't like is the inconsistency, the times in my book for a different brand are double those.

"

 

[diesel85]

There are many reasons why it could be double the amount of time. There could be inline coolers, twice the amount of fluid, etc.

 

[RalphVa]

Just work it gently, without lugging it. That will warm it up better than sitting idling.

 

[hube2]

I don't know about anyone else, but I can tell by the sound my tractor makes when the HST oil is warmed up. This past winter there were a few mornings that I was in a hurry so after starting it up I would back it out of the shed far enough to allow working the FEL to help warm up the fluid. When the oil is cold the HST whine is louder and of a different pitch than when it has warmed up. The change is also noticeable to a lesser degree if I push on the peddles without having it in gear, something else I do to help warm up the fluid when it is extremely cold outside.

This is one of the reasons that I don't particularly care to wear hearing protection and I'll probably end up paying for this in the long run, but the sounds my machine make tell me a lot about how it's running and what it needs. The sound of the whine also tells me things like when I'm pushing the machine too hard climbing a hill and I need to ease up on the peddle.

 

[Buggs67]

My BIL and I were discussing this two days ago. I was at his house, he got on his LS turned the key, started it and started driving. I asked if he warmed up the glow plugs; he said it didn't seem to need it.

I always wait for the glow plug light to go out when the engine is cold. And I let it warm u for a few minutes while I gather tools, drinks, gloves, etal. I had also read somewhere (TBN prob) that engaging the rear PTO will warm up the hydraulic fluid faster so I do this in cold weather.

Maybe I'm babying it but I don't see any harm in warming it up.

 

[LittleBill21]

I came to the realization when its 30 degree's my hst does not warm up idling.i had my tractor at 1500 for 45 minutes while trying to figure out what i was going to use to catch the oil, when i dumped it, it was cold. I drive my tractor out 30 seconds after starting, other then the engine crackling a bit louder, i see no difference, I do get a bit more performance when warm in high with the HST though

 

[sportscarclinic]

I'm curious how long ago that section of the owners manual was written? Modern oils leave a film that lubricates well even on a "dry" start after the engine's been sitting for months. I suspect that this overly generalized recommendation is mostly to cover the worst case scenario, i.e., engine sitting unused for a year in an unheated barn in Alaska with summer weight oil in the sump (no such thing anymore of course). 5 minutes of idling won't hurt anything, but it's seriously excessive under most conditions. The weight of the oil in the sump and ambient temperature are big factors. The lighter the oil you run and the warmer it is outside, the less warm-up time you need before the engine is fully lubricated. Unless you live somewhere where the temperature doesn't change, one set time won't cover every start.

 

[Bob Rooks]

Just start and use. Do this with the tractor, pickup, cars all my 63 years of driving except for maybe a couple years of stupidity where I'd let them sit and warm up first.

Poster guy for the demographic. Never heard of thermal equilibrium and why it is important. Or maybe just have your post backwards - I've done that before.

Dog bless 'murca.

 

[5030]

Summertime no, by the time I drive out of the barn, the temp gauge is moving. Wintertime, yeas but not at base idle. I always kick them up to about 1000 rpm and let them warm up while I go in and have a cup of hot Joe.

When I shut them down, I always idle them for a few minutes to let the turbochargers cool down. Must be right, 6000 hours on one, 3500 on the other. Never had an engine issue.

I use them HARD, especially in the winter. Blowing and plowing snow makes them work and work hard.

 

[Tony H]

I look at it like this... Diesels run higher compression then gas engines. Engine Block and Head have gasket between them so Block with heat and expand before the Head. You don't want to put increased stain on these two components while they are warming up and expanding at different rates. To say nothing of other components that will heat up at different rates.

 

[GoatHerd]

I warm up my tractor engine for 4 or 5 minutes before moving an inch. Longer in cold weather. You can hear the engine start to hum more rapidly and smoothly (and ping) when it's reasonably warmed up. I also let the engine cool down for a couple of minutes after use, before turning the machine off. Not sure if I have to do that, but the manual says to do so. Warming your machine up will help it last longer (less wear).

 

[PILOON]

Just work it gently, without lugging it. That will warm it up better than sitting idling.

I agree.
With all the gear reduction I always figured that simply driving slowly was probably the same engine loading as idling.
Note however that I don't engage any PTO equipment nor use my FEL.

In winter my block heater is efficient to the point that I actually get warm air from the heater right at start up so I apply the same logic.
LOL, window fogging is my bigger indicator.

 

[5030]

Never used a block heater up here in the frozen north. No electricity in the barn and both mine have glow plugs and they work fine. Start and warm up an about 1000 rpm for a while (cup of coffee a while) and good to go. When the heater is blowing warm air in the cabs, I'm good. Change my starting batteries every 4 years and make sure the connections are clean and corrosion free.

 

[CobyRupert]

I can see wanting to warm the hydraulic oil for a hydrostatic tractor.
On cold days, I sometimes turn my PTO on, with no load, to get hydraulic oil warming. I doubt that it heats much just turning the PTO shaft. Some people turn the steering until it goes into relief. Oil running through a relief valve heats up considerably.

To me, idling an diesel when started seems like a poor way to warm up the engine. A diesel has no throttle plate, so you’re sending the maximum amount of cold air into the engine with the least amount of fuel. Compression will warm some, but not most effective.
By putting a load on the engine (by moving and starting work) you’re at least putting more fuel (and heat) in the engine at a given rpm (air flow).

It really depends on what you mean by cold. At 30F engine oil and coolant may start to warm at idle, but at -10F, results may vary.

I start tractor, let it fast idle for a minute or two, then slowly putter out of the barn, all the while slowly bring up rpms.
IMHO, it’s important to me for the engine to heat up slowly so that expanding metal parts adjust to each other slowly.

 

[RalphVa]

When we had diesel cars for 37 years, if you started them with snow on the hood, you could let them sit there and idle forever, and the snow would likely never melt from the hood. Not much heat is given off from an idling diesel engine. Not a good thing to do.

If you're starting a diesel HST in cold weather, you'd be better off using a space heater or some other form of underneath heater to heat up the HST area before moving out rather than let it sit and idle.

Really a silly idea to warm up a diesel or HST by letting it sit and idle.

 

[5030]

When we had diesel cars for 37 years, if you started them with snow on the hood, you could let them sit there and idle forever, and the snow would likely never melt from the hood. Not much heat is given off from an idling diesel engine. Not a good thing to do.

If you're starting a diesel HST in cold weather, you'd be better off using a space heater or some other form of underneath heater to heat up the HST area before moving out rather than let it sit and idle.

Really a silly idea to warm up a diesel or HST by letting it sit and idle.

What a goofy statement.

Really, I don't think you are even close to correct. Not idle, bumped up a few hundred rpm. Guess if diesels were meant to not warm up, the stationary diesel powered gen sets would not have a warm up cycle before assuming a load.
They all do, including the one I own.

Bottom line is, it's my equipment and it cost many thousands of dollars and I'll always warm it up before using it, don't much care what your opinion is on that score.

Opinions are like butt holes, everyone has one, some stink however. In this instance, your stinks real bad..

 

[RalphVa]

Our Isuzu diesel has no warmup. There's a few seconds of cool down.

 

[5030]

Turbo charged or naturally aspirated?

 

[RalphVa]

Our Isuzu is naturally aspirated.