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Old 11-12-2013, 11:01 AM   #1
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Class A diesels

Just a curious question! I am a fifth wheel person, what I am curious about is why most people wih diesel pushers start their diesels 30 minutes b4 they are ready to leave. I am a Workamper and have always wondered about this but really don't want to ask people in the park as they may think I am complaining. Doesn't bother me just curious,
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Old 11-12-2013, 11:13 AM   #2
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I start mine about 4 mins before I leave just to air up the suspension. In cold weather, my owners manual advises to idle the engine until you see the temperature gauge move, at which time it's ok to leave.
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Old 11-12-2013, 11:17 AM   #3
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I start ours up just before we leave- slides in, jacks up and air up suspension and we are gone. 5 or so minutes max. it bothers my DW so she is glad we don't have to run it 30 minutes!
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Old 11-12-2013, 11:27 AM   #4
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The folks who start theirs up 30 mins before leaving, believe they are warming it up properly. I basically just let it run long enough to air up the suspension. If I am going to run it longer than that at idle I will kick up idle with speed control to 1000-1200 rpm.

My real warm up comes by idling out of the lot and slowly driving away. Its the same with those who feel they have to idle 3-5 minutes to cool down after extended driving.

Its a preference, but if someone feels they need to idle for 30 minutes, they should move it away from the rest of the campers. Its similar to second hand smoke.
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Old 11-12-2013, 11:46 AM   #5
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Old school mentality is to let idle or fast idle a long time for warm up. Cat and Cummins both recommend idle until air pressure is up and then move at low load and rpm to get your engine to operating temp.
As far as cool down. You really need to make sure your exhaust temp is down before you shut off. Idling through a camp ground should do it. Pulling into a fuel island from highway speeds especially on a hot day needs at least 2 to 4 minutes. It will save your turbo. I'm talking pre emotions engines here as I can't comment on the newer ones.
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Old 11-12-2013, 11:52 AM   #6
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I can't retract my slide in with the engine running. Also, you can't release the brakes until you have air over 65lbs.
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Old 11-12-2013, 12:13 PM   #7
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Quote:
Originally Posted by SMRDNR View Post
...I start ours up just before we leave- slides in, jacks up and air up suspension and we are gone. 5 or so minutes max....
Same here, when all the hoses/cables/cords are in and we are ready to leave, except for air, jacks and slides, I start it.
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Old 11-12-2013, 12:26 PM   #8
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Direct from Cummins:
Quote:
Idling at Startup or Shutdown

At Startup
– Idling for engine warm-up is not required
– Once oil pressure is seen … put motorhome in motion
– Don’t operate at full road speed until engine temp reaches approximately 150 deg.F.

At Shutdown … Idle (3-5 min) required only after full throttle/high power operation.

Idling is not necessary after normal operation such as exiting highway, driving into rest stop, campground, etc.
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Old 11-12-2013, 12:33 PM   #9
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I think when you state "30 min".... it may be a slight exaggeration. In all my years of rv'ing, I've never seen anyone do this. However, I have seen them idling 10 - 15 min....which is still somewhat unnecessary.

As far as I know...ALL DPs require bringing up the air pressure (for suspension and brakes) to at least 65 psi prior to releasing the parking brake. Also, to have full braking capability, a DP requires the pressure to be maximized...110 - 120 lbs.

It really doesn't take long to achieve these pressures...maybe five minutes at the most, but sometimes the drivers will allow them to idle a little longer to help raise the jacks and/or bring in the slides; hence, a 10 -15 idle time with the extra amps provided by the engine's alternator.

30 minutes is just being rude and inconsiderate of their neighbors and is detrimental to the coach it self.

Ron
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Old 11-12-2013, 12:45 PM   #10
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Agree with Davdeb1. They likely think it's good for thier motor, getting it up to full operating temp, before moving.
The newer Monaco / Holiday Ramblers are different in that you need to start the motor, get the susspension aired up to ride height, shut the motor back down to bring slides in, then re-start motor.
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Old 11-12-2013, 01:44 PM   #11
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Hmmmmm.......I thought it was only the 5th Wheel diesel folks who idled their trucks excessively.
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Old 11-12-2013, 03:17 PM   #12
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Depends on how long the neighbors dog barked yesterday.
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Old 11-12-2013, 03:27 PM   #13
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Here in the Northland it can get pretty darn cold. I used to drive diesel semis when I was younger and I learned the HARD WAY that you do not just start a diesel engine and put it under load. I have scored cylinders that way.

You probably can't get it up to operating temps idling anyway, but at least let it run a few minutes before you put it to work.

You can get away with that with a gasoline engine for a while. It's still not good for it though.

Some wives may not like it but then they should probably be staying hotels.
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Old 11-12-2013, 03:28 PM   #14
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Quote:
Originally Posted by stuhly View Post
Depends on how long the neighbors dog barked yesterday.
Or how late they kept you up partying and loud laughing !
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