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Old 02-19-2019, 03:21 PM   #1
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Operating temperature......

Aside from some interesting tidbits this is food for thought for those that "exercise" their engine when stored.

For reasons that will become known soon (surprise killer mod!) I ran the engine in place today.

Outside temp: 35F
Block heat on for 12 hours. initial engine temp 55

After 35 !!!!! minutes at high idle (1200RPM) the engine had SLOWLY worked it's way to 145. This is NOT operating temperature. So if you want to exercise your motor you need to take it for a ride, and not around the block. On the highway, 55+ for a half to an hour. THEN you get to operating temperature. There are a lot of people that will tell you that running it at anything less than that does more harm than good. Personally I am in the "no exercise" camp, however the caveat there is that mine will sit for three months at the most.

As an interesting aside, I monitored the temp on the LBCU. The analog gauge NEVER came alive...... I'll be on a road trip next week and then I'll see when the analog gauge actually comes off the peg.
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Old 02-19-2019, 03:43 PM   #2
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My engine temperature observations and tests were never performed in anything as luxurious as your coach.

I drove school buses for many years. Up here in Canada, we know cold. The idea of warming the bus up before going on your route was determined to be a lost cause in fairly short time. If you wanted inside cabin heat from the engine making heat......you better get out on your route and work that baby.

Just shivering from thinking about those years 🥶
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Old 02-19-2019, 07:48 PM   #3
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My engine temperature observations and tests were never performed in anything as luxurious as your coach.

I drove school buses for many years. Up here in Canada, we know cold. The idea of warming the bus up before going on your route was determined to be a lost cause in fairly short time. If you wanted inside cabin heat from the engine making heat......you better get out on your route and work that baby.

Just shivering from thinking about those years 🥶
Funny.... A lot of research landed me on forum pages for people operating and/or maintaining school buses. They've all pretty much gone to the Webasto style heaters, including block heaters. They now warm the fleet without idling, start up and go......
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Old 02-20-2019, 10:24 AM   #4
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Really cold days mechanics would come and start them. Id usually run my for about 10-15 minutes before beginning my route. Mostly to do my precheck pumping the air brakes down and waiting for their recovery checking lights three rounds needed to circle Brutus. Dont miss those cold mornings
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Old 02-20-2019, 10:45 AM   #5
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Really cold days mechanics would come and start them. Id usually run my for about 10-15 minutes before beginning my route. Mostly to do my precheck pumping the air brakes down and waiting for their recovery checking lights three rounds needed to circle Brutus. Dont miss those cold mornings
Well omahagirl......

Up here in Canada our school busses are painted chrome yellow, have no guts, lots of windows, lots of flashing lights.

Yours down there in Virginia look amazingly like a Berkshire.
If mine had looked that cool, Id still be driving my route
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Old 02-20-2019, 12:08 PM   #6
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Quote:
Originally Posted by Oscarvan View Post
Aside from some interesting tidbits this is food for thought for those that "exercise" their engine when stored.

For reasons that will become known soon (surprise killer mod!) I ran the engine in place today.

Outside temp: 35F
Block heat on for 12 hours. initial engine temp 55

After 35 !!!!! minutes at high idle (1200RPM) the engine had SLOWLY worked it's way to 145. This is NOT operating temperature. So if you want to exercise your motor you need to take it for a ride, and not around the block. On the highway, 55+ for a half to an hour. THEN you get to operating temperature. There are a lot of people that will tell you that running it at anything less than that does more harm than good. Personally I am in the "no exercise" camp, however the caveat there is that mine will sit for three months at the most.

As an interesting aside, I monitored the temp on the LBCU. The analog gauge NEVER came alive...... I'll be on a road trip next week and then I'll see when the analog gauge actually comes off the peg.
At work i maintain a fleet of diesel generators, two of them being 600KW and 800KW (1220 hp each). we start them monthly to cycle fuel and ensure that they do in fact start. in working with Cummins on a PM schedule, you are not really in any danger any way you do it. Ideally you want to get it to temp, but there is no real harm Idling it either. you are not doing any damage, but you are not using it as it was intended either.
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Old 02-20-2019, 12:28 PM   #7
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At work i maintain a fleet of diesel generators, two of them being 600KW and 800KW (1220 hp each). we start them monthly to cycle fuel and ensure that they do in fact start. in working with Cummins on a PM schedule, you are not really in any danger any way you do it. Ideally you want to get it to temp, but there is no real harm Idling it either. you are not doing any damage, but you are not using it as it was intended either.
OK, interesting. Thank you. The argument brought forth against idling, especially below operating temp is "wet stacking", which in excess can wreak havoc with our emissions systems, and fuel bypassing rings and ending up in the oil affecting it's lubricity. More frequent oil changes will alleviate any negative impact of the latter. Does Cummins categorize you as "severe duty" or is the short period you run considered inconsequential?
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Old 02-20-2019, 12:39 PM   #8
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OK, interesting. Thank you. The argument brought forth against idling, especially below operating temp is "wet stacking". More frequent oil changes will alleviate any negative impact. Does Cummins categorize you as "severe duty" ?
our gensets are all permanent mounts. we brought up the concerns of wet stacking to our senior service tech. we were told that because our engines are fuel injected and computer controlled, wet stacking is a thing of the past. we put WAY less than 100 hours on our gensets for the year. oil changed once a year regardless of hours and coolant checked once as well. engines idle for cool down at 800 rpm and operate at 1800 rpm. unless loaded up, we never hit operating temps on our gensets either. block heaters set at about 120F and will reach 160ish running, no load.
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Old 02-20-2019, 01:23 PM   #9
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Operating temperature......

Quote:
Originally Posted by kenandterry View Post
Well omahagirl......



Up here in Canada our school busses are painted chrome yellow, have no guts, lots of windows, lots of flashing lights.



Yours down there in Virginia look amazingly like a Berkshire.

If mine had looked that cool, Id still be driving my route


Mine was a 2006 Thomas. One gorgeous morning waiting to pick up my first stop. Gotta enjoy
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Old 02-20-2019, 02:00 PM   #10
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our gensets are all permanent mounts. we brought up the concerns of wet stacking to our senior service tech. we were told that because our engines are fuel injected and computer controlled, wet stacking is a thing of the past. we put WAY less than 100 hours on our gensets for the year. oil changed once a year regardless of hours and coolant checked once as well. engines idle for cool down at 800 rpm and operate at 1800 rpm. unless loaded up, we never hit operating temps on our gensets either. block heaters set at about 120F and will reach 160ish running, no load.
Interesting, and again thank you. Info like this coming from the commercial field in cooperation with the manufacturer is very valid. I am going to change my opinion.
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