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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #31  
Old 05-25-2019
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Randy Dupree Randy Dupree is offline
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Thats the report we were looking for!
Its like having a new bus now!
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2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
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  #32  
Old 05-26-2019
GregOC GregOC is offline
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Quote:
Originally Posted by The Fuenti View Post
the engine performed as designed. For the return trip home I borrowed a ScanGauge Diesel so I could compare readings to the dash gauges. I'm glad I did as I discovered some discrepancies in the readings.

The new Radiator and CAC worked flawlessly. Here are some of the performance highlights/changes I observed:

1. Turbo boost hit 25+ when needed, actually passing trucks on grades. I have never been able to do this. I easily maintained 60+MPH up grades for the first time EVER in this coach and could have easily gone faster had I chosen to do so. As mentioned before, my turbo boost would not pass 7 prior to this repair. Clearly, my CAC has been cracked all along.

2. The pyrometer never hit 600°F...the whole trip. This includes the climb up Chiriaco Summit, and the climb up to Banning through the windmills. In the past, temps would rise to about 1,000°F, at times I would even have to pull over to let the engine cool (even in cooler weather). Heck, in the past, I was thrilled to keep the pyrometer below 700°F

3. No smoke coming out through the exhaust on the roof. Even when under a load, there was no discernible smoke. In the past, I would see brownish exhaust with the engine under load or while climbing a grade.

4. Water temps maintained at about 184-186°F (ScanGauge not dash gauge). During the steepest climb it got to 193°F (got back to mid-high 180's within a few minutes of my letting off the gas), although I was also in 6th and maintaining 60+MPH. I suspect that I could have controlled the temp by downshifting and increasing my RPM's, which I will attempt during our subsequent travels. Based on the readings on the ScanGauge, my analogue gauge reads about 10°F higher. When taking this into consideration, I would estimate that previously the water temps exceeded 205°F and possibly as high as 110°F+ when taking on steep grades (e.g., Cajon Pass, Grapevine, east bound Chiriaco Summit, etc.). Nonetheless, operating temps are now at least 10°F cooler than before, with no significant spiking.

5. MPG improved from about 4.4mpg to 6.2mpg for this leg of the trip. When taking into consideration the cost of fuel in CA, this is HUGE!!! I suspect I can do even better if I am more mindful of fuel economy, but to be perfectly honest, I was simply having too much fun experiencing what this coach was capable of doing.

6. Not sure this is even related to the CAC, but it appeared to me that even the engine brake was working better. It was holding the speed during the descent to Indio better than it had in the past. This may well have been a placebo effect on my part, but it sure seemed better to meat.
The values you state may not be what everyone else has or optimal but it is all you need to build a baseline for future comparison. With a recorded baceline you and the nextowner can use those values to perdict mechanical failure. Silverleaf geeks often look at these values with blank stares no history and no idea of what they predict. . A print out of readable values at stated condition is a better tool. Even simple stuff like how long the tag takes to fill. What temp a particular surface of the front drums get after a given set of stopping conditions location and ambient temps is good to have.

I cant think of a reason why the jake brake would work with more for or how to give that force a value.
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  #33  
Old 05-26-2019
The Fuenti The Fuenti is offline
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Thanks for the feedback. I will certainly be keeping a closer eye on readings and trying to learn more about their significance. Clearly, I had no idea that a max reading of less than 10psi on the boost was of any significance. Had I known, I would have had the CAC checked when I first drove the bus home. Knowledge is indeed power!

As for physical readings outside the coach, I guess I need to be more diligent about getting these readings. Is there a walk-around checklist I should be considering when stopping for fuel or the sort? I go through a checklist and walk-around before getting on the road, however, I have not taken temps of brake drums, or other components. Should I be doing this? If so, is there a list of things that would be helpful to check?

Driving a bus that weighs nearly 50K pounds is something I've learned to take very seriously. I am certainly open to learning anything that will improve my ability to safely operate this amazing piece of engineering.
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  #34  
Old 07-12-2019
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Lee Davis Lee Davis is offline
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Default Heating up

My BMC is starting to heat up quickly when I hit some big hills. Not mountains, just steep grades, not even long ones. Of course, it has been over 90 degrees outside so that doesn't help much. Sounds like from this thread it could be a lot of different things like CAC, radiator, etc. What kind of shop would be able to test all this stuff and do a quality job figuring out if there are one or more problems and what they are?

I will be out in Arkansas going through Oklahoma down to the Texas area and coast later this year and if anyone has a shop out there they can recommend, that would be nice. Do you guys order a new radiator from somewhere and then have a shop put it in, or how does that work. Sorry, I don't know much about this part of the system I don't think I am capable of taking it out myself, but if something else besides just the radiator is part of the problem, I would like to have that checked that out first

Thanks for any help.
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1995 BMC 37
300 HP Cummins 6CTA 8.3 Turbocharged Diesel
Boldly Going Nowhere
http://www.bbirdmaps.com/index.cfm #117
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  #35  
Old 07-12-2019
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max hendrix max hendrix is offline
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When I was having issues with my BMC Cummins, I took it to Cummins in Fort Worth and they are great. Dynamometer to put it under a load and determine what the issue is.

Kirby Radiator in Fort Worth are the go to guys for that kind of stuff here. Van is a friend of mine and he will take good care of you.

I might be able to help in the fall. September / October are nice here in Texas. Good wrenching time.

The absolute first thing to do is the easiest and cheapest Make sure it’s not clogged with grass, leaves, pebbles, oily dirt etc. Then you start worrying about spending money after that

Max Hendrix.
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  #36  
Old 07-12-2019
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sailor7cs sailor7cs is offline
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Hi Lee,
Are you having issues when stopped, is it hard to turn the wheel as to get out of a drive and have to turn hard to get going??? If so, you may have to do what I did, as I was having serious issues climbing the mountains out west here in AZ... I had the Rad and CAC pulled and check at a rad shop, no problems!!!
Then had the Proportional Valve, Power Steering Pump and Compressor replaced new, except rebuilt compressor, had it out, might as well change it all, plus hoses... I have not had any issues with climbing 10000 ft mountains out here and I can steer standing still, though I do not make a practice out of it, except when back out of our lot in AZ!!!
Just something to look at...
HTH

Quote:
Originally Posted by Lee Davis View Post
My BMC is starting to heat up quickly when I hit some big hills.

Thanks for any help.
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Yuma, AZ. 85367
'95 37' BMC 'Pura Vida'
'84 35' FCSB SOLD
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  #37  
Old 07-17-2019
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Lee Davis Lee Davis is offline
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Quote:
Originally Posted by max hendrix View Post
When I was having issues with my BMC Cummins, I took it to Cummins in Fort Worth and they are great. Dynamometer to put it under a load and determine what the issue is.

Kirby Radiator in Fort Worth are the go to guys for that kind of stuff here. Van is a friend of mine and he will take good care of you.

I might be able to help in the fall. September / October are nice here in Texas. Good wrenching time.

The absolute first thing to do is the easiest and cheapest Make sure it’s not clogged with grass, leaves, pebbles, oily dirt etc. Then you start worrying about spending money after that

Max Hendrix.
Max, I did check for the leaves, debris, etc. and the radiator is pretty clean. No problems with that except for some minor dirt washing out. I noticed a while back that some of the insulation I had replaced 15 years ago on the underside of the bed was coming loose (foam type with fibers embedded in it and some kind of heavy core, put on way back then by Holland Motor Homes in Michigan), so I pulled out all I could get to and thought at the time I had taken care of that and would need to get some new material to install. I was reading about the duct board and looking for a 4 x 4 piece. So I was thinking about taking it to a radiator guy and having it checked out, so before doing that I raised the bed to clean the top of the engine so it would be nicer to look at and work on if needed, and noticed up toward the front of the engine, more pieces of that foam insulation laying all over it that I had not been able to see from the raised back Several large pieces. I'm sure all that was part of the problem. After getting all that up, and cleaning out all the rest of the insulation still attached, I went by the radiator guy anyway to get an idea of what he might do and noticed it ran cooler. Not perfect, but cooler. He didn't have time to work on anything and we are on the way to Nashville for some routine Doctors appts, so we are leaving East Tennessee on Monday. I will be watching the temps closely and be careful on the bigger hills. We plan to be out in Texas this winter so perhaps I can look up your guy. Where do you live in Texas by the way? I think you said your guy was in Ft Worth. Anyway, I think I will need some improvement at some point, but I think I am OK for now anyway.
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Lee - 423-292-5767 or Jacque 423-262-9569
or lnjdavis@gmail.com Please call or email instead of private messages


1995 BMC 37
300 HP Cummins 6CTA 8.3 Turbocharged Diesel
Boldly Going Nowhere
http://www.bbirdmaps.com/index.cfm #117
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  #38  
Old 07-17-2019
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max hendrix max hendrix is offline
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Lee.

I’m just a few minutes outside of Weatherford TX. Out in the country. About 45 minutes from Downtown Fort Worth The radiator shop I mentioned is near downtown Ft Worth.

I still work for a living but have resources available to help you if it’s still giving trouble when you get out in this area.

Max
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Freightliner Chassis w/ 515hp S60 & 12sp Ultrashift
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