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Old 11-10-2016, 09:00 AM   #61
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Great idea. I will do that.
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Old 11-10-2016, 11:54 AM   #62
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Originally Posted by bushpilot View Post
What rear gearing are you running?
BTW, it looks like I have a 3.70 gear in my axles according to my door tag.

I've had some interesting recent discussions on a FB page for Detroit engines. We used quite a bit of oil on our trips last year, about 3-gallons for 10K miles. A lot of guys responded that our rig is overpowered for the load and that we're running it too softly and glazing the cylinder walls. There's a lot more to this but the glazing came up after I was asking them what was a good RPM to run these engines at under load. Although the glazing concerns have some merit there are other potential causes for our oil consumption, turbo and air compressor. Our issue seems to be due to a faulty air compressor. The potential glazing issues had and still have me concerned but hopefully it's not and will not be an issue. One thing I've learned from all of this is to limit idle time with these engines and don't be afraid to lean on the engines and make some power. We also had some discussions on oil type. We've been running Rotella-T since it's easy to get in 10-gallon quantities at Sam's Club. Almost everyone said ditch the Rotella and switch to either Mobil or Delo . I called Interstate Diesel to ask them some questions on our engine rebuild and the guy there said to be careful about switching away from Rotella. He said Rotella has a lot of adhesion and didn't quite say it leaves deposits but did say switching oil brands may release a bunch of stuff that the Rotella is holding in there.
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Old 11-11-2016, 08:25 PM   #63
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well i have wondered the same thing about glazing - but we don't have an issue w/ the engine being TOO cool - but the tranny rarely comes off the cool / 125* mark.

and after 130k or so were not burning any oil.
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Old 12-19-2016, 03:10 PM   #64
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Default ~32ft tag Motorcoach

Need to wake up, Deepvee, Bushpilot, Bob86224, petrel and other smart MC owners again on my hunt for a MC. Got hung up and delayed due to an unexpected Cummins repair. Fuel pump failed and found a cracked exhaust header. Fixed so back in hunt.
My new question. Engines. My cummins was fixed by a Kenworth dealer with a huge shop and they strongly favor Cummins and Paccor engines but those are the engines in the Kenworths so it makes sense. I told them what I was looking for and they right away said no one near me in S La(near Houma in the oil patch) works on Mercedes engines and that they advised me to stay away from Detroits and Cats as well. They hate them both. That narrows things way down.What are your opinions on that? Having an engine that a nearby shop can work on would be a plus if it goes down but I will do all the regular maintenance on it.
Speak WISE ONES!
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Old 12-19-2016, 04:25 PM   #65
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.... I told them what I was looking for and they right away said no one near me in S La(near Houma in the oil patch) works on Mercedes engines and that they advised me to stay away from Detroits and Cats as well. They hate them both. That narrows things way down.What are your opinions on that? Having an engine that a nearby shop can work on would be a plus if it goes down but I will do all the regular maintenance on it.
Speak WISE ONES!
1st know that the Mercedes Engine is a rebranded Detroit motor - god knows theres some modifications (beyond the valve covers w/ the 3 pointed Benz star).

No one is surprised that a dealer or service location would recommend against something they can't offer you

I'd be willing to bet that Freightliner out sells both KW & Pete (combined)
Volvo probably does too.

Freightliner are all over the place - and there are tons of dealers up and down the interestate...not to mention that parts are so common that any truck stop can work on this stuff.

Either way - these are Million mile chassis & Motors - good lucking wearing them out as an RV'er.

Detroit has over 800 authorized service centers -> this link doesnt account for the Independent Shops https://freightliner.com/Dealers

Having a service center close to home doesnt mean SQUAT when youre traveling.

If youre doing all the service yourself (assuming youre doing it at home) all you need is UPS & Freight delivery

This link infers that not all Peterbuilt dealers service KW and vise versa
https://www.paccarfinancial.com/page...erlocator.aspx
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Old 12-19-2016, 04:58 PM   #66
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You sorta lost me with the Freightliner and everyone being able to work on them which suggests that Freightliner has a standard fitted engine which is? I suppose you are right that the important consideration is when I might break down on the road and not near home since I told you I will do my own service. I dropped into a tunnel vision mode and lost sight of the obvious. Stupid me. So what engine or engines are the easiest to get serviced if/when I bugger something up on the road?
Thanks for the quick reply.
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Old 12-19-2016, 05:15 PM   #67
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My point was - there are MORE freightliners on the road than anything else, which means more dealers, more service centers & probably more independents who can service it (aka any truck stop).

Freightliner - like any one of the MFG's offers different engine options, MB is one of 'em.
The MB motor is a rebranded Detroit.

the PacCar guy did a number on your logic, I sell too....Its what we do.

I couldn't tell you what is easer to service - I havent needed any service. I bought our coach w/ slightly less than 80k on it (IIRC). The 1st year we racked up a good 25 or 18k, I got sick and we barely touched it one year....I think were over 140k now....NO problems at all.
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Old 12-19-2016, 05:33 PM   #68
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As a former diesel mechanic, I can assure you that a typical freightliner/Peterbuilt/kenworth/international dealer can and will service any Cummins, Detroit, M.B. or Cat engine. Some of them won't touch a volvo engine but over the years Freightliner has had all of the major manufacturers as options in their truck. The only one I would even worry about would be a volvo engine. Very good engines but only warrantied at volvo dealers. Heck take a look at all the "RUSH" truck centers and decide for yourself. They sell just about everything and are all over the country.
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Old 12-19-2016, 07:26 PM   #69
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As a former diesel mechanic, I can assure you that a typical freightliner/Peterbuilt/kenworth/international dealer can and will service any Cummins, Detroit, M.B. or Cat engine. Some of them won't touch a volvo engine but over the years Freightliner has had all of the major manufacturers as options in their truck. The only one I would even worry about would be a volvo engine. Very good engines but only warrantied at volvo dealers. Heck take a look at all the "RUSH" truck centers and decide for yourself. They sell just about everything and are all over the country.
Cannot thank you enough for your reply. Diesel mechanics know what is what like I knew(now retired) what was what as a practicing Orthodontist and listened to other Orthodontists when I was treating a particular difficult case and needed help when strange stuff happened. Yes. No matter what your profession, strange things pop up and others are always ahead of you.
Great info and thanks again.
Phil
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Old 12-19-2016, 11:38 PM   #70
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I'll add that you may also want to consider older pre-2007 (I think is the year) engine so you don't have the DPF and DEF. These seem to be a source of reliability problems. The 2003-2006 engines have EGR, prior to that should be non-EGR I believe. You probably know Cat got out of over the road due to emissions.

Freightliner chassis is the most popular, and Cummins is the most common engine. Does not mean others are not good, but as mentioned it could be tougher for service or parts availability.

I have the Eaton 10-speed auto shift without clutch pedal inside the cab. Very easy to drive, the trans does pretty good with using the right gear. No real complaints from me. My engine is Cummins ISX, with EGR only. So far been very good and also no complaints. Mine specifically is the CM870 version, which a few service type guys have told me is a good one and generally no big reliability issues.
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