Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Navistar MaxxForce Engine Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-12-2020, 10:45 AM   #57
Junior Member
 
Thor Owners Club
Join Date: Oct 2020
Location: Toledo, OH
Posts: 15
Drove 560 miles home

Pretty impressed with engine so far. Drove 70-75 and got slightly over 10 MPG. Second tank pulled it back to 1500 RPM, about 66-68 MPH and got 11 MPG. Have an ABS light on which was there at purchase (dealer is reimbursing the repair) but that is a chassis issue and not engine related.

Overall, VERY quiet, air conditioning cranks, plenty of power. Way better than the gas Class A we had when I was a kid. That thing was loud, doghouse got hot, terrible mileage, underpowered, and couldn't get out of it's own way!

Hork
Hork is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 11-13-2020, 01:41 PM   #58
Junior Member
 
Winnebago Owners Club
Join Date: Nov 2015
Posts: 10
No probkem here either

Quote:
Originally Posted by VestaDave View Post
The MF 7 was installed in Breeze, Nexus, Vesta, and Serrano. There may be others but the point is, all told they are in a relatively small number of Motorhomes. But remember, they were also installed in school buses and trucks. I don't know how many but my guess is that the number in service gets much bigger. Looking at this site and elsewhere there seems to be relatively few complaints about the engine. It's true, that Navistar screwed the pooch on their approach to the 2010 emissions. I believe the MF 10 and 7 were the only two motors of their line that met the standards. As a result the company is not only facing lawsuits, they lost billions in revenue!
Bottom line, the motor has performed flawlessly and no DEF needed while returning amazing Mpg ( in my opinion).
We had our Serrano for 30k with no issues, towing a 5k pound jeep. You can be certain the rubber tube connecting the air intake to the turbo will fall off at some point. The use a 5$ clamp instead of a 10$ Clamp, snd this is the source of all the internet buzz. Thor has an upgraded clamp available. Bigger clamp, and comes with glue (seriously). It wonít fall off, and then all is good. Be SURE that anyone doing an oil change knows to clamp this down well. Most will undo the clamp to get to the oil filter, and you need to be sure they really clamp it down when they are done.
vnorvi is offline   Reply With Quote
Old 11-14-2020, 06:25 AM   #59
Junior Member
 
Thor Owners Club
Workhorse Chassis Owner
Join Date: Apr 2020
Location: St Paul, MN
Posts: 7
Quote:
Originally Posted by vnorvi View Post
We had our Serrano for 30k with no issues, towing a 5k pound jeep. You can be certain the rubber tube connecting the air intake to the turbo will fall off at some point. The use a 5$ clamp instead of a 10$ Clamp, snd this is the source of all the internet buzz. Thor has an upgraded clamp available. Bigger clamp, and comes with glue (seriously). It wonít fall off, and then all is good. Be SURE that anyone doing an oil change knows to clamp this down well. Most will undo the clamp to get to the oil filter, and you need to be sure they really clamp it down when they are done.
Recently turned 42,000 miles on our 2013 Serrano. Drove it from our home in MN to an RV park in AZ (where we plan to stay off & on during the upcoming winter) Total trip @ just under 1,800 miles, with average speed around 70 mph. Managed just over 10 mpg on the trip. The Maxxforce 7 performed flawlessly through various terrains! After replacing the often-referenced diesel turbo tube & clamp, so far we couldn't be happier with the overall performance of this motor!
Jdsandb is offline   Reply With Quote
Old 11-23-2020, 04:45 PM   #60
Junior Member
 
Thor Owners Club
Join Date: Oct 2020
Location: Toledo, OH
Posts: 15
Just purchased a Serrano/MF7

Well, we pulled the trigger and bought a Serrano 34M (bath and a half). Bottom line is that we love the floorplan and styling (ie. different). Drove 560 miles home from purchase, ran great. First tank ran 70-75 mph and got 10 mpg, some hills in VA/WV/PA. Second tank pulled back to 1500 rpm which was about 65-68 mph and got 11 mpg!

First impressions: Great mileage, seemed to have plenty of power, amazingly quiet once up to speed, doghouse was not hot, and factory A/C cranked!

Had two gas RVs as a kid, one Class C and one Class A and I remember them being loud, hot, and not being able to get out of their own way.

Will be counting on you guys to help me keep this rig up and running; wife and I are planning to put some money into the old gal in mods and restoration's. So far I have learned from all of you that oil changes RELIGIOUSLY at 5,000 miles are non negotiable, 1500 rpm is a sweet spot in this and most diesels, long periods of idling are very bad for this non DEF setup, and inspect the turbo clamp and replace with one available from Buddy Gamel.

You guys rock for so freely sharing info.

Hork
Hork is offline   Reply With Quote
Old 11-24-2020, 10:29 AM   #61
Junior Member
 
Winnebago Owners Club
Join Date: Nov 2015
Posts: 10
Oil changes

One other minor lesson we learned. When the oil is changed most mechanics will remove the turbo tube to get to the oil filter. Of these, only about half of mechanics will tighten it down well after they are done. Be sure to make sure your oil change person knows about this in advance.
vnorvi is offline   Reply With Quote
Old 12-03-2020, 02:51 PM   #62
Junior Member
 
Join Date: Feb 2014
Posts: 16
Serrano

Quote:
Originally Posted by Hork View Post
Thanks for the reply. Pulled the trigger on a Serrano today; pretty excited about it.
I know you just bought your serrano . what do you think so far with the Maxxforce 7? Any issues? we are looking to purchase a serrano also here next week.

thanks
manny
MANALPINE is offline   Reply With Quote
Old 12-04-2020, 06:23 AM   #63
Junior Member
 
Join Date: Jul 2019
Posts: 11
I bought a Serrano 34M 2013, in 2017.

Bought it at 28K miles, and now at 52K...



Never had problems, run smooth and very efficient. My mecanics told me to change oil every 5k miles or more often and that is what I go with.



We really like it.
Freddyjoe is offline   Reply With Quote
Old 12-04-2020, 10:33 AM   #64
Junior Member
 
Thor Owners Club
Join Date: Oct 2020
Location: Toledo, OH
Posts: 15
Quote:
Originally Posted by MANALPINE View Post
I know you just bought your serrano . what do you think so far with the Maxxforce 7? Any issues? we are looking to purchase a serrano also here next week.

thanks
manny
Only drove it home so far and a couple of times locally but impressed so far. Feel free to call me, 316-650-9593. Late is Ok, we are night owls.
Hork is offline   Reply With Quote
Old 12-05-2020, 09:07 AM   #65
Junior Member
 
Thor Owners Club
Join Date: Oct 2020
Location: Toledo, OH
Posts: 15
Quote:
Originally Posted by Freddyjoe View Post
Bought it at 28K miles, and now at 52K...



Never had problems, run smooth and very efficient. My mecanics told me to change oil every 5k miles or more often and that is what I go with.



We really like it.
Freddy!! You are the first one I have seen with a 34M, not very common. There were 2 nationwide for sale when I bought mine, havenít seen one since. Hey I may need help since we are new but first question: There are 5 lighting switches (I think) in the back bedroom, righthand wall facing and underneath the TV. There is a row of 3 and then mine has a row of 2 right under those. Those 2 donít seem to do anything. What are they for/to? Headed to Elkhart next week for renovations so I can get fixed if I knew what they are for. Thanks!!!
Hork is offline   Reply With Quote
Old 12-05-2020, 05:17 PM   #66
Junior Member
 
Join Date: Jul 2019
Posts: 11
Quote:
Originally Posted by Hork View Post
Freddy!! You are the first one I have seen with a 34M, not very common. There were 2 nationwide for sale when I bought mine, havenít seen one since. Hey I may need help since we are new but first question: There are 5 lighting switches (I think) in the back bedroom, righthand wall facing and underneath the TV. There is a row of 3 and then mine has a row of 2 right under those. Those 2 donít seem to do anything. What are they for/to? Headed to Elkhart next week for renovations so I can get fixed if I knew what they are for. Thanks!!!
I will to go check because it is stored for winter. We live up north in Canada. You can write me at freddyjoe1969@gmail.com.
Freddyjoe is offline   Reply With Quote
Old 12-08-2020, 08:14 PM   #67
Junior Member
 
Thor Owners Club
Join Date: Oct 2020
Location: Toledo, OH
Posts: 15
Quote:
Originally Posted by Freddyjoe View Post
I will to go check because it is stored for winter. We live up north in Canada. You can write me at freddyjoe1969@gmail.com.
Hello again!

Tried writing you but comes back as invalid email address.
__________________
Frank ďHorkĒ Molnar
2012 Thor Serrano 34M
Hork is offline   Reply With Quote
Old 12-09-2020, 12:00 PM   #68
Junior Member
 
Join Date: Jul 2019
Posts: 11
Quote:
Originally Posted by Hork View Post
Hello again!

Tried writing you but comes back as invalid email address.
The email address is ok...!! freddyjoe1969@gmail.com
Freddyjoe is offline   Reply With Quote
Old 04-27-2021, 06:43 PM   #69
Junior Member
 
Join Date: Jul 2019
Posts: 9
We have an allegro tiffin breeze, 2014, 28 feet, runs great except same thing black smoke a bit comes out when we accelerate. What is this and how do we fix?
Lumpysgirl is offline   Reply With Quote
Old 04-28-2021, 04:13 PM   #70
Junior Member
 
Winnebago Owners Club
Join Date: Nov 2015
Posts: 10
Quote:
Originally Posted by ron55 View Post
Lookin to buy a nexus rv with international 7 engine
How are the newer max force 7 engines doing?
Are they as good or trouble free as the cummins? THANKS FOR ANY INFO
We had our Serrano for about 10 yrs and 30k miles. They have a bad reputation, which results in a good price in the RV. The reason they have a bad reputation, however, is because of a) the general relationship to the Ford engines. But these engines have nothing to do with the Ford engines, and b) you will commonly read about the turbo inlet tube popping of. It did with ours, and will will every one. BUT there is a simple preventative measure. You either get the update kit from international (basically a more robust clamp that looks like a radiator hose clamp) or b) buy a bigger clamp. In either case drilling though the clamp and putting in a metal screw. Problem solved.

But note. The oil filter is hard to get to without removing the clamp. You have to really push the oil change people to tighten the clamp down well: if you do not, they will not, and the clamp will pop off . For sure. . Better yet, pop off the engine cover and just tighten it yourself after every oil change.

Once we this we never had a hiccup.
vnorvi is offline   Reply With Quote
Reply

Tags
engine



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dynamax Customer Satisfaction with Force, Force HD, or DX-3 petrel Class C Motorhome Discussions 0 09-11-2015 06:58 AM
Max Force 7 filters RWeigant Monaco Owner's Forum 5 04-24-2013 03:45 PM
max force gramps66 MH-General Discussions & Problems 3 07-30-2012 10:31 AM
Max Force Engine an oil maker? rg neumann Monaco Owner's Forum 6 10-19-2011 09:35 AM
Max Force 7 Regen Penguy Thor Industries Owner's Forum 10 07-28-2011 03:58 AM


All times are GMT -6. The time now is 11:17 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.