CHIEFWAHO Posted June 9, 2015 Report Share Posted June 9, 2015 1999 Volvo VNL 610 Cummins M11 celect plus. Truck had been running good getting 8.5 mpg. Truck started feeling a little different, not running as smooth and mpg has fallen off to 7.5 mpg. Also a slight knock. Changed out both fuel filters and no change. Any ideas on what to check next? Link to comment Share on other sites More sharing options...
VegasFlyer Posted June 9, 2015 Report Share Posted June 9, 2015 The answer(s) to that really depends on how far you are comfortable to venture in the mechanical world. The easy points to check is condition of oil and coolant? Do you have a pyrometer or turbo boost gauge? If so what, if any, changes in their indications prior to and now. Prior to this were you on an oil analysis program? If so what were your last few reports like? Some of the potential things could be: FUEL - injector, injector line or fitting leak, blockage. Head Gasket - unlikely, but depending on where one blew, you could get a miss. Bad Cam Lobe Besides checking fluids, if you don't have access to electronic diagnostics, you can take something like an old school auto stethoscope (Harbor Freight - Cheap) and touch the probe to the head at each cylinder and listen for a dead cylinder. Get that info and it will help folks give you a more educated guess, which is all that anyone can do remotely. There are other possibilities though it is all grasping at straws without more data. John Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted June 9, 2015 Report Share Posted June 9, 2015 How many miles are on it? Is it making any smoke- white, blue, really dark grey? Has it lost boost? Is it making oil? When running is the oil level increasing from a faulty injector. These engines are simple enough that anything that goes wrong is usually Air related or fuel related. Is your truck singled? I have the same setup and bobtail I get 11-12mpg and towing I'm getting 10.5. Just wondering the difference in mpg. M11 tuned-400/1450 rockwell 10 singled short with either a 2.94 or 3:08 rear. It turns 1425 at 55mph. Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 9, 2015 Author Report Share Posted June 9, 2015 450K on truck, no smoking noticed boost little over 20 running 55-60 mph have checked oil level frequently and no change in level coolant appears ok when I purchased and drove home bob tailing mpg was 11.5 (think my gearing is 2:90 something) We made it to our friends near Chattanooga, luck would have it he is friends with service manger at local Cummins shop. Plan to take it over to them and have them work it on. Replies are much appreciated. Link to comment Share on other sites More sharing options...
MrSeas Posted June 9, 2015 Report Share Posted June 9, 2015 Could fuel quality be something to look at? Is this your first trip "fully" loaded? Flat lands or "hilly" terrain? Link to comment Share on other sites More sharing options...
Biker56 Posted June 9, 2015 Report Share Posted June 9, 2015 Air filter come unglued and paper into the turbo/CAC? Link to comment Share on other sites More sharing options...
Dollytrolley Posted June 9, 2015 Report Share Posted June 9, 2015 Does your M11 still have the EGR system intact? If it has EGR...... have it checked out ASAP. Our old Freightshaker with a M11 had a odd ting in that the engine often would being at 1375 RPM on level ground 55 MPH and I would notice that the fuel flow would increase and boost would creep up to 15 to 20 and the engine seemed to be under more load. Overall fuel MPG dropped almost in half on long trips down from 13.5 to less than 8 MPG. It was nothing wrong with the engine......it was the spring brake control valve in progressive failure and any time our main system pressure dropped below 110 PSI the spring brake would slightly start applying until the air compressor would build up system pressure to 120 PSI and then the spring brake was fully released........This likely can only happen to me but it does show that sometimes the engine is actually not the problem but other systems are loading the engine and it is only powering up to carry the additional load. Good Cummins shop will likely get to the problem in time.... Good luck. Drive on......... Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 9, 2015 Author Report Share Posted June 9, 2015 Was able to get into a shop in Chattanooga this morning. #6 injector out, plus a tube is broke in 2 pieces going to have to pull head to retrieve those and inspect for further damage. Link to comment Share on other sites More sharing options...
GeorgiaHybrid Posted June 9, 2015 Report Share Posted June 9, 2015 Wish I known you were in town.... The best diesel shop around is just south of Chattanooga by 6 or 7 miles right off of I-75.... Either way, since you are going to be in town for a bit, feel like hoisting a couple in the next day or so? Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 9, 2015 Author Report Share Posted June 9, 2015 Wish I known you were in town.... The best diesel shop around is just south of Chattanooga by 6 or 7 miles right off of I-75.... Either way, since you are going to be in town for a bit, feel like hoisting a couple in the next day or so? Friend of ours from Trenton is friends with service manager at Cummins power south. Still waiting on call back. Will not be in town, we are heading to Tuscumbia tomorrow. May slip back over to truck shop to pick up a few things this afternoon. Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 9, 2015 Author Report Share Posted June 9, 2015 Okay, #6 injector nut backed off causing injector tube to fall into motor. Sounds like parts of it may have got to cam. I had overhead run before trip (1100 miles) by a shop in Joplin. Obviously they did not get it done correctly! I have been in-touch with Joplin service manager. He said they would stand behind their work (we will see!). Joplin service manager is to contact Chattanooga. Waiting for return call, Trying to stay positive and keep my cool! Link to comment Share on other sites More sharing options...
GeorgiaHybrid Posted June 9, 2015 Report Share Posted June 9, 2015 The only fun spot to this entire saga is that he is staying in my hometown with friends (pop less than 2300) and his truck is sitting about 4 miles from where I work..... What are the odds.... Like I said, if you need anything, just give us a ring... Link to comment Share on other sites More sharing options...
Ronbo Posted June 10, 2015 Report Share Posted June 10, 2015 What did the overhead run you" Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 10, 2015 Author Report Share Posted June 10, 2015 What did the overhead run you" Overhead was $315 but may end up being $7k plus! Link to comment Share on other sites More sharing options...
adept99 Posted June 10, 2015 Report Share Posted June 10, 2015 Hey Chief; Do you need help moving your rig or anything? Not that far away. Call me if something comes up. Paul Link to comment Share on other sites More sharing options...
Dollytrolley Posted June 10, 2015 Report Share Posted June 10, 2015 Overhead was $315 but may end up being $7k plus! Ouch.......Like I indicated at the end of my post a good shop found the problem in short order. It's a real bummer when you have service done to keep your rig in good condition and the "service" turns into more problems than you were trying to prevent. When you indicated that you were running 20 boost on the level it was a good indication that the engine was highly loaded all of the time.....if you consider that you had a six cyl. engine running on Five Cly it is amazing it ran as well as it did. When I was just out of high school I had replaced a leaking front crankshaft seal on one of "Grumps" cummins 335 KW log trucks.......I did not properly torque the harmonic balancer and.........in short order the crankshaft BROKE at the #3 cyl crank throw.........What a mess...... My mistake was VERY costly and was very much a family hardship.......Grumps could of said a lot of bad things but he said ......"when you get out of school you feel like you have the "answers"........but once your out of school the REAL lessons begin..... a mistake remains a mistake unless you learn the "lesson"........ I hope your problem is resolved in a reasonable manner and soon. Best regards, Link to comment Share on other sites More sharing options...
adept99 Posted June 13, 2015 Report Share Posted June 13, 2015 Any Good News? Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 15, 2015 Author Report Share Posted June 15, 2015 The Joplin shop authorized the Chattanooga shop to get started last Thursday. We were busy with our event and getting home after that. Hope to get time to call today. Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 15, 2015 Author Report Share Posted June 15, 2015 Any Good News? Oh, and by the way it was nice to meet you. And thanks for the offer to help. Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 15, 2015 Author Report Share Posted June 15, 2015 The only fun spot to this entire saga is that he is staying in my hometown with friends (pop less than 2300) and his truck is sitting about 4 miles from where I work..... What are the odds.... Like I said, if you need anything, just give us a ring... David, great talking to you the other day. It is a small world. Thanks for offering to help. Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 18, 2015 Author Report Share Posted June 18, 2015 Well finally some good news. NO damage to the engine block. NO coolant in oil! They did say the CAM took a pretty good hit from the injector tube. New CAM has been installed and they are putting the rest back together. They did recommend that I replace the rocker arm bushings, (2) rocker shafts and one of the other injector push tubes. Said these items have nothing to do with the injector nut backing off. I will be responsible for cost of those parts but not labor since they are already in there. Should be done by the first of next week. Now have to figure out how and when to get over to pick the truck up. Link to comment Share on other sites More sharing options...
Jack Mayer Posted June 18, 2015 Report Share Posted June 18, 2015 Rods and main bearings, as well? Link to comment Share on other sites More sharing options...
CHIEFWAHO Posted June 18, 2015 Author Report Share Posted June 18, 2015 Rods and main bearings, as well? Shop was to inspect what they tore down to and let me know if anything else needed done. Rods and main bearings were not mentioned. Link to comment Share on other sites More sharing options...
Dollytrolley Posted June 18, 2015 Report Share Posted June 18, 2015 Rods and main bearings, as well? X2 on that........It's "Almost-fun" (and cheap) to spin-in a new set of rod & main bearing when the pan is off and it is a cheap way to fresh'n-up the ole engine while you have a chance....... On the other hand if the oil pressure is up and the filters look good there is something to be said for .........IF it aint broke DON'T fix it......... It seems that the injector debris problem was caused by good intentions gone ......bad Darned if ya do.......darned if ya don't........ The good news is that the "fix" did not involve scraping the entire engine..... Drive on.......... Link to comment Share on other sites More sharing options...
rickeieio Posted June 18, 2015 Report Share Posted June 18, 2015 It's refreshing to hear that both you and the current shop are honest about not asking the first shop to pay for additional parts. Good on both of you! Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.