| Author | Message | ||
| Buddy Tennison (Buddyten)
Registered Member Username: Buddyten Post Number: 58 Registered: 7-2005 Posted From: 207.68.234.24 Rating: N/A |
Hey Guys: It is me again with another of my questions. To bring you up to speed on what I have: 83 Eagle with 8V71 and 5 speed tranny Had a ring job, inserts, etc about 15-20K ago. Mechanic checked all the parts and told us that everything seemed to be good and within allowable tolerances. He also told us that because we don't put a lot of continuous driving miles that it would take a while for break in, and that oil consumption would be a little higher than normal. We have been running now about a year. Our mechanic has since had some major health problems and is disabled and closed his shop. Have not been able to talk to him much about it. Very little to no smoke except on start up and under a load. Very little oil on the back of the bus to indicate blow by. People who have followed us confirm little or no smoke. We have observed no leaks to speak of, and the slobber tubes are no putting out a lot of blow-by. Engine runs really good. Plenty of power. Oil pressure stays around 48-60 psi pretty consistently, dependent on where we are driving. (In high gear, out on fairly flat roads, Oil pressure stays around 50-55) Problem is, we are using about a gallon of oil every 400-500 miles, and sometimes more than that. We are using Shell Rotella 40W as some of you have suggested. Where is the oil going?? If it was burning that oil, shouldn't there be the tell-tale smoke, etc? We have noticed that on the driver side, around where the slobber tube is, there seems to be a lot of "wet oil" on the engine, but at idle (either normal idle or fast idle), there is not much slobber coming out. We are getting ready to change oil and filters this week to see if that helps. Should we use a different brand/weight of oil? Any suggestions would be very much appreciated. | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 343 Registered: 8-2006 Posted From: 74.33.36.66 Rating: N/A |
Buddy, I would change brands of oil I have a 8v92 in my Eagle and it does not like the Rotella uses a gal about every 1000 miles and I would also see if it makes any difference if you leave it about 1/2 gallon low does your engine have the check valves on the drain tubes.I use Delvac or DD oil(same oil) now and use a gal about every 3000 miles good luck (Message edited by luvrbus on April 07, 2008) | ||
| Laryn Christley (Barn_owl)
Registered Member Username: Barn_owl Post Number: 316 Registered: 10-2006 Posted From: 72.66.181.54  Rating: N/A |
Exxon's XD-3 40wt is another very good oil for the DD TS and usually easier to get. | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 344 Registered: 8-2006 Posted From: 74.33.36.66 Rating: N/A |
BarnOwl, I think that is the same oil as the Delvac and the DD oil good stuff (Message edited by luvrbus on April 07, 2008) | ||
| Buddy Tennison (Buddyten)
Registered Member Username: Buddyten Post Number: 59 Registered: 7-2005 Posted From: 207.68.234.24 Rating: N/A |
Thanks guys: What name brand is Delvac or DD oil? We get the Rotella from the local Shell distributor, but I have never heard of the Delvac. Where is the best place to get it? | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 345 Registered: 8-2006 Posted From: 74.33.36.66 Rating: N/A |
Buddy, Delvac is Mobil\Exxon so is the Detroit Diesel brand of oil (Message edited by luvrbus on April 07, 2008) | ||
| niles steckbauer (Niles500)
Registered Member Username: Niles500 Post Number: 832 Registered: 11-2004 Posted From: 71.42.167.154 Rating: N/A |
You may want to try letting it run about a half gallon low and see if your consumption goes down - this has worked for others - HTH | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 997 Registered: 10-2003 Posted From: 71.58.48.5  Rating: N/A |
Did he install piston and liner kits or just new rings on the old pistons? When it is hot and idling, is the exhaust clear or with a very slight light black haze OR is it somewhat bluish until you speed it up? What color is the smoke under a load. Should be a little black and then completely clean up above 1700 or so. What size injectors? The one thing with Detroits or for that matter all diesels, they run good or better even if they burn oil. Many old jimmy drivers said they ran the best right before they blew up.( needed rebuilt). High oil level could be your problem or might need more miles to break in; especially if old liners and pistons were reused. Also if reusing the liners, thehoning cross hatch could be improper.Can take 10,000 miles to completely seat rings if it has been driven easy all the time. Even so, the oil consumption should gradually drop over the break in miles if the parts are ok, except, of course the oil level being too high. The one problem with cheap off brand liner and piston/ring kits can be poor oil control after break in due to lower quality materials. He might have broken a ring or two during installation. This could be checked by removing inspection covers and checking each ring for proper tension. Unfortunately this is nearly impossible in some coaches. | ||
| Donald P Hann (Eagle19952)
Registered Member Username: Eagle19952 Post Number: 3 Registered: 11-2007 Posted From: 98.196.153.247 Rating: N/A |
Chevron Delo 100 works well too. | ||
| James Robinson (Jjrbus)
Registered Member Username: Jjrbus Post Number: 119 Registered: 12-2000 Posted From: 68.243.1.135 Rating: N/A |
Good info here. It seems odd that the same engin with the same dipstick would start throwing out oil. Is it possible the dipstick/oilpan was changed? Out of the options you have the simplist one is to run it a 1/2 gal low and see what happens. | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1002 Registered: 10-2003 Posted From: 71.58.48.5 Rating: N/A |
he might be adding " extra oil " everytime he checks it so it doesn't get too low. The crank is close enough to the full pan that it whips it into a small hurricane that the rings have a hard time dealing with. | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 346 Registered: 8-2006 Posted From: 74.33.36.66 Rating: N/A |
Buddy,I am not a DD expert but have a friend that is he said make sure you don't have to much oil he said the engine should hold + or- 7 gals and if that is not the problem it is more than likey the guy forgot to check the piston pin retainers with the vacuum tester at 10in or you could have bad valve guides good luck on this | ||
| Paul Lawry (Dreamscape)
Registered Member Username: Dreamscape Post Number: 253 Registered: 5-2007 Posted From: 75.145.74.185  Rating: N/A |
I learned the hard way that you need to let the DD sit for at least one hour before checking your oil level, takes a long time to drain down. Also our 8v71 really likes it when it's half gallon low, and it stays there for quite a while. It does not like to be topped off. Although I don't really know the internal situation on wear with ours, this is what has worked so far. | ||
| James Stacy (Jimstacy)
Registered Member Username: Jimstacy Post Number: 131 Registered: 1-2001 Posted From: 76.228.61.248 Rating: N/A |
"full" mark on dipstick should be 1" below pan gasket. There were many different sticks and tubes available. They often got mixed up. | ||
| FAST FRED (Fast_fred)
Registered Member Username: Fast_fred Post Number: 287 Registered: 10-2006 Posted From: 66.90.226.172 Rating: N/A |
"I learned the hard way that you need to let the DD sit for at least one hour before checking your oil level," Da Book I have sez 5 min. For anyone attempting to run low on oil as a leak preventive , be sure to monitor the oil pressure . If the pressure bounces at cruise , thats AIR , instead of oil "lubing" your engine! Far easier to pour in a bit of oil than slip in a new crank, rods and bearings. FF | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1012 Registered: 10-2003 Posted From: 71.58.48.5 Rating: N/A |
I liked the setup on the Brill I had. It had a small round glass window to maintain the oil half way up the glass. It had a scavenging pump and put the oil into a separate section with that window. Probably many people put in extra oil so they don't have to add so often, causing more trouble with leaks and excessive consumption. | ||
| Bob Symonds (Bob_symonds)
Registered Member Username: Bob_symonds Post Number: 35 Registered: 5-2006 Posted From: 146.235.66.52 Rating: N/A |
I have a 4104 and I run it 1/2 gallon low. It never needs oil unless I top it off then it will "loose" that 1/2 gallon somewhere. |