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+--- Thread: Runaway OM617 (/showthread.php?tid=3116)
Runaway OM617 - charliebob - 11-13-2011
I have a 1983 OM617 mounted on a stand. 139k documented miles. Starts easy, runs good, revs quickly. No abnormal smoke, black or white.
When I hold the throttle steady at, I'm guessing, 2000 rpm or higher, it will "take off" and suddenly rev very high after a time of smooth, steady running. This is after normal turbo boost and whistle. The overrevving usually occurs 30 seconds or so after the steady 2000-3000 rpm, but may not happen for a few minutes. This happens if I hand hold the throttle, or mechanically fix the position.
Any ideas? Is this due to the governor, or could it be because the over-boost controller is not connected? Or does it just need normal maintenance, like valve adjustment?
I'm familiar with diesels in general but not with the OM617.
Any suggestions about what is causing the engine to run away?
Thanks.
Bob
RE: Runaway OM617 - iheartboost - 11-13-2011
Run away on a 617 with that few miles seems odd. Imo. Its probably something easy. Seals, blah,blah but I really dont know
Bump for people that have more knowledge of this engine!
RE: Runaway OM617 - aaa - 11-13-2011
Excessive oil getting into the combustion chamber will cause runaway.
I don't think its running away though. Maybe it wasn't running properly for those first few minutes, and when the problem cleared up the rpm went up.
RE: Runaway OM617 - EDH_Performance - 11-13-2011
Maybe the turbo spits out oil of the compressor? We had a car that took off like that, and that was because of the turbo!
RE: Runaway OM617 - Captain America - 11-14-2011
Well in a free rev situation, I have never really been able to maintain a constant high (2000+) RPM. Mine would take off that same way. I just thought when the turbo started to spool, the IP gave it more fuel and the RPM went up ....
RE: Runaway OM617 - charliebob - 11-14-2011
(11-14-2011, 01:50 AM)Captain America Well in a free rev situation, I have never really been able to maintain a constant high (2000+) RPM. Mine would take off that same way. I just thought when the turbo started to spool, the IP gave it more fuel and the RPM went up ....
Thanks Cap'n. This is what it seems like to me. I don't see any sign of oil blow by. Smoke would be instantly noticeable out my 3' downpipe.
At some level of boost, the IP seems to get overly aggressive in giving more fuel. Slightly backing off the throttle when this happens quickly brings the RPMs back down. I'm not sure it would be noticeable while driving, unless the driver had an especially sensitive right foot.
Bob
RE: Runaway OM617 - dieselmeken - 11-14-2011
The governor in the pump is a min-max type. Pump regulate the rpm on low & high idle only, there between you run the rack directly with the throttlepedal.
Everything is normal, nothing to worry about.
RE: Runaway OM617 - willbhere4u - 11-14-2011
Every 617 turbo I have seen dose this at 2-3k rpm! It's PERFECTLY NORMAL
as the turbo starts spooling it slowly starts making boost it revers higher with a fixed throttle position because the boost then makes the ALDA adds fuel increasing rpm usually only up to 3500-4000rpm
All OM617 turbo diesels will do it in neutral! in a car or not if the ALDA and turbo are working properly!
I call it the runaway speed
If you hold it steady at 2k RPM nothing then slowly increase rpm by 100 rpm until it takes off then you can actually let off the throttle slowly and it will keep revving until you let off to much!
Don't worry about over revving it! It will cut fuel at around 5k RPM you cannot physically make it over rev unless it has a stick shift and you down shift in to the wrong gear!
RE: Runaway OM617 - Captain America - 11-14-2011
Thanks for confirming dieselmeken and Willb. If you have a good running engine I have noticed that it will rev smoothly but if you have a not so healthy engine, it will tend to hunt around a bit
RE: Runaway OM617 - charliebob - 11-14-2011
Thanks to all for setting my mind at ease. Since the OM617 powertrain seems to be perfectly normal, I think I'll put it in my 36 Dodge to make a long distance cruiser. Photoshopped pic attached. I have the frame and suspension ready for the engine. Lexus/Supra suspension!
RE: Runaway OM617 - willbhere4u - 11-14-2011
Cool project I would get some torque thrust Wheels other than that it's bitchin
Those wheels in the pic look like the ones on my girl friends forester
RE: Runaway OM617 - charliebob - 11-14-2011
(11-14-2011, 09:02 PM)willbhere4u Cool project I would get some torque thrust Wheels other than that it's bitchin
Those wheels in the pic look like the ones on my girl friends forester
The torque thrust wheels would look better and certainly more traditional. Unfortunately, I think they would have to be custom made--which means $$$$$$--to get the high offset needed for the suspension. Wheels shown are the staggered wheels stock on a Lexus SC. I just happen to have an inexpensive set and photoshopped them in.
Bob
RE: Runaway OM617 - ConnClark - 11-15-2011
A partially fouled ALDA line can cause what you are describing. Clean your banjo bolt on the intake manifold. It would be best if you had a boost gauge you could watch while it occurs.
RE: Runaway OM617 - RamblinWreck - 02-08-2012
(11-14-2011, 06:05 PM)charliebob ... I think I'll put it in my 36 Dodge to make a long distance cruiser. Photoshopped pic attached. I have the frame and suspension ready for the engine. Lexus/Supra suspension!
Do you have a seperate thread for your '36 Dodge build? Looks like it will be awesome, that is a beautiful car. What are your plans to boost the power? turbo? injectors? IP? etc...
RE: Runaway OM617 - charliebob - 02-08-2012
(02-08-2012, 11:14 AM)RamblinWreck(11-14-2011, 06:05 PM)charliebob ... I think I'll put it in my 36 Dodge to make a long distance cruiser. Photoshopped pic attached. I have the frame and suspension ready for the engine. Lexus/Supra suspension!
Do you have a seperate thread for your '36 Dodge build? Looks like it will be awesome, that is a beautiful car. What are your plans to boost the power? turbo? injectors? IP? etc...
Actually, I changed plans after a lot of measuring and calculating. The Dodge is very narrow, only 24" wide between frame rails and hood sides at the front of the engine. I could squeeze it in by major relocation of AC and PS, but it would still likely be too tight and bang against hood sides with shake that occurs sometimes on shutdown.
Sooo, saving the diesel for a 47 Ford "Jailbar" truck which is much wider.
Thanks for the compliment.
RE: Runaway OM617 - RamblinWreck - 02-08-2012
(11-14-2011, 06:05 PM)charliebob Sooo, saving the diesel for a 47 Ford "Jailbar" truck which is much wider.
Start a thread for that build and let me know. Sounds nice.
I'm collecting info to put an OM617 in a Toyota Land Cruiser FJ40 (old body style).
RE: Runaway OM617 - Simpler=Better - 02-09-2012
Pull the ALDA and use your foot-it eliminates 500 miles of extra piping