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#1
05-24-2022, 01:11 AM
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Uneven engine operation.
Hi all!
I overhauled the D24T. -put new sleeves, squandered -installed new Kolbenschmidt pistons -installed new valves, ground them After repair, the motor, during operation, sways at a certain speed. I want to record a video of his work. Post it here so we can diagnose. But I don't speak English and I won't be able to comment on the video IMG_20220411_160326.jpg Last edited by samvear; 05-25-2022 at 12:45 PM. 
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#2
05-24-2022, 08:08 AM
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Welcome!
Looks like very nice work you did on the engine. Uneven engine speed is often caused by air getting into the fuel system. Are there any places where air could be getting sucked in, for example near the fuel filter? Is the fuel filter installed tight and does not have a doubled up inner O-ring causing it to not seat the outer O-ring? Can you see any air bubbles moving in the translucent hose from the fuel filter mount up to the injection pump? Do you smell diesel fuel under the hood anywhere? Any difficulty starting the engine if the car has been parked facing uphill? Those are also common signs of air leaking into the system. Does the uneven operation happen all the time or just when the engine is cold? If you are sure there is no air getting in, then the next place to look would probably be to double check injection timing and some other possibilities.
__________________
86 745 D24T/ZF 345k lifted 2.5" 83 764 D24T/M46 155k
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#3
05-24-2022, 08:24 AM
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Thank you very much for your quick response and detailed tips.
Quote:
 I couldn't take a video or photo today. Because we are at war. Tomorrow I will definitely record a video of how the motor works and show you. Then you will understand what is the reason and you can tell me. Thanks again! See you tomorrow... IMG_20211001_232630[1].jpg IMG_20211001_232656[1].jpg Last edited by samvear; 05-25-2022 at 12:44 PM.
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#4
05-25-2022, 11:13 AM
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Hello.
Managed to make a video. But after uploading to YouTube, the quality was lost. I look forward to your comments after viewing. If something needs to be changed or added, please let me know. https://youtu.be/BIL1OrFaprQ IMG_20220525_151407.jpg IMG_20220525_151421.jpg IMG_20220525_151440.jpg I answer your questions Quote:
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I look forward to further advice from you. Last edited by samvear; 05-25-2022 at 12:46 PM.
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#5
05-28-2022, 05:53 PM
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Very nice looking car in your photos. And yes, hope you and your family are in a safe place from the violence in Ukraine. We in the US have been paying close attention to the war there and are inspired by your country's efforts.
After watching the video, it's hard to tell exactly what the engine is doing but I think I can see and hear the uneven operation you are describing. It sounds to me like the injection pump timing may be set incorrectly. What was the timing value (mm) that you set the injection pump to? And, did you remember to disconnect the cold start device cable when setting the timing? Easy to forget this, and if you do, it results in retarded injection timing that leads to issues like what you are seeing. It sounds like it starts right away so I agree you can probably rule out air in the fuel. Looks like you did very nice and clean work and I am sure it will run great once you find the issue.
__________________
86 745 D24T/ZF 345k lifted 2.5" 83 764 D24T/M46 155k
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#6
05-30-2022, 11:31 PM
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Quote:
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With a smaller value, the motor runs softer. With a larger value - works hard. However - at any value, the motor staggers at about 1400 rpm. Quote:
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Perhaps somewhere there is a video on how this motor should work correctly ... I have nothing to compare with.
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#7
06-09-2022, 06:06 AM
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Watched the video, sounds/looks like an intermittent miss to me. The engine shakes more than it should, especially at idle. Have you tried cracking one injector line at a time to see if you can narrow it down to a certain cylinder that isn't firing correctly? Could have an injector nozzle hanging up. I'd also run a piece of clear hose for the fuel return from the pump/injectors and see if you're getting any air bubbles. You can have air pushed into the injection pump from a fualty injector which will really screw up how it runs... Ask me how I know! If you don't see any air, but can narrow it down to a particular cylinder, I'd do a leak down test of that cylinder, and depending on your findings, I'd swap injectors from one cylinder to another and see if you mis-fire follows the injector.
Jason
__________________
  Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics!
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#8
06-12-2022, 04:11 AM
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Thank you Jason for your input. I am very glad for your help.
I will answer your questions Quote:
Unable to identify a cylinder that is not performing well. Quote:
All injectors were tested on the stand. The high pressure pump is also tuned.
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#9
06-12-2022, 06:28 AM
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Do you have access to another known good injection pump? I think at this point I would swap it for another pne and try it.
Jason
__________________
Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics!
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#10
06-12-2022, 08:53 AM
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Quote:
Do you still think it's the pump? In the same way, the motor worked with the previous pump. before pump repair. Repair of the pump did not give any result.
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Linear Mode
