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#1
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WVO, ran very well when parked....
Hi all!
Finally getting around to pulling the OM617 out of the rustmonster '85 300D. The car had been run on WVO, apparently, and when I disconnected the line to the (added, Fram) pre-prefilter, out came yummy-smelling syrup. I definitely don't want to damage this engine, as it ran very well when purchased, and is intended to be the "new" motor in my pickup truck. I did some searching and reading. The best summary thread I found was Saving WVO orphan! Input? which gives a number of options for cleaning the terminal fuel delivery system. I note that biodiesel seems to be a good system solvent/cleaner, something that won't damage components, and will dissolve WVO deposits. I also like the idea of biodiesel not smelling the place up as badly as diesel, and not being and harsh/dangerous/explosive as a lot of the alternatives. My goal is to disturb the engine as little as possible, as it's not (yet) a leaker. My thoughts so far: Remove everything up to the lines to/from the lift pump. Manually flush from a fresh batch of biodiesel until clean fuel comes out of the relief valve. Detach the hard lines at the injectors and repeat the flushing process until those all flow clean also. Remove and rebuild the lift pump. Reinstall, and see if the motor will start on biodiesel. So, what am I getting wrong here? Also, how many gallons should my "coolant system" be for test running a cradle-mounted engine? I'll be using water and Redline additive. Anything else I need to know up front? |
#2
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Flushing the system with biodiesel may or may not work as it may take time to dissolve deposits inside of the fuel injection pump and injectors.
Flushing the fuel system does nothing for sticking piston rings. Perhaps you need to dump something inside of the cylinders to soak and soften any stuff between the rings. When you are done crank the engine without the Glow Plugs or the injectors to get rid of any excess fluid pooled in the recess in the pistons. Change the oil before running as what ever you dump into the cylinders is going to run passed the piston ring gaps and into the crankcase.
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84 300D, 82 Volvo 244Gl Diesel |
#3
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You didn't mention how long the car sat. You may be replacing the injectors and injection pump. WVO doesn't lend itself to engine longevity, especially when parked or neglected. If it sat long enough, it's turned to glue and everything in the injection pump will be junk.
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#4
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Good luck
I ended up having to get a different injection pump for mine. The OM617 I rebuilt came with an injection pump that had been sitting with veggie oil for a while. I cleaned it as much as I could, ran biodiesel through it, did diesel purge, ran seafoam through it...nothing would help it. I would not get fuel at at least one cylinder when idling with the old pump.
The new pump I installed made all the difference in the world. The car is runs 100% better.
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Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver) Instagram: @maximed93 |
#5
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This discussion seems to lend to a more inferential question: If you are running WVO and decide to park the car, how much fuel do you need to run through it to clean out the injection pump? Or is there a different treatment that would de-gunk it well before it's too late? Or perhaps, does the WVO work its way into enough nooks that it's futile?
-Henry |
#6
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Quote:
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#7
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You could have a larger issue in general. Any WVO that has deposited in the piston ring land area will turn into a glue and stick the rings. If the engine is out of service for a long time. This may or may not have to be addressed. There are two potential problems in the injection pump. It is worn from WVO use or the moisture content of the WVO was too high. Neither are certainties.
So how long did the engine sit unused? Last edited by barry12345; 01-30-2020 at 05:12 PM. |
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