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#1
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1971 OM616 fuel shutoff
Have a 1971 OM616.911 in a Unimog that doesn't want to shut off on its own.
Anyone familiar with this type/model? The IP is different than a 240D. Thanks, Dan |
#2
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well it is vacuum driven just like the rest I believe the part number is to be 0000702053 or 1427133091
Have you located the pull off valve?
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace |
#3
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No valve.
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#4
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well now it must be wired - that is indeed different
see this https://www.benzworld.org/threads/unimog-140l-2001-wont-start-off-key-have-to-cross-starter-to-fire-up.3072119/
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace |
#5
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Looks similar but not identical to a PES4M injection pump without the pneumatic governor. The lift pump isn't mounted to the injection pump. Where's the fuel to the injection pump coming from? Is the cut-off there?
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- Greg - 1973 220D, The Prodigal Benz 1974 240D |
#6
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No wires, no solenoids
Quote:
See attached photo, not greatest pic but best I find |
#7
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Here is, what I believe, the proper LP for my application.
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#8
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there use to be a unimog group , try a websearch for a forum or blog sorry could not be of more help
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace |
#9
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Asked one of the bigger unimog suppliers if there was a rebuild kit for the LP and was told only a updated primer. Was given that link to a complete LP. I've seen a few threads here showing new check valves available and wonder if they will work on my LP.
I'd go with a modern electric LP before spending $350 on a already obsolete PN. Same reason it's getting an electric fan, the fan support bearing is NLA too. |
#10
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Never been behind a unimog, but here it is :
-the dash throttle lever should be connected to the pedal linkage Check the connection, alter the length of the rod #48 by the ball sockets. Worn bushing(s) in the assembly would give you a sloppy feel and in your case the slop may be the reason for failing to achieve the "stop" point. Also pulling the gas pedal back may shut the engine off, so try this too. Check how operating the hand throttle affects the gas pedal position : https://youtu.be/dxJX8j4adD8?t=13 The repair kit for the lift pump should be available from Peachparts, #0015861207 https://mb-teilekatalog.info/view_SubGroupAction.php?lang=E&mode=BM&class=6&aggtyp=M&catalog=172&model=616911&group=07&subgrp=045 Please do NOT swap the LP for an electric one ! No need to buy a new one either. Pretty much everything concerning the injection system and the engine is covered almost completely in the forum, so search the archives (easy) or ask straight. |
#11
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Quote:
I was leaning towards adjusting #48 as well. Just didn't want to make an adjustment that did something negative inside the governor. Have already checked the hand throttle and lifted up on foot pedal, even tried physically pulling on the linkage of the pump. Yes, lots of archived information here. Just wasn't able to find much unimog stuff. Also realize I should have joined a LONG time ago seeing as how I missed out on using member greazzy(?) injection services. If I can fix the stock components at a reasonable cost I will but not spending $500 on a fuel system to feed a 52 hp engine. Just purchased a MB filter head from a unimog supplier at good price but need to drill and tap it for the recirculation banjo fitting. Apparently not all use that. EDIT: If the picture indicates #48 connects the hand throttle to the foot pedal, I don't have that. It's connected via a chain. Attached pic shows where my "#48" is
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1971 421, Unimog OM616 |
#12
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Here is a pic I found online with what appears to be my pump.
Black arrow should be WOT setting. Wondering if yellow circle would be mechanical fuel shut-off??? Now to check if my pump has that part in yellow.
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1971 421, Unimog OM616 |
#13
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So the dash throttle lever is connected to the pedal linkage via chain or wire.
The "Shutoff Stop" may not be external,like "the WOT/Full load Stop". Observe the movement of the control lever when you step on the gas pedal. When the ehgine is idling,disconnect the ball socket by the return spring (the yellow circled area on your pic) and move the lever further up,this "should" shut it off. Then modify the length of the lever to compensate for the lack of "travel". Blinking in front of the graphs the only thing that allows for adjustment is #48 (unless there are more levers not on the fig's). When you operate the hand throttle the revs change, don't they? And the only issue is that it fails to shut off? Using a small mirror helps a lot. Also it is advisable to have the IP(PES4M XXXRSXX) and lift pump(FP/K XXYXX) designations and that of the governor (RQ or RQV or whatever it is ). Clean the tabs on the resp. units and make photos for reference. Seems to be a common issue with mogs btw. https://www.steelsoldiers.com/threads/flu419-diesel-engine-does-not-shut-off.191784/ |
#14
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Quote:
-unfortunately the yellow circled 2nd valve does not exist on my pump. That would have been too easy. See attached pump pic -hand throttle works fine -plan on removing linkage at the ball joint and see if anything changes Quote:
LP data tag not readable anymore Quote:
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1971 421, Unimog OM616 |
#15
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Are these check valves (Part #: 000-090-02-10-MBZ) universal to the LP on all OM616/617s?
Looking into a new primer (Part #: 000-090-88-50-M14) as well.
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1971 421, Unimog OM616 |
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