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  #1  
Old 11-15-2022, 12:26 AM
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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

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  #2  
Old 11-15-2022, 10:29 AM
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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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  #3  
Old 11-15-2022, 11:57 AM
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Quote:
Originally Posted by meltedpanda View Post
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?
No valve.
Attached Thumbnails
1971 OM616 fuel shutoff-ip.jpg  
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  #4  
Old 11-15-2022, 05:12 PM
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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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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
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  #5  
Old 11-15-2022, 07:21 PM
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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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  #6  
Old 11-16-2022, 12:55 AM
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Quote:
Originally Posted by meltedpanda View Post
well now it must be wired - that is indeed different
No wires, no solenoids


Quote:
Originally Posted by gmog220d View Post
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?
LP is run off the front of the IP drive gear. No shutoff there either.
See attached photo, not greatest pic but best I find
Attached Thumbnails
1971 OM616 fuel shutoff-engine.png  
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  #7  
Old 11-16-2022, 01:00 AM
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Quote:
Originally Posted by gmog220d View Post
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?
Here is, what I believe, the proper LP for my application.
Attached Thumbnails
1971 OM616 fuel shutoff-lp.png  
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  #8  
Old 11-16-2022, 10:19 AM
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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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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
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  #9  
Old 11-16-2022, 11:14 AM
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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.
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  #10  
Old 11-17-2022, 08:04 PM
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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.
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  #11  
Old 11-18-2022, 11:24 AM
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Quote:
Originally Posted by vox_incognita View Post
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.


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.
Thanks for the links.
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
Attached Thumbnails
1971 OM616 fuel shutoff-ip2.jpeg  
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  #12  
Old 11-18-2022, 11:35 AM
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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.
Attached Thumbnails
1971 OM616 fuel shutoff-ip4.png  
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  #13  
Old 11-18-2022, 06:54 PM
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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/
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  #14  
Old 11-19-2022, 12:41 AM
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Quote:
Originally Posted by vox_incognita View Post
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?
-yes, hand throttle via chain
-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:
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.
Attached pump IP#s
LP data tag not readable anymore

The FLU419 is a different beast but the pumps look similar.
Attached Thumbnails
1971 OM616 fuel shutoff-ip7.jpeg   1971 OM616 fuel shutoff-ip8.jpeg  
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  #15  
Old 11-19-2022, 01:17 AM
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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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