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#1
03-22-2007, 10:07 PM
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so, what does that rack damper bolt (617) actually do?
does it do more than simply adjust idle? what 'rack' does it adjust? how to make a 617 not shake at idle? is it possible??
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#2
03-22-2007, 11:27 PM
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It dampens the rack.
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#3
03-22-2007, 11:36 PM
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My best guess is that the rack is something inside the injection pump that controls how much fuel is injected, by dampening it, it cancels out the vibration of the engine from creating a resonating injection of fuel that makes the vibration worse, someone pleasr correct me if i'm wrong...
__________________
Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline!
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#4
03-22-2007, 11:38 PM
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As far as I understand that is correct.
I'm sure somebody who has commited the Bosch manual to memory will chime in soon. 
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#5
03-23-2007, 09:11 AM
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Was ist der rack?
I to - as a newbie - have wondered what the rack actually is. I asked the same question a while back and never got a posting that explained what the rack in the IP does.
There are lots of postings on how to adjust it, nothing on what you are actually changing by adjusting said bolt. My engine doesn't vibrate a lot at idle (certainly compared to the tractor  ) so I have never bothered to mess with it.
Last edited by 300sdToronto; 03-23-2007 at 09:13 AM. Reason: typo
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#6
03-23-2007, 02:26 PM
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Sorry I couldn't find a photo but here goes..........o o o o o.(the o's=valves & underline=rack)............The rack is a geared shaft in the IP that turns a tapered plunger in the fuel delivery valve to control the amount of fuel delivered with each stroke. When the rack returns to idle, the dampner cushions the return for a more gradual decrease at the very end of its travel.
__________________
Sam 84 300SD 350K+ miles ( Blue Belle )
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#7
03-23-2007, 03:35 PM
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Quote:
Here is the pics that your looking for.
__________________
1983 123.133 California - GreaseCar Veg System 
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#8
03-23-2007, 03:40 PM
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I have an IP completely dissasembled and that rack itself is pretty cool
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#9
03-23-2007, 07:45 PM
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truly great information there. so when I adjust the rack damper I'm not adjusting idle speed, just idle shakyness? what adjusts idle speed then?
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#10
03-23-2007, 07:47 PM
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There's an idle adjusting screw on the IP on the block side. It has a slotted head and a lock nut.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#11
03-24-2007, 03:27 PM
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Quote:
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#12
03-25-2007, 10:55 PM
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Here is a picture of the old silver damper and the new gold damper. (The blue lines in the picture are camera artifacts).
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#13
01-04-2010, 08:21 PM
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I do not know exactly what the rack dampner does...
but I know the MB engineers designed it so that future wear ( excess play ) could be ' taken out' by adjusting it..
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#14
04-04-2015, 04:56 AM
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Recycled
For new members.
.
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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