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#2
01-11-2011, 01:45 AM
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When does it shake?
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Cheers! Scott McPhee 1987 300D 
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#3
01-11-2011, 01:51 AM
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Intermittent air leak on the suction side of the fuel system can cause this - somewhere before the fuel pump.
The primer pump is common spot for this to occur on the 616/617. I dont know your engine specifically.
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------------------------------- '85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit) '82 300D, 'Tex', 228k body / 170k engine ... summer car '83 300TD Cali Wagon 210k, wife's car
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#4
01-11-2011, 03:54 AM
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Answer
Here are the most common issues:
Why do I have vacuum in my diesel tank.....................? Why do I have vacuum in my diesel tank.....................? ********************************* Leaking rubber hose between fuel tank and lift pump = random sucking air. ********************************* O-ring, screw on fuel filter bolt MB# 0099978148 O-ring, screw on fuel filter bolt MB# 0099979248 DIY LINK: 300SD Fuel Filter Replacement Instructions 300SD Fuel Filter Replacement Instructions ***************************** 6050780581 diesel Looped Fuel Return Hose, one meter 6050780581 diesel Looped Fuel Return Hose, one meter DIY LINK: Braided fuel lines weep. 1984 300TD turbo Braided fuel lines weep. 1984 300TD turbo ***************************** OM601.921 Plastic fuel lines, injection pump, OM601.921 Plastic fuel lines, injection pump, ******************************* Diesel fuel thermostat repair kit, huge application list http://www.peachparts.com/shopforum/showthread.php?t=289787 ************************************ 1984 Mercedes 190D Delivery Valve O-Ring Diesel Injection MB# 0179974148 http://catalog.peachparts.com/item.wws?sku=0179974148 1984 Mercedes 190D Pressure Valve Seal Diesel Injection MB# 0019973440 http://catalog.peachparts.com/item.wws?sku=0019973440 DIY LINK: OM60_series IP delivery valve reseal OM60_series IP delivery valve reseal ********************************* Partially plugged fuel tank screen. Fuel tank strainer MB# 1244700106 DIY LINKS: Emptying the fuel tank Emptying the fuel tank MB diesel filtration, how it works. http://www.peachparts.com/shopforum/diesel-discussion/141211-mb-diesel-filtration-how-works.html#post1055075 fuel filter change http://www.peachparts.com/shopforum/diesel-discussion/112664-fuel-filter-change-post824006.html Diesel filters, no tank strainers please. http://www.peachparts.com/shopforum/diesel-discussion/140349-diesel-filters-no-tank-strainers-please-post1046422.html?posted=1 Primary filter melted by biodiesel? Primary filter melted by biodiesel? I'm baffled and at wit's end!?!?!?!?! I'm baffled and at wit's end!?!?!?!?! Algae/Fungus fixation... Algae/Fungus fixation... Biobor, what is it, why do I need it??? http://www.peachparts.com/shopforum/diesel-discussion/105304-biobor-what-why-do-i-need.html#post723857 Filters, Fungus, Biocide, etc. http://www.peachparts.com/shopforum/diesel-discussion/115952-filters-fungus-biocide-etc-post823378.html Algae Clogged Filter Pic StarTron WORKS ! Algae Clogged Filter Pic StarTron WORKS ! 240D fuel tank removal and cleaning Good for any W123 sedan. http://www.peachparts.com/shopforum/diesel-discussion/92826-240d-fuel-tank-removal-cleaning-post813925.html Check out this fuel pickup screen Check out this fuel pickup screen W123 Fuel Tank Screen Replacement W123 Fuel Tank Screen Replacement .
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ASE Master Mechanic https://whunter.carrd.co/ 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 2003 Volvo V70 https://www.boldegoist.com/
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#6
01-13-2011, 12:28 AM
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I would say change filters first, then look for an air leak.
Mine is doing this right now. I take a hwy to work that is 65mph with stop lights interspersed on it. After getting up to 65 (or more) and then needing to stop suddenly for a light, I'll start rocking for a bit, then it will calm down. inline filter has a few pieces of junk in it and I'm assuming the spin-on has even more fine stuff in it. It's on my list of things to do when I take a week off at the end of the month. Betty needs to be sent to the scrap yard and Puff needs some maintenance items done.
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'85 300TD "Puff The Magic Wagon" - Rolling Resto '19 Mazda CX-9 Signature - Wife's sled '21 Morgan 3-Wheeler P101 Edition '95 E300d - SOLD '84 300TD "Brown Betty" - Miss this one '81 240D "China Baby" - Farm grocery getter
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#7
01-13-2011, 12:32 AM
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Interesting that no one has mentioned engine mounts! My 87 Wagon shook at idle but once rpms were up a bit, it was fine. Installed new motor mounts and viola!
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1987 300TDT - 195,000 (Original #14 head) 1993 190E 2.3 - 105,000 1981 300D - 250,000
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#8
01-13-2011, 12:36 AM
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Bad motor mounts just make the fuel problem more obvious.
New motor mounts will hold a rocking engine fairly well, for a time. The goal is to resolve what is causing the engine to become unbalanced, in this case appears to be a fueling issue.
__________________
'85 300TD "Puff The Magic Wagon" - Rolling Resto '19 Mazda CX-9 Signature - Wife's sled '21 Morgan 3-Wheeler P101 Edition '95 E300d - SOLD '84 300TD "Brown Betty" - Miss this one '81 240D "China Baby" - Farm grocery getter
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#9
01-13-2011, 12:33 PM
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Mine is the same ,Ive got one side needing an engine mount bad.Look down at the motor mount while idleing ,if its moving uncontrolable ,its the that mount.
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