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#17
11-06-2012, 12:49 AM
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Answer #3
Fuel feed pressure, supplying the delivery valves is critical at high RPM, it can drastically reduce top speed.
Fuel injection pump starvation with a good lift pump Fuel injection pump starvation with a good lift pump - PeachParts Mercedes ShopForum Fuel pressure relief valve adjustment Fuel pressure relief valve adjustment - PeachParts Mercedes ShopForum lift pump test 1979 300td -- Can anybody walk me through a lift pump test? - PeachParts Mercedes ShopForum fuel pressure fuel pressure - PeachParts Mercedes ShopForum Here's my payback! Diesel Primer Pump Replacement Here's my payback! Diesel Primer Pump Replacement - PeachParts Mercedes ShopForum Injectors and Glow Plugs for Dummies Glow Plugs Bad......how to tell ? Inline diesel Injection Pumps FYI: Inline diesel Injection Pumps - PeachParts Mercedes ShopForum Fuel injection pump diagrams??? Fuel injection pump diagrams??? - PeachParts Mercedes ShopForum great internal injection pump pictures injection pump sluggish? Italian Tune up Italian Tune-up links thread - PeachParts Mercedes ShopForum Diesel Injection Pump TIMING thread Diesel Injection Pump TIMING thread ALDA issue threads ALDA issue threads - PeachParts Mercedes ShopForum Injector + Heat shield + Nozzle, Prechamber + Collar and Nailing. LINK THREAD Injector + Heat shield + Nozzle, Prechamber + Collar, and Nailing. LINK THREAD - PeachParts Mercedes ShopForum Ip rack return spring r&r Ip rack return spring r&r - PeachParts Mercedes ShopForum Diesel Timing Chain Link Thread Diesel Timing Chain Thread - PeachParts Mercedes ShopForum The rack damper bolt was superseded due to a weak spring failing. If it does not have the update, it needs it. so, what does that rack damper bolt (617) actually do? so, what does that rack damper bolt (617) actually do? - PeachParts Mercedes ShopForum Part# rack damper pin for 1985 300SD Part# rack damper pin for 1985 300SD - PeachParts Mercedes ShopForum Adjusting the Rack Damper Bolt Adjusting the Rack Damper Bolt Replacing Rack dampener pin Replacing Rack dampener pin - PeachParts Mercedes ShopForum Good information to know. Run away diesel, why does it happen? Run away diesel, why does it happen? - PeachParts Mercedes ShopForum Home Made Special Tools, This is where members can share how they made special tools Home Made Special Tools, This is where members can share how they made special tools DIY Adjust the base idle OM615, 616, 617 DIY Adjust the base idle OM615, 616, 617 .
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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/ Last edited by whunter; 11-06-2012 at 01:34 AM. 
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#18
11-06-2012, 12:49 AM
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Answer #4
Brake:
You would be shocked at how often I find: * Rear caliper inboard pistons fail to return = drag. * Brake hose internal damage. * Brake pads seized in the caliper frame = drag or no response. * Marginal or bad wheel bearing, (mostly front). * Wrong size tires, (cheap under size). * Bad wheel alignment. Brake: .
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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/ Last edited by whunter; 11-06-2012 at 01:09 AM.
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#19
11-06-2012, 07:15 AM
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Thanks whunter That is a lot of material to digest. I am starting with the basics of getting the vehicle maintained and working toward other repairs. I get maybe one day every week or two to work on it in my heated shop.
I have been poking around asking about a boost gauge installation, boost gauge installation. Have seen bits and pieces of the factory workshop manual pop up here. I followed a link to it and went to disc 2 and only to find the material missing in the folders. I am reading about 3-4 hours for every hour of actual maintenance. This is my third turbo vehicle and second turbo diesel. My 1.6 IDI TD VW has a lot more low to mid range acceleration at present so I know my Merc needs something done to it. This helps.
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#20
11-06-2012, 10:23 AM
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The car rolls very well in neutral although it slows down pretty quick in gear. I have had the rear wheels off the ground to check out the sway bar links and the wheels turn pretty normally.
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#21
11-06-2012, 10:59 AM
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FYI
Quote:
.
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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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#22
11-06-2012, 11:57 AM
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For more information about rebuilding injectors, see my signature.
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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#23
11-06-2012, 03:51 PM
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thanks whunter and eatont
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#24
11-06-2012, 05:20 PM
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I would give it a full service, to include Valve-Clearances and checking/setting injection-timing.
At the same time assess the wear/stretch of the timing-chain. I VERY much doubt the injectors will be 'holding you back' Diesel owners seem overly 'obsessed' by injectors.....  Ive found that the 617 'likes' a couple of degrees More advance--say, 2 to 3 degrees more, ie-- instead of say 24 deg, I go 26-27 degrees--especially running blends of methyl-esters... I had 110 mph out of an old, very rotten 300D n/a that had 150K on the clock, but had the above done.... 
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http://i190.photobucket.com/albums/z...0TDnoplate.jpg Alastair AKA H.C.II South Wales, U.K. based member W123, 1985 300TD Wagon, 256K, -Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.  W114, 1975 280E Custard Yellow, -Great above decks needs chassis welding--Really will do it this year....
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#25
11-07-2012, 12:55 PM
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Anybody have the drag coefficient of a W116??? I am wondering if 140 is possible with the 2.47:1 swap......I can get 120-125 out of it right now with the 3.07:1 axle @ 5000 rpm.
With the 215/70R14's and 2.47:1 axle, not accounting for converter slippage or other variables, 140 mph would come in at 4500 rpm...
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 Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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#26
11-08-2012, 10:28 PM
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I put in a new air filter before a road trip. Seemed to run quieter and have better part throttle response but no better on top. The old filter was a mess.
 Just had to try it, zoom zoom!
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#27
11-09-2012, 10:01 AM
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Quote:
cheers ChO .
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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blindednext wish/project: w114 coupe OM603 powered
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#28
11-09-2012, 07:17 PM
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I got the fuel filters in.
The Pre filter was not as pristine as I once thought. Here it isI compared it directly to a new one.  Also noticed that linkage would not open all the way like many said. Was 8-10 mm shy of the stop screw. Also has new oils in the engine and transmission. I think it is peppier. Still want to do the valve adjustment. A friend has an extra set of wrenches and an extra valve cover gasket.
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#29
11-09-2012, 07:27 PM
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Oh I also did an "injector cleaning by using straight diesel fuel injection cleaner in a pop bottle. After I was finished there was a fair amount of debris and discoloration in the bottle.
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#30
11-09-2012, 09:51 PM
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Oh once I changed the spin on filter it wouldn't start. I figured out how to run the primer pump (unscrew the white knob then work it in and out) by hand and with my wife cranking it started within a few seconds.
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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