Hi I just purchased a 1983 W123 300D 99,600 miles, that has been sitting for awhile and i'm pretty new to the MB diesel scene, the car has no power it will not go past 30 MPH WOT on flat ground and it will shift very early to 3rd gear it will get pass 30 eventually and will rev and will buck (Starving for fuel?) and will not shift to 4th gear unless I let off then it will shift up bog and then it will shift back down.

It also have a very bad lope at idle i've read the rack dampener bolt is one of the things that might cause it? what size is it to tighten?

Things I have tried already.

Adjusting the ALDA (gained a little more bottom end)

Tightened down the wastegate. (Garret T3)

Checked all vacuum lines.

Adjusted the bowden cable.

Checked all the fluids, air filter etc fuel lines to the IP I noticed the prefilter was clogged.

Tomorrow I will be going to the parts store and grabbing a new pre filter and fuel filter, change the oil and see if that helps.

I've been researching a little and I've read a few threads and a few stated to remove the tank, clean it and clean the fuel tank strainer screen. Any special tools needed to remove the tank from the car?

I saw a few people remove the strainer with a special socket from Mercedes source, it it possible to remove the screen without the special socket?

Any things I should check and go over?

Thanks in advance.

Welcome to the forum

Do yourself a favour and stop adjusting things until you've got new fuel filters in place

Tank removal and cleaning is here as well as a description of the tank screen removal

PeachPartsWiki: 240D Fuel Tank Removal and Cleaning

http://www.peachparts.com/shopforum/diesel-discussion/199206-w123-fuel-tank-screen-replacement.html

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Thanks for the helpful links, Stretch.

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1983 300D OM617
2008 F-350 6.4 PS CCSB 4x4 DRW
2008 F-250 6.4 PS CCSB 4x4 SRW Billet BW S366

as described above...

after...check kick down switch....

cheers

.

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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered

If this car is new to you it is always advisable to set the valve lash so as to not take a chance on burning a valve.

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

The lack of power and speed sounds like the switchover valve. Either a vac line came off it or you might need a new one.

I'm going to bet accelerator pivot on firewall is broken...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Good advise so far, you say you adjusted the ALDA, have you confirmed the pressure line is clear and not compromised?

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83 SD

84 CD

As above, ensure you're getting to the throttle stop, adjust/lube/check linkage

I would skip pulling the tank until verifying that is a problem.

I would start by bypassing it -- try running the fuel lines to a 1 liter soda bottle or something filled with diesel and diesel purge and see if you are able to get it past 30mph.

If that doesn't work, your problem is likely not in the fuel system and I would start looking at linkages, throttle adjustment, accelerator pivot mount, valves, etc.

Dkr.

Yes sir also cleaned the banjo bolt on the rear of the intake manifold.

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1983 300D OM617
2008 F-350 6.4 PS CCSB 4x4 DRW
2008 F-250 6.4 PS CCSB 4x4 SRW Billet BW S366

Thanks all, for the great info, I will go and check the linkages etc and report back.

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1983 300D OM617
2008 F-350 6.4 PS CCSB 4x4 DRW
2008 F-250 6.4 PS CCSB 4x4 SRW Billet BW S366

Good, we look forward to hearing from you again.

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83 SD

84 CD