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  #1  
Old 05-04-2008, 10:42 AM
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300D slow on take off. Injectors? (Rebuild or Buy new.)

I never really thought much about it but after I picked up this 300SD I realize that something must be up with my 300D Turbo. The 300SD takes off like a banshee and the turbo whines so well it's great! But not so much on the 300D. I've been reading a lot lately about slow performance on take off and am considering either buying new injectors or rebuilding mine. I have done a lot of work to the 123 but it still takes off slow. At high RPM's on the highway it accelerates well. Also, I can never hear my Turbo whine. Here's what I do know:

1) Valves have been adjusted.
2) I am taking off in 1st.
3) The linkage looks good.
4) New air filter.

I have been reading a little bit about the ALDA but am still not too familiar with what it does or why and how to adjust it. Anything else I should consider related to getting better take off?

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  #2  
Old 05-04-2008, 02:08 PM
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The injectors are not your problem, but it never hurts to check them because I doubt any of the PO's did. Find a local diesel shop and have them tested, rebuild any that fail.

Low power can be a number of things, timing off, boost cut off line plugged, etc.
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  #3  
Old 05-04-2008, 03:28 PM
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If it is slow from idle to 2000 rpm adjust the Alda CCW.
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  #4  
Old 05-04-2008, 04:26 PM
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Alda. However new injector nozzles will improve off the line performance. But you need the alda adjusted, that is if you have severe turbo lag. In my cars after adjusting the alda its just a smooth, strong acceleration istead of a weak one until it hits 2300rpm
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  #5  
Old 05-04-2008, 05:24 PM
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Before adjusting the ALDA clean the Banjo bolts and make sure the hoses are clear and there are no creacked or disconected hoses.
How about your Fuel Injection Pump timing? Will WVO and biodiesel need different Fuel Injection Pump timint?
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  #6  
Old 05-06-2008, 09:19 PM
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Car ran slow before WVO conversion...Banjo bolt has been plugged. And the banjo bolt is plugged in the 300SD and it still runs great..And which hoses do I need to check for creaks or disconnections...Which timing can be off and how do I adjust it?
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  #7  
Old 05-07-2008, 01:37 AM
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Quote:
Originally Posted by veg_hed_300d View Post
Car ran slow before WVO conversion...Banjo bolt has been plugged. And the banjo bolt is plugged in the 300SD and it still runs great..And which hoses do I need to check for creaks or disconnections...Which timing can be off and how do I adjust it?
This pdf has how to do the factory type timing:
http://www.pauldrayton.com/uploadfiles/merc/Service/W123/Index/617T/07MechElec.html

Check some threads/posts concerning if the timing should be different with what you are using for fuel.
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Last edited by Diesel911; 05-07-2008 at 10:05 AM.
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  #8  
Old 05-08-2008, 09:33 PM
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Quote:
Originally Posted by Hatterasguy View Post
The injectors are not your problem, but it never hurts to check them because I doubt any of the PO's did. Find a local diesel shop and have them tested, rebuild any that fail.

Low power can be a number of things, timing off, boost cut off line plugged, etc.
Where is the boost cut off line?
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Old 05-08-2008, 09:39 PM
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Quote:
Originally Posted by veg_hed_300d View Post
Car ran slow before WVO conversion...Banjo bolt has been plugged. And the banjo bolt is plugged in the 300SD and it still runs great..And which hoses do I need to check for creaks or disconnections...Which timing can be off and how do I adjust it?
Thats not the banjo bolt they are talking about. There is a hard plastsic line that runs from the injection pump around the back of the engine to the exhaust manifold. On either end is a banjo bolt. They get clogged with soot, and cause slow take-offs. Try removing the line and cleaning the bolt, the banjo, and the hard line. Then see what happens. Do this before you mess with the ALDA. It made a huge difference in my wagon.
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  #10  
Old 09-18-2008, 10:57 PM
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Slow power

1984 300d turbo 147k
replace the fuel lift pump $152.32 new primer pump ASSEMBLY , 4 copper seals go to this site, fuel input RIGHT SIDE need 19 mm deep socket and 3 10 mm nuts use 10 mm deep socket left side or instaLL an electric fuel pump kit **************.com. $160.00 do not remove the primer hand pump install the left fuel plastic line the right side is fuel input at small filter for fuel in, now have good power, no smoke, less fuel, diy.

Last edited by RAYMOND485; 09-18-2008 at 11:09 PM.
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  #11  
Old 04-11-2009, 02:44 PM
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I'm resurrecting this because I haven't solved the problem in the last year since I posted it. I worked my arse off last summer then put the Benz in storage for 5 months while I moved. Got the Benz out last week and it continues to run great on the highway, however it still runs like a dog on take off. I have trouble getting up steep hills at low speeds even, this is really annoying...

So a recap:

1) Valves have been adjusted.
2) I am taking off in 1st.
3) The linkage looks good.
4) New air filter.

And I cleaned out the banjo bolts.

No noticeable increase in power. Is there a good DIY article on adjusting the ALDA? I don't even know where the thing is or what it looks like.
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  #12  
Old 04-11-2009, 06:01 PM
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The Banjo Bolt the previous posters were referring to is located at the rear of the Intake Manifold. A hard plastic line attached to the Banjo goes to a firewall mounted Over Boost Protection (on my '85 300D) Device. A line from the Over Boost device connects to the ALDA on top of the injector pump. Make sure the hollow fitting the Banjo is attached to is cleaned out. Also, check for leaks at the connections (banjo,ALDA,over boost). I'm thinking the problem is somewhere in that system.
Going a bit further, you might have a defective ALDA. The brass capsules inside are very delicate and adjustments done by a gorilla could be fatal, ie PO.
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  #13  
Old 04-11-2009, 07:16 PM
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[QUOTE=
Going a bit further, you might have a defective ALDA. The brass capsules inside are very delicate and adjustments done by a gorilla could be fatal, ie PO.[/QUOTE]

The ALDA seems to have never been adjusted. The reason I am saying this is because the plastic cap on top of the ALDA looks like it has never been messed with. Also, I cleaned out the line from the Turbo to the IP. I'll check the other lines as well...
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  #14  
Old 04-12-2009, 05:15 AM
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Have you considered turbo waste gate bleed pressure? I adjusted mine some time ago to release at higher pressure and later thought that I lost some of the low rpm acceleration (and got more solid top end). Granted I've messed with pump timing and ALDA as well but would venture to say that lower bleed point gives more "usable" power. I haven't gotten around to adjusting it back down but will do that this summer to see if that will do the trick. Just a thought...
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  #15  
Old 04-12-2009, 06:26 AM
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Just a wild idea....

How is the acceleration from say, 30 to 60?--Is it comparable to the other car?

If so, it could be the torque-converter. The Stator one-way clutch inside the converter will slip, give low stall-speed test and slow off the mark...

Had this on a different car, but the principle is the same. Worth checking stall-speed....

(Everyone jumps on the Turbo, Injectors, ALDA etc, when often the fault isnt any of those things...)

Logical diagnosis is needed with faults like this.....

When were the fuel-filters (Both) replaced?

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