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  #1  
Old 03-20-2005, 08:36 PM
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Join Date: Oct 2004
Location: Oakville Ontario Canada
Posts: 107
A Thanks of gratitude to the MB Forum

I would like to offer my sincere thanks of gratitude to this forum for the awesome help I have been able to find here, especially to the senior members who's posts have guided me in fixing my 1984 300D T.

I have not asked a single question and have been able to find most problems through the search. Fixes done include - ALDA, purging, vacuum, glow plugs, CV boot, seat repair, brakes, transmission modulator and more.

The car is almost perfect, but I have 2 minor issues to still resolve and ask for some guidance:

Q1
When taking off fast from a start, the transmission shifts smoothly through all gears, with only a slightly harder shift into 4th.

When taking off slowly, there is a noticably harder shift 1 to 4 with a noticable clunk inth 4th. I adjusted the modulator valve on the transmission about a quarter turn CCW. Where else should I look?


Q2
When driving highway speed (60) the car drifts slightly - left, then right. Wheels were aligned, steering box tightened, and the car drives straight at lower speeds. Is it a worn part?

Thanks again for your skills and knowledge.

Wally

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Old 03-20-2005, 08:56 PM
WANT '71 280SEL's Avatar
I'll Go Upside Your Head!
 
Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
You need to get the front of the car off the ground onto jackstands so that the wheels are free. Then, grab the wheels and try to shake them back and forth. If there is any movement or any noises, track them. They will probably move some at the steering box which is natural to an extent, but a rebuilt box is around $600 I think, so live with it (unless you have deep pockets of course). See if the idler arm moves up and down at all. See that the tie-rods don't have any play. Did they mention anything after the alignment about front-end parts that might be worn out? Also, look into front and rear subframe bushings. I heard whunter had a similar problem with his 300SD and it was solves by rear subframe bushings. You really need to just have a look underneath the car and see what bushings/joints are worn out.

Thanks
David
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  #3  
Old 03-20-2005, 09:01 PM
lietuviai's Avatar
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Join Date: Mar 2003
Location: SW WA
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Check the upper control arm bushings and see if they're squished or cracked. They can cause some drifting problems.
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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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  #4  
Old 03-21-2005, 08:24 PM
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Join Date: Oct 2004
Location: Oakville Ontario Canada
Posts: 107
Thanks again to the form, I found a post (2003) relating to my problem with subtle steering drift. The problem was that in adjusting the steering box, I did not leave enough play in the steering. This caused the steering to be stiff and at highway speeds, did a subtle drift, side to side. Adjusted it back a little today and it is now good.

The challenge with searching the forum, is that there are so many posts resulting from a search and it takes a while to look for the right answers.

So I'm down to the final question relating to the transmisson - smooth shifts with fast starts, and harder shifts with slower acceleration, Any ideas here?

Could my vacuum be low?
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  #5  
Old 03-21-2005, 08:38 PM
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Join Date: Nov 2002
Location: Milford, CT
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When my car had a worn tie rod end it would drift a bit on the highway. I replaced both tire rods, the center link, and rebuilt the idler arm. It is money well spent and should tighten up your steering.

As to the gear box I found one with a lot less play in my parts car. It has about 70k less miles on it. But in another year or so I will bend over for a rebuilt one, I hate any steering play.
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  #6  
Old 03-22-2005, 09:30 AM
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Join Date: May 2002
Location: Central Oregon
Posts: 1,004
check the vacuum at the tranny vacuum line

Remove teh line at the IP bleed valve that goes to your transmission and check the vacuum there at idle. Then move the throttle slowly and seeif the vacuum adjusts according to throttle movement.
I found that many of these cars have a problem with the vacuum valves that drive the egr valve (the ones on top of the valve cover) and when even a sligth amount of throttle is applied all vacuum is lost.

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