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PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)
-   Diesel Discussion (http://www.peachparts.com/shopforum/diesel-discussion/)
-   -   Replacing Rack dampener pin (http://www.peachparts.com/shopforum/diesel-discussion/176580-replacing-rack-dampener-pin.html)

TheDon 06-08-2008 11:45 AM
Quote:
Originally Posted by dieseldan44 (Post 1391870)
You need a 14 mm and 16mm open end wrenches I believe.

-Get the car to hot idle, shut the car off.
-There is a locknut on the old pin. Loosen this a couple turns.
-With the wrench, and then your fingers unscrew the old rack damper pin. A valuable technique: Straddle the oil cooler line with your thumb and middle finger to make the turns. This makes the whole procedure SOOO much easier. I laughed a cosmic laugh when I realized this.
- Remove and observe.
-Take some of the oil off the old pin and put a little on the new gold pin.
-Screw pin into the IP until you feel a little resistance.
-Turn the car on.
-Now it's time to tweak. Back out the screw until the engine really lopes. You'll know when youre there.
-Now screw in a couple turns, to right after it stops loping. It will not get much smoother going in further, it supposedly will be harder to start.

This improved my hot idle quite a bit. I got a gold damper screw off a junkyard car. There's an article that ive probably paraphrased pretty much at mbz.org IIRC.

Good luck!
dd
I think I am screwed, mine will not turn by hand, even after seriously loosening the lock nut.

ForcedInduction 06-08-2008 12:07 PM
It won't because the o-ring is acting like a wedge in the threads.

TheDon 06-08-2008 12:30 PM
I've spent the last, what 20 minutes fumbling with it... no matter which way I go with the lame, short 12mm wrench, It will not back out...


I hate the rack dampner bolt... I can't get enough throw on the wrench to back it out at all.. Lowes didn't have a long enough 12 mm, they sold one that was shorter than the craftsman I already have! I'm not driving 45 minutes for a bloody wrench that sears probably wont be able to find for me. I'll have my mechanic do it.

ForcedInduction 06-08-2008 08:18 PM
Get a gear (ratchet) wrench for about $12. The 12mm gear wrench also makes changing glowplugs much easier.

TheDon 06-08-2008 08:21 PM
I got it out without the gear wrench, But I would like some in the usual sizes.

joro 06-30-2008 08:47 PM
can someone please post a picture of the rack dampner and where it is on the ip.
thanks

1983/300CD 06-30-2008 09:06 PM
Start looking in the space between the IP and the oil filter. It's screwed into the IP, in its rear. Can't miss it.

RML 07-01-2008 12:20 AM
Quote:
Originally Posted by Dewhite2485 (Post 1392288)
Im new to MB diesels, what is this pin what does it do, why does it cost so much and where is it
I was talking to the indy I go to when a job is over my head. He told me it controls the fuel pressure, and if I decide to play with it, mark where it was set so I can get it back there if needed. They set the pressure at the factory. From what I have read, the original pin had a weak spring and the replacement corrects that problem. So it sounds like if you are getting one from the junkyard, make sure it is the replacement. For the price, time invested in getting it from the junkyard, and risk of it being worn out, personally I would go with a new one. I have been burned too many times with trying to save a few bucks at the junkyard on a critical part. Heck, it costs less than a fillup now.

Here is one I found with some info: http://**************.com/search/node/rack+damper

If anyone has had problems with this parts source, please let me know. I looked at Fastlane's parts catalogue first but did not see it listed.

Diesel911 07-01-2008 01:45 AM
Quote:
Originally Posted by RML (Post 1898087)
I was talking to the indy I go to when a job is over my head. He told me it controls the fuel pressure, and if I decide to play with it, mark where it was set so I can get it back there if needed. They set the pressure at the factory. From what I have read, the original pin had a weak spring and the replacement corrects that problem. So it sounds like if you are getting one from the junkyard, make sure it is the replacement. For the price, time invested in getting it from the junkyard, and risk of it being worn out, personally I would go with a new one. I have been burned too many times with trying to save a few bucks at the junkyard on a critical part. Heck, it costs less than a fillup now.

Here is one I found with some info: http://**************.com/search/node/rack+damper

If anyone has had problems with this parts source, please let me know. I looked at Fastlane's parts catalogue first but did not see it listed.
Your Indy is not correct concerning the Rack Damper Bolt controlling the fuel pressure. The fuel injection pressure is controlled by the Pop Pressure of each of your injectors and the pressure from the Fuel Supply Pump is controlled by the Overflow valve on the side of the Fuel Injection Pump Housing.

RML 07-01-2008 06:52 AM
Quote:
Originally Posted by Diesel911 (Post 1898106)
Your Indy is not correct concerning the Rack Damper Bolt controlling the fuel pressure. The fuel injection pressure is controlled by the Pop Pressure of each of your injectors and the pressure from the Fuel Supply Pump is controlled by the Overflow valve on the side of the Fuel Injection Pump Housing.
Well, so much for his opinion. From the shape of it, like a needle valve, it looks like it would control flow of fuel somewhere along the path of fuel delivery.

ForcedInduction 07-01-2008 07:03 AM
The rack damper is exactly what its name suggests, it dampens the rack. Its a mini shock absorber that keeps the fuel rack from vibrating at idle and making the engine shake.

RML 07-01-2008 07:11 AM
Quote:
Originally Posted by ForcedInduction (Post 1898156)
The rack damper is exactly what its name suggests, it dampens the rack. Its a mini shock absorber that keeps the fuel rack from vibrating at idle and making the engine shake.
Thanks for the explanation, Forced. That certainly points to the Rack Damper as the culprit for why my engine shakes at idle. Sometimes it does, sometimes not.

joro 07-01-2008 10:34 AM
A nice big picture would help us newbies,and a part number too,thanks.

RML 07-01-2008 08:36 PM
Quote:
Originally Posted by joro (Post 1898314)
A nice big picture would help us newbies,and a part number too,thanks.
Try this link: http://www.peachparts.com/shopforum/attachments/diesel-discussion/42618d1174877713-so-what-does-rack-damper-bolt-617-actually-do-rack-damper-gold-silver.jpg

toomany MBZ 07-05-2008 05:40 PM
1 Attachment(s)
Try part # 0000742674.
In the pic, the top one, gold color, are the new ones, they have a stronger spring. It does not come with the lock nut, or "o" ring, the latter of which is not on either one.


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