Hey Guys, I've got a really wierd episode here...

After much research on this forum (thanks so much) on rough ile, I concluded that my problem was the Rack Dampneer bolt and worn Moter mounds!

I adjusted the bolt and the engine smoothed out beautifully. Then I proceeded to change the motor mounts. Boy were they worn. I am almost positive that these were never replaced. Anyway, I I changed them and boy does she idle beautifully now.

Now to the wierd part. I went out the bank yesterday, and as I am waiting in line at the drive-thru windows, the car starts shaking side to side.

So I got home, popped the hood, and found the monts were cracked . I took some pictures for you to see. Is this normal or is somethin else wrong that I missed. The engine shocks by the way seemed to be Ok. They had real good tension when I took them off the frame to get the engine jacked up!

Let me know what you think!

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Robert Ayala

1985 300SD (W126) 300K miles

Not real clear that the new mounts are torn? Those ripples on the sides of the rubber are common. What would be a real concern is a tear through the soft black material.
The shaking side to side is either (1) a bit of crap got into an injector, or (2) you over adjusted the rack damber bolt. If the latter was the case, you will notice the engine will shake or will act up after running it up and letting off the throttle. If it is seriously over adjusted it will die with the same run up.
Maybe just follow up the work with a diesel purge session.

I Don't know if it helped, but right after I adjusted the rack dampner, I poured a bottle of Redline's diesel catalyst. Would that help? Moreover, I have a new Rack dampner bolt coming by mail. I'll have to see what that does!

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Robert Ayala

1985 300SD (W126) 300K miles

You should get a can of diesel purge and follow the directions carefully. Basically you run it full strength through the fuel filler and into the IP, with the fuel return line running back into the container, until the entire can has been used. I do this once a year with both of mine and they always show substantial improvement after the purge. Just using fuel additives is not nearly as effective.
Don't get oversold on that damper bolt. If it is set right and is doing what it is supposed to, that problem is solved, until the bolt gets worn futher. You already said the engine smoothed out when you set it. That is a very good result. There are a host of other things that will make these old diesels shake and so on. Just solve one at a time.

Sounds like really good advise to me. Thanks!! Would you recommend a good brand of diesel purge. I've never done this before so any recommendations will be great!

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Robert Ayala

1985 300SD (W126) 300K miles

Diesel Purge is the brand. Go on google and you should be able to find it as cheap as about $6 a can.
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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I think he might be referring to "Diesel Purge," from LubroMoly. I ordered some recently from E.T.Y. Parts, based on a suggestion from someone else on the forum (sorry, I don't have the time to search so as to give him credit). I paid $7 per can for a quantity of 5 cans, and shipping seemed reasonable.

Search the forum on "diesel purge", and you'll find plenty.