weird 126 front end rattle
 

My 1989 300SE with 102,000 miles has developed an annoying and mystifying front-end rattle. The noise seems to come from the passenger side and is quite pronounced when first starting up. After a while, the rattle goes away. If the car sits for a while, say a half hour, and is then started up, the rattle comes again for a while when driven. Recently, after I had the car jacked up to change the steering damper, I noticed that the rattle was even worst after the car was lowered from being jacked up and driven.

This rattle happens when hitting a bump, and may be a bit more likely when turning, but the amazing thing is that it really does pretty much go away after a while.

The car has had its wheel bearings and races replaced about six months ago, and the brakes are in first-class shape. I think it's happening somewhere in the suspension or steering gear, but there is no discernible feeling of the rattle in the steering wheel. It's a very pronounced noise, not really deep and heavy, more plastic in nature.
Any help would be most appreciated. My mechanic friend says it was common for the 126 bodies to develop a bushing problem from the strut that attaches to the body and to the front suspension.
He is puzzled by the fact that my rattle goes away after a while.

Its a wild shot, but you might find it useful to get your mechanic to check on the tappets ... it could be. Like I said, a wild shot.

rattle
 

could it be the exhaust pipe or one of the heat sheilds? When my motor mounts collapse, the exhaust pipe starts to hit the frame with a bussing/rattle sound.

Look closly at the exaust pipe where it passes by the crossmember,as the engine mounts wear out the pipe comes in contact with the cross member.
ther is an aftermarket brand of mount on the market that is pure junk.the brand to avoid starts with the letter m
MF

thanks guys, but I changed the motor mounts about a year ago. I'll check the exhaust pipes and heat shield anyway.

I think they are on the right track suggesting the exhaust pipe. I runs very close to the steering gear and cross member.

Rattle
 

Check the mounts anyway! There were alot of aftermarket engine mounts sold last year that were junk right out of the package.
M.F.

Mine had a similar problem. It turn out to be the rubbers on the end of the sway bar. Crawl under and see if there is a slight gap between the rubber and steel. I did a foolish thing and squirted some lube on the rubber. Then I had the rattle all the time. Fixed now with acouple of $2 parts for fastr lane;)