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drinkypoo 08-25-2007 11:53 PM

Need body measurement info for W126 (300SD)
I have a crash-damaged W126 300SD (1981) and need the body measurement information. I can't find it on the W126 service manual CD. Does anyone by chance have a sheet or two on measurement? I only need to worry about the front end. I found the suspension measurement points but not the body ones.

myarmar 08-26-2007 12:39 PM

This info is here ... \program\Chassis\40-400.pdf on W126 CD1 or 2

drinkypoo 08-26-2007 01:01 PM

No, that information is not there. That information is only for checking the suspension measurements. That's why it's in the suspension section of the manual and why the service procedure inside of it is called "checking wheelbase and comparison measurements on front and rear axle". That does not provide any top-end body reference points. I need to measure points on the fenders and core support (both of which are definitely damaged.)

myarmar 08-26-2007 01:41 PM

1 Attachment(s)
OK, how about this WIS document. I don't think you'll find fender mounting points measurement. You most likely would have to compare with the other side or car.

drinkypoo 08-26-2007 04:59 PM

That's closer, but it's still not quite right. There is almost certainly an official diagram of the vehicle somewhere that is specifically intended for checking the (uni)body for straightness. These diagrams are simplified but have sufficient detail to point out measuring points intended for this purpose. They typically do involve the suspension peripherally, since places where suspension components mount to the unibody are often used as measuring points.

For example, on my 1989 Nissan 240SX, the innermost holes for the upper strut mount (part of the unibody) are referenced not only to each other, but also to the cowl and to the core support.

The core support measurements are among the most important in the vehicle because they inform the position of everything in the front end of the vehicle. And they are absolutely necessary because pretty much any significant damage to one side of the car is guaranteed to effect the other side in a unibody vehicle. This particular collision was front-end and it displaced BOTH sides of the core support and damaged both fenders - this is entirely typical of this type of accident and it is the reason why almost any car that has ever been involved in any kind of front-end collision that has required repair has poor fitment. Even running the bumper cover (in vehicles which have one) into too many curbs can cause this kind of damage, without actually cracking the bumper cover!

Anyway, moral of the story is that there is somewhere a document intended for this purpose. Measurements are included in collections possessed by auto body shops and if I am lucky I can get someone to fax me one Monday (or later.)

I am looking for something very much like the document you first suggested, but specifically applying to the unibody.

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